[Intel-gfx] [PATCH 4/6] drm/i915: Idleness detection for DRRS
Jani Nikula
jani.nikula at linux.intel.com
Tue Apr 1 15:36:14 CEST 2014
On Fri, 28 Mar 2014, Vandana Kannan <vandana.kannan at intel.com> wrote:
> Adding support to detect display idleness by tracking page flip from
> user space. Switch to low refresh rate is triggered after 2 seconds of
> idleness. The delay is configurable. If there is a page flip or call to
> update the plane, then high refresh rate is applied.
> The feature is not used in dual-display mode.
>
> v2: Chris Wilson's review comments incorporated.
> Modify idleness detection implementation to make it similar to the
> implementation of intel_update_fbc/intel_disable_fbc
>
> v3: Internal review comments incorporated
> Add NULL pointer check in intel_disable_drrs.
> Add drrs calls in i9xx_crtc_enable/disable and valleyview_crtc_enable.
>
> v4: Jani's review comments incorporated.
> Change in sequence in intel_update_drrs. Comment modified to remove details
> of update param. Modified DRRS idleness interval to a module parameter.
>
> v5: Chris's review comments incorporated.
> Initialize connector in idleness detection init. Modifications made to
> use only intel_connector in i915_drrs and derive intel_dp when required.
> Added a function drrs_fini to cleanup DRRS work.
>
> v6: Internal review comments. Removed check for primary enabled, which is
> a redundant check, in the case of clone mode. Added a flag to track
> dual-display configuration. Remove print statement for "cancel DRR work"
> and print "DRRS not supported" only once.
>
> v7: As per internal review comments, removing calls to update/disable drrs
> from sprite update path. For sprite, all drrs related updates would be
> taken care of with calls to crtc page flip itself. This will have to be
> revisited later if flip infrastructure changes for sprite.
>
> v8: Incorporated Jani's review comments. Added space after the periods in the
> module param description. Changes around drrs-fini to remove seamless DRRS
> check.
>
> Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
> Signed-off-by: Pradeep Bhat <pradeep.bhat at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 7 ++
> drivers/gpu/drm/i915/i915_params.c | 8 ++
> drivers/gpu/drm/i915/intel_display.c | 16 ++++
> drivers/gpu/drm/i915/intel_dp.c | 22 +++++-
> drivers/gpu/drm/i915/intel_drv.h | 5 +-
> drivers/gpu/drm/i915/intel_pm.c | 138 ++++++++++++++++++++++++++++++++++
> 6 files changed, 193 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 1c9d5cf..c4e9b37 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -796,6 +796,12 @@ struct i915_fbc {
>
> struct i915_drrs {
> struct intel_connector *connector;
> + bool is_clone;
> + struct intel_drrs_work {
> + struct delayed_work work;
> + struct drm_crtc *crtc;
> + int interval;
> + } *drrs_work;
> };
>
> struct i915_psr {
> @@ -2092,6 +2098,7 @@ struct i915_params {
> int enable_ips;
> int invert_brightness;
> int enable_cmd_parser;
> + int drrs_interval;
> /* leave bools at the end to not create holes */
> bool enable_hangcheck;
> bool fastboot;
> diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
> index d1d7980..05ca0a0 100644
> --- a/drivers/gpu/drm/i915/i915_params.c
> +++ b/drivers/gpu/drm/i915/i915_params.c
> @@ -47,6 +47,7 @@ struct i915_params i915 __read_mostly = {
> .invert_brightness = 0,
> .disable_display = 0,
> .enable_cmd_parser = 0,
> + .drrs_interval = 2000,
> };
>
> module_param_named(modeset, i915.modeset, int, 0400);
> @@ -152,3 +153,10 @@ MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
