[Intel-gfx] [PATCH 3/8] drm/i915/display: Move DRRS code its own file
Jani Nikula
jani.nikula at intel.com
Wed Aug 18 07:24:39 UTC 2021
On Tue, 17 Aug 2021, José Roberto de Souza <jose.souza at intel.com> wrote:
> intel_dp.c is a 5k lines monster, so moving DRRS out of it to reduce
> some lines from it.
The functions in a file should be named after the file prefix,
i.e. intel_drrs_*() here. The renames don't need to be in the same
patch, but I think we need to have them. (Probably should be a separate
patch to keep the code movement easier to review.)
BR,
Jani.
>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
> Documentation/gpu/i915.rst | 14 +-
> drivers/gpu/drm/i915/Makefile | 1 +
> drivers/gpu/drm/i915/display/intel_ddi.c | 1 +
> .../drm/i915/display/intel_display_debugfs.c | 1 +
> drivers/gpu/drm/i915/display/intel_dp.c | 467 +----------------
> drivers/gpu/drm/i915/display/intel_dp.h | 11 -
> drivers/gpu/drm/i915/display/intel_drrs.c | 477 ++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_drrs.h | 32 ++
> .../gpu/drm/i915/display/intel_frontbuffer.c | 1 +
> 9 files changed, 521 insertions(+), 484 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/display/intel_drrs.c
> create mode 100644 drivers/gpu/drm/i915/display/intel_drrs.h
>
> diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
> index 204ebdaadb45a..03021dfa0dd81 100644
> --- a/Documentation/gpu/i915.rst
> +++ b/Documentation/gpu/i915.rst
> @@ -183,25 +183,25 @@ Frame Buffer Compression (FBC)
> Display Refresh Rate Switching (DRRS)
> -------------------------------------
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :doc: Display Refresh Rate Switching (DRRS)
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :functions: intel_dp_set_drrs_state
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :functions: intel_edp_drrs_enable
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :functions: intel_edp_drrs_disable
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :functions: intel_edp_drrs_invalidate
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :functions: intel_edp_drrs_flush
>
> -.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp.c
> +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
> :functions: intel_dp_drrs_init
>
> DPIO
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 642a5b5a1b81c..c7cf4dfdc6379 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -212,6 +212,7 @@ i915-y += \
> display/intel_dpio_phy.o \
> display/intel_dpll.o \
> display/intel_dpll_mgr.o \
> + display/intel_drrs.o \
> display/intel_dsb.o \
> display/intel_fb.o \
> display/intel_fbc.o \
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 1ef7a65feb660..828df570a4809 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -40,6 +40,7 @@
> #include "intel_dp_link_training.h"
> #include "intel_dp_mst.h"
> #include "intel_dpio_phy.h"
> +#include "intel_drrs.h"
> #include "intel_dsi.h"
> #include "intel_fdi.h"
> #include "intel_fifo_underrun.h"
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index 8fdacb252bb19..b136a0fc0963b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -13,6 +13,7 @@
> #include "intel_display_types.h"
> #include "intel_dmc.h"
> #include "intel_dp.h"
> +#include "intel_drrs.h"
> #include "intel_fbc.h"
> #include "intel_hdcp.h"
> #include "intel_hdmi.h"
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 75d4ebc669411..10583b0aa489e 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -55,6 +55,7 @@
> #include "intel_dp_mst.h"
> #include "intel_dpio_phy.h"
> #include "intel_dpll.h"
> +#include "intel_drrs.h"
> #include "intel_fifo_underrun.h"
> #include "intel_hdcp.h"
> #include "intel_hdmi.h"
> @@ -1603,46 +1604,6 @@ intel_dp_compute_hdr_metadata_infoframe_sdp(struct intel_dp *intel_dp,
> intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GAMUT_METADATA);
> }
>
> -static void
> -intel_dp_drrs_compute_config(struct intel_dp *intel_dp,
> - struct intel_crtc_state *pipe_config,
> - int output_bpp, bool constant_n)
> -{
> - struct intel_connector *intel_connector = intel_dp->attached_connector;
> - struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> - int pixel_clock;
> -
> - if (pipe_config->vrr.enable)
> - return;
> -
> - /*
> - * DRRS and PSR can't be enable together, so giving preference to PSR
> - * as it allows more power-savings by complete shutting down display,
> - * so to guarantee this, intel_dp_drrs_compute_config() must be called
> - * after intel_psr_compute_config().
