[Intel-gfx] [PATCH v8 7/7] drm/i915/mtl: Add support for PM DEMAND
Imre Deak
imre.deak at intel.com
Mon May 29 16:23:34 UTC 2023
On Fri, May 26, 2023 at 03:50:55PM +0300, Vinod Govindapillai wrote:
> From: Mika Kahola <mika.kahola at intel.com>
>
> MTL introduces a new way to instruct the PUnit with
> power and bandwidth requirements of DE. Add the functionality
> to program the registers and handle waits using interrupts.
> The current wait time for timeouts is programmed for 10 msecs to
> factor in the worst case scenarios. Changes made to use REG_BIT
> for a register that we touched(GEN8_DE_MISC_IER _MMIO).
>
> Wa_14016740474 is added which applies to Xe_LPD+ display
>
> v2: checkpatch warning fixes, simplify program pmdemand part
>
> v3: update to dbufs and pipes values to pmdemand register(stan)
> Removed the macro usage in update_pmdemand_values()
>
> v4: move the pmdemand_pre_plane_update before cdclk update
> pmdemand_needs_update included cdclk params comparisons
> pmdemand_state NULL check (Gustavo)
> pmdemand.o in sorted order in the makefile (Jani)
> update pmdemand misc irq handler loop (Gustavo)
> active phys bitmask and programming correction (Gustavo)
>
> v5: simplify pmdemand_state structure
> simplify methods to find active phys and max port clock
> Timeout in case of previou pmdemand task pending (Gustavo)
>
> v6: rebasing
> updates to max_ddiclk calculations (Gustavo)
> updates to active_phys count method (Gustavo)
>
> v7: use two separate loop to iterate throug old and new
> crtc states to calculate the active phys (Gustavo)
>
> v8: use uniform function names (Gustavo)
>
> Bspec: 66451, 64636, 64602, 64603
> Cc: Matt Atwood <matthew.s.atwood at intel.com>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> Cc: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
> Signed-off-by: Mika Kahola <mika.kahola at intel.com>
> Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
> Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> ---
> drivers/gpu/drm/i915/Makefile | 1 +
> drivers/gpu/drm/i915/display/intel_display.c | 14 +
> .../gpu/drm/i915/display/intel_display_core.h | 9 +
> .../drm/i915/display/intel_display_driver.c | 7 +
> .../gpu/drm/i915/display/intel_display_irq.c | 23 +-
> .../drm/i915/display/intel_display_power.c | 8 +
> drivers/gpu/drm/i915/display/intel_pmdemand.c | 572 ++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_pmdemand.h | 24 +
> drivers/gpu/drm/i915/i915_reg.h | 36 +-
> 9 files changed, 690 insertions(+), 4 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/display/intel_pmdemand.c
> create mode 100644 drivers/gpu/drm/i915/display/intel_pmdemand.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index dd9ca69f4998..358463d02a57 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -273,6 +273,7 @@ i915-y += \
> display/intel_pch_display.o \
> display/intel_pch_refclk.o \
> display/intel_plane_initial.o \
> + display/intel_pmdemand.o \
> display/intel_psr.o \
> display/intel_quirks.o \
> display/intel_sprite.o \
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 0490c6412ab5..b3bb2c607650 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -99,6 +99,7 @@
> #include "intel_pcode.h"
> #include "intel_pipe_crc.h"
> #include "intel_plane_initial.h"
> +#include "intel_pmdemand.h"
> #include "intel_pps.h"
> #include "intel_psr.h"
> #include "intel_sdvo.h"
> @@ -6343,6 +6344,10 @@ int intel_atomic_check(struct drm_device *dev,
> return ret;
> }
>
> + ret = intel_pmdemand_atomic_check(state);
> + if (ret)
> + goto fail;
> +
> ret = intel_atomic_check_crtcs(state);
> if (ret)
> goto fail;
> @@ -6988,6 +6993,14 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
> for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
> crtc->config = new_crtc_state;
>
> + /*
> + * In XE_LPD+ Pmdemand combines many parameters such as voltage index,
> + * plls, cdclk frequency, QGV point selection parameter etc. Voltage
> + * index, cdclk/ddiclk frequencies are supposed to be configured before
> + * the cdclk config is set.