> module_param_named(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
> MODULE_PARM_DESC(enable_cmd_parser,
> "Enable command parsing (1=enabled, 0=disabled [default])");
> +
> +module_param_named(drrs_interval, i915.drrs_interval, int, 0600);
> +MODULE_PARM_DESC(drrs_interval,
> + "DRRS idleness detection interval (default: 2000 ms). "
> + "If this field is set to 0, then seamless DRRS feature "
> + "based on idleness detection is disabled. "
> + "The interval is to be set in milliseconds.");
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 7e4ea8d..c309561 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2542,6 +2542,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
>
> mutex_lock(&dev->struct_mutex);
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
> intel_edp_psr_update(dev);
> mutex_unlock(&dev->struct_mutex);
>
> @@ -3708,6 +3709,7 @@ static void ironlake_crtc_enable(struct drm_crtc *crtc)
>
> mutex_lock(&dev->struct_mutex);
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
> mutex_unlock(&dev->struct_mutex);
>
> for_each_encoder_on_crtc(dev, crtc, encoder)
> @@ -3751,6 +3753,7 @@ static void haswell_crtc_enable_planes(struct drm_crtc *crtc)
>
> mutex_lock(&dev->struct_mutex);
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
> mutex_unlock(&dev->struct_mutex);
>
> drm_vblank_on(dev, pipe);
> @@ -3948,6 +3951,7 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
>
> mutex_lock(&dev->struct_mutex);
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
> mutex_unlock(&dev->struct_mutex);
> }
>
> @@ -3995,6 +3999,7 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
>
> mutex_lock(&dev->struct_mutex);
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
> mutex_unlock(&dev->struct_mutex);
> }
>
> @@ -4391,6 +4396,7 @@ static void valleyview_crtc_enable(struct drm_crtc *crtc)
> intel_crtc_update_cursor(crtc, true);
>
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
>
> for_each_encoder_on_crtc(dev, crtc, encoder)
> encoder->enable(encoder);
> @@ -4438,6 +4444,7 @@ static void i9xx_crtc_enable(struct drm_crtc *crtc)
> intel_crtc_dpms_overlay(intel_crtc, true);
>
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
>
> for_each_encoder_on_crtc(dev, crtc, encoder)
> encoder->enable(encoder);
> @@ -4505,6 +4512,7 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
> intel_update_watermarks(crtc);
>
> intel_update_fbc(dev);
> + intel_update_drrs(dev);
> }
>
> static void i9xx_crtc_off(struct drm_crtc *crtc)
> @@ -8508,6 +8516,10 @@ static void intel_unpin_work_fn(struct work_struct *__work)
> drm_gem_object_unreference(&work->pending_flip_obj->base);
> drm_gem_object_unreference(&work->old_fb_obj->base);
>
> + /* disable current DRRS work scheduled and restart
> + * to push work by another x seconds
> + */
> + intel_update_drrs(dev);
> intel_update_fbc(dev);
> mutex_unlock(&dev->struct_mutex);
>
> @@ -8966,6 +8978,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
> goto cleanup_pending;
>
> intel_disable_fbc(dev);
> + intel_disable_drrs(dev);
> intel_mark_fb_busy(obj, NULL);
> mutex_unlock(&dev->struct_mutex);
>
> @@ -11338,6 +11351,7 @@ void intel_modeset_init(struct drm_device *dev)
>
> /* Just in case the BIOS is doing something questionable. */
> intel_disable_fbc(dev);
> + intel_disable_drrs(dev);
>
> mutex_lock(&dev->mode_config.mutex);
> intel_modeset_setup_hw_state(dev, false);
> @@ -11803,6 +11817,8 @@ void intel_modeset_cleanup(struct drm_device *dev)
>
> intel_disable_fbc(dev);
>
> + intel_disable_drrs(dev);
> +
> intel_disable_gt_powersave(dev);