> - */
> - if (pipe_config->has_psr)
> - return;
> -
> - if (!intel_connector->panel.downclock_mode ||
> - dev_priv->drrs.type != SEAMLESS_DRRS_SUPPORT)
> - return;
> -
> - pipe_config->has_drrs = true;
> -
> - pixel_clock = intel_connector->panel.downclock_mode->clock;
> - if (pipe_config->splitter.enable)
> - pixel_clock /= pipe_config->splitter.link_count;
> -
> - intel_link_compute_m_n(output_bpp, pipe_config->lane_count, pixel_clock,
> - pipe_config->port_clock, &pipe_config->dp_m2_n2,
> - constant_n, pipe_config->fec_enable);
> -
> - /* FIXME: abstract this better */
> - if (pipe_config->splitter.enable)
> - pipe_config->dp_m2_n2.gmch_m *= pipe_config->splitter.link_count;
> -}
> -
> int
> intel_dp_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> @@ -4715,432 +4676,6 @@ intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connect
> drm_connector_attach_vrr_capable_property(connector);
> }
>
> -/**
> - * intel_dp_set_drrs_state - program registers for RR switch to take effect
> - * @dev_priv: i915 device
> - * @crtc_state: a pointer to the active intel_crtc_state
> - * @refresh_rate: RR to be programmed
> - *
> - * This function gets called when refresh rate (RR) has to be changed from
> - * one frequency to another. Switches can be between high and low RR
> - * supported by the panel or to any other RR based on media playback (in
> - * this case, RR value needs to be passed from user space).
> - *
> - * The caller of this function needs to take a lock on dev_priv->drrs.
> - */
> -static void intel_dp_set_drrs_state(struct drm_i915_private *dev_priv,
> - const struct intel_crtc_state *crtc_state,
> - int refresh_rate)
> -{
> - struct intel_dp *intel_dp = dev_priv->drrs.dp;
> - struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> - enum drrs_refresh_rate_type index = DRRS_HIGH_RR;
> -
> - if (refresh_rate <= 0) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Refresh rate should be positive non-zero.\n");
> - return;
> - }
> -
> - if (intel_dp == NULL) {
> - drm_dbg_kms(&dev_priv->drm, "DRRS not supported.\n");
> - return;
> - }
> -
> - if (!crtc) {
> - drm_dbg_kms(&dev_priv->drm,
> - "DRRS: intel_crtc not initialized\n");
> - return;
> - }
> -
> - if (dev_priv->drrs.type < SEAMLESS_DRRS_SUPPORT) {
> - drm_dbg_kms(&dev_priv->drm, "Only Seamless DRRS supported.\n");
> - return;
> - }
> -
> - if (drm_mode_vrefresh(intel_dp->attached_connector->panel.downclock_mode) ==
> - refresh_rate)
> - index = DRRS_LOW_RR;
> -
> - if (index == dev_priv->drrs.refresh_rate_type) {
> - drm_dbg_kms(&dev_priv->drm,
> - "DRRS requested for previously set RR...ignoring\n");
> - return;
> - }
> -
> - if (!crtc_state->hw.active) {
> - drm_dbg_kms(&dev_priv->drm,
> - "eDP encoder disabled. CRTC not Active\n");
> - return;
> - }
> -
> - if (DISPLAY_VER(dev_priv) >= 8 && !IS_CHERRYVIEW(dev_priv)) {
> - switch (index) {
> - case DRRS_HIGH_RR:
> - intel_dp_set_m_n(crtc_state, M1_N1);
> - break;
> - case DRRS_LOW_RR:
> - intel_dp_set_m_n(crtc_state, M2_N2);
> - break;
> - case DRRS_MAX_RR:
> - default:
> - drm_err(&dev_priv->drm,
> - "Unsupported refreshrate type\n");
> - }
> - } else if (DISPLAY_VER(dev_priv) > 6) {
> - i915_reg_t reg = PIPECONF(crtc_state->cpu_transcoder);
> - u32 val;
> -
> - val = intel_de_read(dev_priv, reg);
> - if (index > DRRS_HIGH_RR) {
> - if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> - val |= PIPECONF_EDP_RR_MODE_SWITCH_VLV;
> - else
> - val |= PIPECONF_EDP_RR_MODE_SWITCH;
> - } else {
> - if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> - val &= ~PIPECONF_EDP_RR_MODE_SWITCH_VLV;
> - else
> - val &= ~PIPECONF_EDP_RR_MODE_SWITCH;
> - }
> - intel_de_write(dev_priv, reg, val);
> - }
> -
> - dev_priv->drrs.refresh_rate_type = index;
> -
> - drm_dbg_kms(&dev_priv->drm, "eDP Refresh Rate set to : %dHz\n",
> - refresh_rate);
> -}
> -
> -static void
> -intel_edp_drrs_enable_locked(struct intel_dp *intel_dp)
> -{
> - struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> -
> - dev_priv->drrs.busy_frontbuffer_bits = 0;
> - dev_priv->drrs.dp = intel_dp;
> -}
> -
> -/**
> - * intel_edp_drrs_enable - init drrs struct if supported
> - * @intel_dp: DP struct
> - * @crtc_state: A pointer to the active crtc state.
> - *
> - * Initializes frontbuffer_bits and drrs.dp
> - */
> -void intel_edp_drrs_enable(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state)
> -{
> - struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> -
> - if (!crtc_state->has_drrs)
> - return;
> -
> - drm_dbg_kms(&dev_priv->drm, "Enabling DRRS\n");
> -
> - mutex_lock(&dev_priv->drrs.mutex);
> -
> - if (dev_priv->drrs.dp) {
> - drm_warn(&dev_priv->drm, "DRRS already enabled\n");
> - goto unlock;
> - }
> -
> - intel_edp_drrs_enable_locked(intel_dp);
> -
> -unlock:
> - mutex_unlock(&dev_priv->drrs.mutex);
> -}
> -
> -static void
> -intel_edp_drrs_disable_locked(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state)
> -{
> - struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> -
> - if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR) {
> - int refresh;
> -
> - refresh = drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode);
> - intel_dp_set_drrs_state(dev_priv, crtc_state, refresh);
> - }
> -
> - dev_priv->drrs.dp = NULL;
> -}
> -
> -/**
> - * intel_edp_drrs_disable - Disable DRRS
> - * @intel_dp: DP struct
> - * @old_crtc_state: Pointer to old crtc_state.
> - *
> - */
> -void intel_edp_drrs_disable(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *old_crtc_state)
> -{
> - struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> -
> - if (!old_crtc_state->has_drrs)
> - return;
> -
> - mutex_lock(&dev_priv->drrs.mutex);
> - if (!dev_priv->drrs.dp) {
> - mutex_unlock(&dev_priv->drrs.mutex);
> - return;
> - }
> -
> - intel_edp_drrs_disable_locked(intel_dp, old_crtc_state);
> - mutex_unlock(&dev_priv->drrs.mutex);
> -
> - cancel_delayed_work_sync(&dev_priv->drrs.work);
> -}
> -
> -/**
> - * intel_edp_drrs_update - Update DRRS state
> - * @intel_dp: Intel DP
> - * @crtc_state: new CRTC state
> - *
> - * This function will update DRRS states, disabling or enabling DRRS when
> - * executing fastsets. For full modeset, intel_edp_drrs_disable() and
> - * intel_edp_drrs_enable() should be called instead.
> - */
> -void
> -intel_edp_drrs_update(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state)
> -{
> - struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> -
> - if (dev_priv->drrs.type != SEAMLESS_DRRS_SUPPORT)
> - return;
> -
> - mutex_lock(&dev_priv->drrs.mutex);
> -
> - /* New state matches current one? */
> - if (crtc_state->has_drrs == !!dev_priv->drrs.dp)
> - goto unlock;
> -
> - if (crtc_state->has_drrs)
> - intel_edp_drrs_enable_locked(intel_dp);
> - else
> - intel_edp_drrs_disable_locked(intel_dp, crtc_state);
> -
> -unlock:
> - mutex_unlock(&dev_priv->drrs.mutex);
> -}
> -
> -static void intel_edp_drrs_downclock_work(struct work_struct *work)
> -{
> - struct drm_i915_private *dev_priv =
> - container_of(work, typeof(*dev_priv), drrs.work.work);
> - struct intel_dp *intel_dp;
> -
> - mutex_lock(&dev_priv->drrs.mutex);
> -
> - intel_dp = dev_priv->drrs.dp;
> -
> - if (!intel_dp)
> - goto unlock;
> -
> - /*
> - * The delayed work can race with an invalidate hence we need to
> - * recheck.
> - */
> -
> - if (dev_priv->drrs.busy_frontbuffer_bits)
> - goto unlock;
> -
> - if (dev_priv->drrs.refresh_rate_type != DRRS_LOW_RR) {
> - struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
> -
> - intel_dp_set_drrs_state(dev_priv, to_intel_crtc(crtc)->config,
> - drm_mode_vrefresh(intel_dp->attached_connector->panel.downclock_mode));
> - }
> -
> -unlock:
> - mutex_unlock(&dev_priv->drrs.mutex);
> -}
> -
> -/**
> - * intel_edp_drrs_invalidate - Disable Idleness DRRS
> - * @dev_priv: i915 device
> - * @frontbuffer_bits: frontbuffer plane tracking bits
> - *
> - * This function gets called everytime rendering on the given planes start.
> - * Hence DRRS needs to be Upclocked, i.e. (LOW_RR -> HIGH_RR).
> - *
> - * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits.
> - */
> -void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
> - unsigned int frontbuffer_bits)
> -{
> - struct intel_dp *intel_dp;
> - struct drm_crtc *crtc;
> - enum pipe pipe;
> -
> - if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED)
> - return;
> -
> - cancel_delayed_work(&dev_priv->drrs.work);
> -
> - mutex_lock(&dev_priv->drrs.mutex);
> -
> - intel_dp = dev_priv->drrs.dp;
> - if (!intel_dp) {
> - mutex_unlock(&dev_priv->drrs.mutex);
> - return;
> - }
> -
> - crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
> - pipe = to_intel_crtc(crtc)->pipe;
> -
> - frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
> - dev_priv->drrs.busy_frontbuffer_bits |= frontbuffer_bits;
> -
> - /* invalidate means busy screen hence upclock */
> - if (frontbuffer_bits && dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR)
> - intel_dp_set_drrs_state(dev_priv, to_intel_crtc(crtc)->config,
> - drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode));
> -
> - mutex_unlock(&dev_priv->drrs.mutex);
> -}
> -
> -/**
> - * intel_edp_drrs_flush - Restart Idleness DRRS
> - * @dev_priv: i915 device
> - * @frontbuffer_bits: frontbuffer plane tracking bits
> - *
> - * This function gets called every time rendering on the given planes has
> - * completed or flip on a crtc is completed. So DRRS should be upclocked
> - * (LOW_RR -> HIGH_RR). And also Idleness detection should be started again,
> - * if no other planes are dirty.