>
> ironlake_teardown_rc6(dev);
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 9640df1..4f0281a 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3351,16 +3351,33 @@ intel_dp_connector_destroy(struct drm_connector *connector)
> kfree(connector);
> }
>
> +static void
> +intel_dp_drrs_fini(struct drm_i915_private *dev_priv)
> +{
> + if (cancel_delayed_work_sync(&dev_priv->drrs.drrs_work->work)) {
> + kfree(dev_priv->drrs.drrs_work);
> + dev_priv->drrs.drrs_work = NULL;
> + dev_priv->drrs.connector = NULL;
> + }
> +}
> +
> void intel_dp_encoder_destroy(struct drm_encoder *encoder)
> {
> struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
> struct intel_dp *intel_dp = &intel_dig_port->dp;
> struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct drm_i915_private *dev_priv = dev->dev_private;
>
> drm_dp_aux_unregister_i2c_bus(&intel_dp->aux);
> drm_encoder_cleanup(encoder);
> if (is_edp(intel_dp)) {
> cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
> +
> + if (dev_priv->drrs.connector && dev_priv->drrs.drrs_work &&
> + intel_dp == enc_to_intel_dp(
> + &dev_priv->drrs.connector->encoder->base))
> + intel_dp_drrs_fini(dev_priv);
> +
> mutex_lock(&dev->mode_config.mutex);
> edp_panel_vdd_off_sync(intel_dp);
> mutex_unlock(&dev->mode_config.mutex);
> @@ -3751,7 +3768,7 @@ intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
>
> if (downclock_mode != NULL &&
> dev_priv->vbt.drrs_type == SEAMLESS_DRRS_SUPPORT) {
> - dev_priv->drrs.connector = intel_connector;
> + intel_init_drrs_idleness_detection(dev, intel_connector);
>
> mutex_init(&intel_dp->drrs_state.mutex);
>
> @@ -3759,7 +3776,8 @@ intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
>
> intel_dp->drrs_state.refresh_rate_type = DRRS_HIGH_RR;
> DRM_INFO("seamless DRRS supported for eDP panel.\n");
> - }
> + } else
> + DRM_INFO("DRRS not supported\n");
>
> return downclock_mode;
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 46fc8b3..570cc47 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -930,7 +930,10 @@ void intel_runtime_pm_put(struct drm_i915_private *dev_priv);
> void intel_init_runtime_pm(struct drm_i915_private *dev_priv);
> void intel_fini_runtime_pm(struct drm_i915_private *dev_priv);
> void ilk_wm_get_hw_state(struct drm_device *dev);
> -
> +void intel_init_drrs_idleness_detection(struct drm_device *dev,
> + struct intel_connector *connector);
> +void intel_update_drrs(struct drm_device *dev);
> +void intel_disable_drrs(struct drm_device *dev);
>
> /* intel_sdvo.c */
> bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob);
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index fd68f93..6a78fca 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -621,6 +621,144 @@ out_disable:
> i915_gem_stolen_cleanup_compression(dev);
> }
>
> +static void intel_drrs_work_fn(struct work_struct *__work)
> +{
> + struct intel_drrs_work *work =
> + container_of(to_delayed_work(__work),
> + struct intel_drrs_work, work);
> + struct drm_device *dev = work->crtc->dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + /* Double check if the dual-display mode is active. */
> + if (dev_priv->drrs.is_clone)
> + return;
> +
> + intel_dp_set_drrs_state(work->crtc->dev,
> + dev_priv->drrs.connector->panel.downclock_mode->vrefresh);
> +}
> +
> +static void intel_cancel_drrs_work(struct drm_i915_private *dev_priv)
> +{
> + if (dev_priv->drrs.drrs_work == NULL)
> + return;
> +
> + cancel_delayed_work_sync(&dev_priv->drrs.drrs_work->work);
> +}
> +
> +static void intel_enable_drrs(struct drm_crtc *crtc)
> +{