> - *
> - * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits.
> - */
> -void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
> - unsigned int frontbuffer_bits)
> -{
> - struct intel_dp *intel_dp;
> - struct drm_crtc *crtc;
> - enum pipe pipe;
> -
> - if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED)
> - return;
> -
> - cancel_delayed_work(&dev_priv->drrs.work);
> -
> - mutex_lock(&dev_priv->drrs.mutex);
> -
> - intel_dp = dev_priv->drrs.dp;
> - if (!intel_dp) {
> - mutex_unlock(&dev_priv->drrs.mutex);
> - return;
> - }
> -
> - crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
> - pipe = to_intel_crtc(crtc)->pipe;
> -
> - frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
> - dev_priv->drrs.busy_frontbuffer_bits &= ~frontbuffer_bits;
> -
> - /* flush means busy screen hence upclock */
> - if (frontbuffer_bits && dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR)
> - intel_dp_set_drrs_state(dev_priv, to_intel_crtc(crtc)->config,
> - drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode));
> -
> - /*
> - * flush also means no more activity hence schedule downclock, if all
> - * other fbs are quiescent too
> - */
> - if (!dev_priv->drrs.busy_frontbuffer_bits)
> - schedule_delayed_work(&dev_priv->drrs.work,
> - msecs_to_jiffies(1000));
> - mutex_unlock(&dev_priv->drrs.mutex);
> -}
> -
> -/**
> - * DOC: Display Refresh Rate Switching (DRRS)
> - *
> - * Display Refresh Rate Switching (DRRS) is a power conservation feature
> - * which enables swtching between low and high refresh rates,
> - * dynamically, based on the usage scenario. This feature is applicable
> - * for internal panels.
> - *
> - * Indication that the panel supports DRRS is given by the panel EDID, which
> - * would list multiple refresh rates for one resolution.
> - *
> - * DRRS is of 2 types - static and seamless.
> - * Static DRRS involves changing refresh rate (RR) by doing a full modeset
> - * (may appear as a blink on screen) and is used in dock-undock scenario.
> - * Seamless DRRS involves changing RR without any visual effect to the user
> - * and can be used during normal system usage. This is done by programming
> - * certain registers.
> - *
> - * Support for static/seamless DRRS may be indicated in the VBT based on
> - * inputs from the panel spec.
> - *
> - * DRRS saves power by switching to low RR based on usage scenarios.
> - *
> - * The implementation is based on frontbuffer tracking implementation. When
> - * there is a disturbance on the screen triggered by user activity or a periodic
> - * system activity, DRRS is disabled (RR is changed to high RR). When there is
> - * no movement on screen, after a timeout of 1 second, a switch to low RR is
> - * made.
> - *
> - * For integration with frontbuffer tracking code, intel_edp_drrs_invalidate()
> - * and intel_edp_drrs_flush() are called.
> - *
> - * DRRS can be further extended to support other internal panels and also
> - * the scenario of video playback wherein RR is set based on the rate
> - * requested by userspace.
> - */
> -
> -/**
> - * intel_dp_drrs_init - Init basic DRRS work and mutex.
> - * @connector: eDP connector
> - * @fixed_mode: preferred mode of panel
> - *
> - * This function is called only once at driver load to initialize basic
> - * DRRS stuff.
> - *
> - * Returns:
> - * Downclock mode if panel supports it, else return NULL.
> - * DRRS support is determined by the presence of downclock mode (apart
> - * from VBT setting).
> - */
> -static struct drm_display_mode *
> -intel_dp_drrs_init(struct intel_connector *connector,
> - struct drm_display_mode *fixed_mode)
> -{
> - struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> - struct drm_display_mode *downclock_mode = NULL;
> -
> - INIT_DELAYED_WORK(&dev_priv->drrs.work, intel_edp_drrs_downclock_work);
> - mutex_init(&dev_priv->drrs.mutex);
> -
> - if (DISPLAY_VER(dev_priv) <= 6) {
> - drm_dbg_kms(&dev_priv->drm,
> - "DRRS supported for Gen7 and above\n");
> - return NULL;
> - }
> -
> - if (dev_priv->vbt.drrs_type != SEAMLESS_DRRS_SUPPORT) {
> - drm_dbg_kms(&dev_priv->drm, "VBT doesn't support DRRS\n");
> - return NULL;
> - }
> -
> - downclock_mode = intel_panel_edid_downclock_mode(connector, fixed_mode);
> - if (!downclock_mode) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Downclock mode is not found. DRRS not supported\n");
> - return NULL;
> - }
> -
> - dev_priv->drrs.type = dev_priv->vbt.drrs_type;
> -
> - dev_priv->drrs.refresh_rate_type = DRRS_HIGH_RR;
> - drm_dbg_kms(&dev_priv->drm,
> - "seamless DRRS supported for eDP panel.\n");
> - return downclock_mode;
> -}
> -
> static bool intel_edp_init_connector(struct intel_dp *intel_dp,
> struct intel_connector *intel_connector)
> {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
> index 680631b5b4378..38ff0e4f65504 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> @@ -70,17 +70,6 @@ int intel_dp_max_link_rate(struct intel_dp *intel_dp);
> int intel_dp_max_lane_count(struct intel_dp *intel_dp);
> int intel_dp_rate_select(struct intel_dp *intel_dp, int rate);
>
> -void intel_edp_drrs_enable(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state);
> -void intel_edp_drrs_disable(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state);
> -void intel_edp_drrs_update(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state);
> -void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
> - unsigned int frontbuffer_bits);
> -void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
> - unsigned int frontbuffer_bits);
> -
> void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
> u8 *link_bw, u8 *rate_select);
> bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp);
> diff --git a/drivers/gpu/drm/i915/display/intel_drrs.c b/drivers/gpu/drm/i915/display/intel_drrs.c
> new file mode 100644
> index 0000000000000..be9b6d4482f04
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/display/intel_drrs.c
> @@ -0,0 +1,477 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2021 Intel Corporation
> + */
> +
> +#include "i915_drv.h"
> +#include "intel_atomic.h"
> +#include "intel_de.h"
> +#include "intel_display_types.h"
> +#include "intel_drrs.h"
> +#include "intel_panel.h"
> +
> +/**
> + * DOC: Display Refresh Rate Switching (DRRS)
> + *
> + * Display Refresh Rate Switching (DRRS) is a power conservation feature
> + * which enables swtching between low and high refresh rates,
> + * dynamically, based on the usage scenario. This feature is applicable
> + * for internal panels.
> + *
> + * Indication that the panel supports DRRS is given by the panel EDID, which
> + * would list multiple refresh rates for one resolution.
> + *
> + * DRRS is of 2 types - static and seamless.
> + * Static DRRS involves changing refresh rate (RR) by doing a full modeset
> + * (may appear as a blink on screen) and is used in dock-undock scenario.
> + * Seamless DRRS involves changing RR without any visual effect to the user
> + * and can be used during normal system usage. This is done by programming
> + * certain registers.
> + *
> + * Support for static/seamless DRRS may be indicated in the VBT based on
> + * inputs from the panel spec.
> + *
> + * DRRS saves power by switching to low RR based on usage scenarios.
> + *
> + * The implementation is based on frontbuffer tracking implementation. When
> + * there is a disturbance on the screen triggered by user activity or a periodic
> + * system activity, DRRS is disabled (RR is changed to high RR). When there is
> + * no movement on screen, after a timeout of 1 second, a switch to low RR is
> + * made.
> + *
> + * For integration with frontbuffer tracking code, intel_edp_drrs_invalidate()
> + * and intel_edp_drrs_flush() are called.
> + *
> + * DRRS can be further extended to support other internal panels and also
> + * the scenario of video playback wherein RR is set based on the rate
> + * requested by userspace.
> + */
> +
> +void
> +intel_dp_drrs_compute_config(struct intel_dp *intel_dp,
> + struct intel_crtc_state *pipe_config,
> + int output_bpp, bool constant_n)
> +{
> + struct intel_connector *intel_connector = intel_dp->attached_connector;
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> + int pixel_clock;
> +
> + if (pipe_config->vrr.enable)
> + return;
> +
> + /*
> + * DRRS and PSR can't be enable together, so giving preference to PSR
> + * as it allows more power-savings by complete shutting down display,
> + * so to guarantee this, intel_dp_drrs_compute_config() must be called
> + * after intel_psr_compute_config().
> + */
> + if (pipe_config->has_psr)
> + return;
> +
> + if (!intel_connector->panel.downclock_mode ||
> + dev_priv->drrs.type != SEAMLESS_DRRS_SUPPORT)
> + return;
> +
> + pipe_config->has_drrs = true;
> +
> + pixel_clock = intel_connector->panel.downclock_mode->clock;
> + if (pipe_config->splitter.enable)
> + pixel_clock /= pipe_config->splitter.link_count;
> +
> + intel_link_compute_m_n(output_bpp, pipe_config->lane_count, pixel_clock,
> + pipe_config->port_clock, &pipe_config->dp_m2_n2,
> + constant_n, pipe_config->fec_enable);
> +
> + /* FIXME: abstract this better */
> + if (pipe_config->splitter.enable)
> + pipe_config->dp_m2_n2.gmch_m *= pipe_config->splitter.link_count;
> +}
> +
> +/**
> + * intel_dp_set_drrs_state - program registers for RR switch to take effect
> + * @dev_priv: i915 device
> + * @crtc_state: a pointer to the active intel_crtc_state
> + * @refresh_rate: RR to be programmed
> + *
> + * This function gets called when refresh rate (RR) has to be changed from
> + * one frequency to another. Switches can be between high and low RR
> + * supported by the panel or to any other RR based on media playback (in
> + * this case, RR value needs to be passed from user space).