> + struct drm_device *dev = crtc->dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_dp *intel_dp = NULL;
> +
> + intel_dp = enc_to_intel_dp(&dev_priv->drrs.connector->encoder->base);
> +
> + if (intel_dp == NULL)
> + return;
> +
> + intel_cancel_drrs_work(dev_priv);
> +
> + if (intel_dp->drrs_state.refresh_rate_type != DRRS_LOW_RR) {
> + dev_priv->drrs.drrs_work->crtc = crtc;
> +
> + /* Delay the actual enabling to let pageflipping cease and the
> + * display to settle before starting DRRS
> + */
> + schedule_delayed_work(&dev_priv->drrs.drrs_work->work,
> + msecs_to_jiffies(dev_priv->drrs.drrs_work->interval));
> + }
> +}
> +
> +void intel_disable_drrs(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_dp *intel_dp = NULL;
> +
> + if (dev_priv->drrs.connector == NULL)
> + return;
> +
> + intel_dp = enc_to_intel_dp(&dev_priv->drrs.connector->encoder->base);
> +
> + if (intel_dp == NULL)
> + return;
> +
> + /* as part of disable DRRS, reset refresh rate to HIGH_RR */
> + if (intel_dp->drrs_state.refresh_rate_type == DRRS_LOW_RR) {
> + intel_cancel_drrs_work(dev_priv);
> + intel_dp_set_drrs_state(dev,
> + dev_priv->drrs.connector->panel.fixed_mode->vrefresh);
> + }
> +}
> +
> +/**
> + * intel_update_drrs - enable/disable DRRS as needed
> + * @dev: the drm_device
> +*/
> +void intel_update_drrs(struct drm_device *dev)
> +{
> + struct drm_crtc *crtc = NULL, *tmp_crtc;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + /* if drrs.connector is NULL, then drrs_init did not get called.
> + * which means DRRS is not supported.
> + */
> + if (dev_priv->drrs.connector == NULL)
> + return;
> +
> + if (dev_priv->drrs.connector->panel.downclock_mode == NULL)
> + return;
> +
> + list_for_each_entry(tmp_crtc, &dev->mode_config.crtc_list, head) {
> + if (tmp_crtc != NULL && intel_crtc_active(tmp_crtc)) {
I don't think it's possible for tmp_crtc to be NULL here.
> + if (crtc) {
> + DRM_DEBUG_KMS(
> + "more than one pipe active, disabling DRRS\n");
> + dev_priv->drrs.is_clone = true;
> + intel_disable_drrs(dev);
> + return;
> + }
> + crtc = tmp_crtc;
> + }
> + }
> +
> + if (crtc == NULL) {
> + DRM_DEBUG_KMS("DRRS: crtc not initialized\n");
> + return;
> + }
> +
> + dev_priv->drrs.is_clone = false;
> + intel_disable_drrs(dev);
> +
> + /* re-enable idleness detection */
> + intel_enable_drrs(crtc);
> +}
> +
> +void intel_init_drrs_idleness_detection(struct drm_device *dev,
> + struct intel_connector *connector)
> +{
> + struct intel_drrs_work *work;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> +
> + if (i915.drrs_interval == 0) {
> + DRM_INFO("DRRS disable by flag\n");
You've added the module parameter with 0600 permission, i.e. the user
can modify it runtime. What happens if the user boots with
i915.drrs_interval=0 but later sets it to a meaningful value?
I think it will be a useful feature to be able to have drrs disabled by
default at boot, to be enabled later.
> + return;
> + }
> +
> + work = kzalloc(sizeof(struct intel_drrs_work), GFP_KERNEL);
> + if (!work) {
> + DRM_ERROR("Failed to allocate DRRS work structure\n");
> + return;
> + }
> +
> + dev_priv->drrs.connector = connector;
> + dev_priv->drrs.is_clone = false;
> +
> + work->interval = i915.drrs_interval;
> + INIT_DELAYED_WORK(&work->work, intel_drrs_work_fn);
> +
> + dev_priv->drrs.drrs_work = work;
> +}
> +
> static void i915_pineview_get_mem_freq(struct drm_device *dev)
> {
> drm_i915_private_t *dev_priv = dev->dev_private;
> --
> 1.7.9.5
>
--
Jani Nikula, Intel Open Source Technology Center
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