> + *
> + * The caller of this function needs to take a lock on dev_priv->drrs.
> + */
> +static void intel_dp_set_drrs_state(struct drm_i915_private *dev_priv,
> + const struct intel_crtc_state *crtc_state,
> + int refresh_rate)
> +{
> + struct intel_dp *intel_dp = dev_priv->drrs.dp;
> + struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> + enum drrs_refresh_rate_type index = DRRS_HIGH_RR;
> +
> + if (refresh_rate <= 0) {
> + drm_dbg_kms(&dev_priv->drm,
> + "Refresh rate should be positive non-zero.\n");
> + return;
> + }
> +
> + if (intel_dp == NULL) {
> + drm_dbg_kms(&dev_priv->drm, "DRRS not supported.\n");
> + return;
> + }
> +
> + if (!crtc) {
> + drm_dbg_kms(&dev_priv->drm,
> + "DRRS: intel_crtc not initialized\n");
> + return;
> + }
> +
> + if (dev_priv->drrs.type < SEAMLESS_DRRS_SUPPORT) {
> + drm_dbg_kms(&dev_priv->drm, "Only Seamless DRRS supported.\n");
> + return;
> + }
> +
> + if (drm_mode_vrefresh(intel_dp->attached_connector->panel.downclock_mode) ==
> + refresh_rate)
> + index = DRRS_LOW_RR;
> +
> + if (index == dev_priv->drrs.refresh_rate_type) {
> + drm_dbg_kms(&dev_priv->drm,
> + "DRRS requested for previously set RR...ignoring\n");
> + return;
> + }
> +
> + if (!crtc_state->hw.active) {
> + drm_dbg_kms(&dev_priv->drm,
> + "eDP encoder disabled. CRTC not Active\n");
> + return;
> + }
> +
> + if (DISPLAY_VER(dev_priv) >= 8 && !IS_CHERRYVIEW(dev_priv)) {
> + switch (index) {
> + case DRRS_HIGH_RR:
> + intel_dp_set_m_n(crtc_state, M1_N1);
> + break;
> + case DRRS_LOW_RR:
> + intel_dp_set_m_n(crtc_state, M2_N2);
> + break;
> + case DRRS_MAX_RR:
> + default:
> + drm_err(&dev_priv->drm,
> + "Unsupported refreshrate type\n");
> + }
> + } else if (DISPLAY_VER(dev_priv) > 6) {
> + i915_reg_t reg = PIPECONF(crtc_state->cpu_transcoder);
> + u32 val;
> +
> + val = intel_de_read(dev_priv, reg);
> + if (index > DRRS_HIGH_RR) {
> + if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> + val |= PIPECONF_EDP_RR_MODE_SWITCH_VLV;
> + else
> + val |= PIPECONF_EDP_RR_MODE_SWITCH;
> + } else {
> + if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> + val &= ~PIPECONF_EDP_RR_MODE_SWITCH_VLV;
> + else
> + val &= ~PIPECONF_EDP_RR_MODE_SWITCH;
> + }
> + intel_de_write(dev_priv, reg, val);
> + }
> +
> + dev_priv->drrs.refresh_rate_type = index;
> +
> + drm_dbg_kms(&dev_priv->drm, "eDP Refresh Rate set to : %dHz\n",
> + refresh_rate);
> +}
> +
> +static void
> +intel_edp_drrs_enable_locked(struct intel_dp *intel_dp)
> +{
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> + dev_priv->drrs.busy_frontbuffer_bits = 0;
> + dev_priv->drrs.dp = intel_dp;
> +}
> +
> +/**
> + * intel_edp_drrs_enable - init drrs struct if supported
> + * @intel_dp: DP struct
> + * @crtc_state: A pointer to the active crtc state.
> + *
> + * Initializes frontbuffer_bits and drrs.dp
> + */
> +void intel_edp_drrs_enable(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> + if (!crtc_state->has_drrs)
> + return;
> +
> + drm_dbg_kms(&dev_priv->drm, "Enabling DRRS\n");
> +
> + mutex_lock(&dev_priv->drrs.mutex);
> +
> + if (dev_priv->drrs.dp) {
> + drm_warn(&dev_priv->drm, "DRRS already enabled\n");
> + goto unlock;
> + }
> +
> + intel_edp_drrs_enable_locked(intel_dp);
> +
> +unlock:
> + mutex_unlock(&dev_priv->drrs.mutex);
> +}
> +
> +static void
> +intel_edp_drrs_disable_locked(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> + if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR) {
> + int refresh;
> +
> + refresh = drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode);
> + intel_dp_set_drrs_state(dev_priv, crtc_state, refresh);
> + }
> +
> + dev_priv->drrs.dp = NULL;
> +}
> +
> +/**
> + * intel_edp_drrs_disable - Disable DRRS
> + * @intel_dp: DP struct
> + * @old_crtc_state: Pointer to old crtc_state.
> + *
> + */
> +void intel_edp_drrs_disable(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *old_crtc_state)
> +{
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> + if (!old_crtc_state->has_drrs)
> + return;
> +
> + mutex_lock(&dev_priv->drrs.mutex);
> + if (!dev_priv->drrs.dp) {
> + mutex_unlock(&dev_priv->drrs.mutex);
> + return;
> + }
> +
> + intel_edp_drrs_disable_locked(intel_dp, old_crtc_state);
> + mutex_unlock(&dev_priv->drrs.mutex);
> +
> + cancel_delayed_work_sync(&dev_priv->drrs.work);
> +}
> +
> +/**
> + * intel_edp_drrs_update - Update DRRS state
> + * @intel_dp: Intel DP
> + * @crtc_state: new CRTC state
> + *
> + * This function will update DRRS states, disabling or enabling DRRS when
> + * executing fastsets. For full modeset, intel_edp_drrs_disable() and
> + * intel_edp_drrs_enable() should be called instead.
> + */
> +void
> +intel_edp_drrs_update(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> + if (dev_priv->drrs.type != SEAMLESS_DRRS_SUPPORT)
> + return;
> +
> + mutex_lock(&dev_priv->drrs.mutex);
> +
> + /* New state matches current one? */
> + if (crtc_state->has_drrs == !!dev_priv->drrs.dp)
> + goto unlock;
> +
> + if (crtc_state->has_drrs)
> + intel_edp_drrs_enable_locked(intel_dp);
> + else
> + intel_edp_drrs_disable_locked(intel_dp, crtc_state);
> +
> +unlock:
> + mutex_unlock(&dev_priv->drrs.mutex);
> +}
> +
> +static void intel_edp_drrs_downclock_work(struct work_struct *work)
> +{
> + struct drm_i915_private *dev_priv =
> + container_of(work, typeof(*dev_priv), drrs.work.work);
> + struct intel_dp *intel_dp;
> +
> + mutex_lock(&dev_priv->drrs.mutex);
> +
> + intel_dp = dev_priv->drrs.dp;
> +
> + if (!intel_dp)
> + goto unlock;
> +
> + /*
> + * The delayed work can race with an invalidate hence we need to
> + * recheck.
> + */
> +
> + if (dev_priv->drrs.busy_frontbuffer_bits)
> + goto unlock;
> +
> + if (dev_priv->drrs.refresh_rate_type != DRRS_LOW_RR) {
> + struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
> +
> + intel_dp_set_drrs_state(dev_priv, to_intel_crtc(crtc)->config,
> + drm_mode_vrefresh(intel_dp->attached_connector->panel.downclock_mode));
> + }
> +
> +unlock:
> + mutex_unlock(&dev_priv->drrs.mutex);
> +}
> +
> +/**
> + * intel_edp_drrs_invalidate - Disable Idleness DRRS
> + * @dev_priv: i915 device
> + * @frontbuffer_bits: frontbuffer plane tracking bits
> + *
> + * This function gets called everytime rendering on the given planes start.
> + * Hence DRRS needs to be Upclocked, i.e. (LOW_RR -> HIGH_RR).
> + *
> + * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits.
> + */
> +void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
> + unsigned int frontbuffer_bits)
> +{
> + struct intel_dp *intel_dp;
> + struct drm_crtc *crtc;
> + enum pipe pipe;
> +
> + if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED)
> + return;
> +
> + cancel_delayed_work(&dev_priv->drrs.work);
> +
> + mutex_lock(&dev_priv->drrs.mutex);
> +
> + intel_dp = dev_priv->drrs.dp;
> + if (!intel_dp) {
> + mutex_unlock(&dev_priv->drrs.mutex);
> + return;
> + }
> +
> + crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
> + pipe = to_intel_crtc(crtc)->pipe;
> +
> + frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
> + dev_priv->drrs.busy_frontbuffer_bits |= frontbuffer_bits;
> +
> + /* invalidate means busy screen hence upclock */
> + if (frontbuffer_bits && dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR)
> + intel_dp_set_drrs_state(dev_priv, to_intel_crtc(crtc)->config,
> + drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode));
> +
> + mutex_unlock(&dev_priv->drrs.mutex);
> +}
> +
> +/**
> + * intel_edp_drrs_flush - Restart Idleness DRRS
> + * @dev_priv: i915 device
> + * @frontbuffer_bits: frontbuffer plane tracking bits
> + *
> + * This function gets called every time rendering on the given planes has
> + * completed or flip on a crtc is completed. So DRRS should be upclocked
> + * (LOW_RR -> HIGH_RR). And also Idleness detection should be started again,
> + * if no other planes are dirty.
> + *
> + * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits.
> + */
> +void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
> + unsigned int frontbuffer_bits)
> +{
> + struct intel_dp *intel_dp;
> + struct drm_crtc *crtc;
> + enum pipe pipe;
> +
> + if (dev_priv->drrs.type == DRRS_NOT_SUPPORTED)
> + return;
> +
> + cancel_delayed_work(&dev_priv->drrs.work);
> +
> + mutex_lock(&dev_priv->drrs.mutex);
> +
> + intel_dp = dev_priv->drrs.dp;
> + if (!intel_dp) {
> + mutex_unlock(&dev_priv->drrs.mutex);
> + return;
> + }
> +
> + crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
> + pipe = to_intel_crtc(crtc)->pipe;
> +
> + frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
> + dev_priv->drrs.busy_frontbuffer_bits &= ~frontbuffer_bits;
> +
> + /* flush means busy screen hence upclock */
> + if (frontbuffer_bits && dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR)
> + intel_dp_set_drrs_state(dev_priv, to_intel_crtc(crtc)->config,
> + drm_mode_vrefresh(intel_dp->attached_connector->panel.fixed_mode));
> +
> + /*
> + * flush also means no more activity hence schedule downclock, if all
> + * other fbs are quiescent too
> + */
> + if (!dev_priv->drrs.busy_frontbuffer_bits)
> + schedule_delayed_work(&dev_priv->drrs.work,
> + msecs_to_jiffies(1000));
> + mutex_unlock(&dev_priv->drrs.mutex);
> +}
> +
> +/**
> + * intel_dp_drrs_init - Init basic DRRS work and mutex.
> + * @connector: eDP connector
> + * @fixed_mode: preferred mode of panel
> + *
> + * This function is called only once at driver load to initialize basic
> + * DRRS stuff.
> + *
> + * Returns:
> + * Downclock mode if panel supports it, else return NULL.
> + * DRRS support is determined by the presence of downclock mode (apart
> + * from VBT setting).
> + */
> +struct drm_display_mode *
> +intel_dp_drrs_init(struct intel_connector *connector,
> + struct drm_display_mode *fixed_mode)
> +{
> + struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> + struct drm_display_mode *downclock_mode = NULL;
> +
> + INIT_DELAYED_WORK(&dev_priv->drrs.work, intel_edp_drrs_downclock_work);
> + mutex_init(&dev_priv->drrs.mutex);
> +
> + if (DISPLAY_VER(dev_priv) <= 6) {
> + drm_dbg_kms(&dev_priv->drm,
> + "DRRS supported for Gen7 and above\n");
> + return NULL;
> + }
> +
> + if (dev_priv->vbt.drrs_type != SEAMLESS_DRRS_SUPPORT) {
> + drm_dbg_kms(&dev_priv->drm, "VBT doesn't support DRRS\n");
> + return NULL;
> + }
> +
> + downclock_mode = intel_panel_edid_downclock_mode(connector, fixed_mode);
> + if (!downclock_mode) {
> + drm_dbg_kms(&dev_priv->drm,
> + "Downclock mode is not found. DRRS not supported\n");
> + return NULL;
> + }
> +
> + dev_priv->drrs.type = dev_priv->vbt.drrs_type;
> +
> + dev_priv->drrs.refresh_rate_type = DRRS_HIGH_RR;
> + drm_dbg_kms(&dev_priv->drm,
> + "seamless DRRS supported for eDP panel.\n");
> + return downclock_mode;
> +}
> diff --git a/drivers/gpu/drm/i915/display/intel_drrs.h b/drivers/gpu/drm/i915/display/intel_drrs.h
> new file mode 100644
> index 0000000000000..ffa175b4cf4f4
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/display/intel_drrs.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2021 Intel Corporation
> + */
> +
> +#ifndef __INTEL_DRRS_H__
> +#define __INTEL_DRRS_H__
> +
> +#include <linux/types.h>
> +
> +struct drm_i915_private;
> +struct intel_crtc_state;
> +struct intel_connector;
> +struct intel_dp;
> +
> +void intel_edp_drrs_enable(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *crtc_state);
> +void intel_edp_drrs_disable(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *crtc_state);
> +void intel_edp_drrs_update(struct intel_dp *intel_dp,
> + const struct intel_crtc_state *crtc_state);
> +void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
> + unsigned int frontbuffer_bits);
> +void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
> + unsigned int frontbuffer_bits);
> +void intel_dp_drrs_compute_config(struct intel_dp *intel_dp,
> + struct intel_crtc_state *pipe_config,
> + int output_bpp, bool constant_n);
> +struct drm_display_mode *intel_dp_drrs_init(struct intel_connector *connector,
> + struct drm_display_mode *fixed_mode);
> +
> +#endif /* __INTEL_DRRS_H__ */
> diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
> index 8e75debcce1a9..e4834d84ce5e3 100644
> --- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
> +++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
> @@ -62,6 +62,7 @@
> #include "intel_display_types.h"
> #include "intel_fbc.h"
> #include "intel_frontbuffer.h"
> +#include "intel_drrs.h"
> #include "intel_psr.h"
>
> /**
--
Jani Nikula, Intel Open Source Graphics Center
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