> + */
> + intel_pmdemand_pre_plane_update(state);
> +
> if (state->modeset) {
> drm_atomic_helper_update_legacy_modeset_state(dev, &state->base);
>
> @@ -7107,6 +7120,7 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
> intel_verify_planes(state);
>
> intel_sagv_post_plane_update(state);
> + intel_pmdemand_post_plane_update(state);
>
> drm_atomic_helper_commit_hw_done(&state->base);
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
> index 9f66d734edf6..ae45b2c42eb1 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_core.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_core.h
> @@ -345,6 +345,15 @@ struct intel_display {
> struct intel_global_obj obj;
> } dbuf;
>
> + struct {
> + wait_queue_head_t waitqueue;
> +
> + /* mutex to protect pmdemand programming sequence */
> + struct mutex lock;
> +
> + struct intel_global_obj obj;
> + } pmdemand;
> +
> struct {
> /*
> * dkl.phy_lock protects against concurrent access of the
> diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c
> index 60ce10fc7205..dc8de861339d 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_driver.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
> @@ -47,6 +47,7 @@
> #include "intel_opregion.h"
> #include "intel_overlay.h"
> #include "intel_plane_initial.h"
> +#include "intel_pmdemand.h"
> #include "intel_pps.h"
> #include "intel_quirks.h"
> #include "intel_vga.h"
> @@ -211,6 +212,8 @@ int intel_display_driver_probe_noirq(struct drm_i915_private *i915)
> if (ret < 0)
> goto cleanup_vga;
>
> + intel_pmdemand_init_early(i915);
> +
> intel_power_domains_init_hw(i915, false);
>
> if (!HAS_DISPLAY(i915))
> @@ -240,6 +243,10 @@ int intel_display_driver_probe_noirq(struct drm_i915_private *i915)
> if (ret)
> goto cleanup_vga_client_pw_domain_dmc;
>
> + ret = intel_pmdemand_init(i915);
> + if (ret)
> + goto cleanup_vga_client_pw_domain_dmc;
> +
> init_llist_head(&i915->display.atomic_helper.free_list);
> INIT_WORK(&i915->display.atomic_helper.free_work,
> intel_atomic_helper_free_state_worker);
> diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c
> index 3b2a287d2041..0b3739310f81 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> @@ -18,6 +18,7 @@
> #include "intel_fifo_underrun.h"
> #include "intel_gmbus.h"
> #include "intel_hotplug_irq.h"
> +#include "intel_pmdemand.h"
> #include "intel_psr.h"
> #include "intel_psr_regs.h"
>
> @@ -827,12 +828,27 @@ static u32 gen8_de_pipe_fault_mask(struct drm_i915_private *dev_priv)
> return GEN8_DE_PIPE_IRQ_FAULT_ERRORS;
> }
>
> +static void intel_pmdemand_irq_handler(struct drm_i915_private *dev_priv)
> +{
> + wake_up_all(&dev_priv->display.pmdemand.waitqueue);
> +}
> +
> static void
> gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
> {
> bool found = false;
>
> - if (iir & GEN8_DE_MISC_GSE) {
> + if (DISPLAY_VER(dev_priv) >= 14) {
> + if (iir & (XELPDP_PMDEMAND_RSP |
> + XELPDP_PMDEMAND_RSPTOUT_ERR)) {
> + if (iir & XELPDP_PMDEMAND_RSPTOUT_ERR)
> + drm_dbg(&dev_priv->drm,
> + "Error waiting for Punit PM Demand Response\n");
> +
> + intel_pmdemand_irq_handler(dev_priv);
> + found = true;
> + }
> + } else if (iir & GEN8_DE_MISC_GSE) {
> intel_opregion_asle_intr(dev_priv);
> found = true;
> }
> @@ -1576,7 +1592,10 @@ void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
> if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
> de_port_masked |= BXT_DE_PORT_GMBUS;
>
> - if (DISPLAY_VER(dev_priv) >= 11) {
> + if (DISPLAY_VER(dev_priv) >= 14) {
> + de_misc_masked |= XELPDP_PMDEMAND_RSPTOUT_ERR |
> + XELPDP_PMDEMAND_RSP;
> + } else if (DISPLAY_VER(dev_priv) >= 11) {
> enum port port;
>
> if (intel_bios_is_dsi_present(dev_priv, &port))
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> index 6ed2ece89c3f..b801d93d936a 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> @@ -20,6 +20,7 @@
> #include "intel_mchbar_regs.h"
> #include "intel_pch_refclk.h"
> #include "intel_pcode.h"
> +#include "intel_pmdemand.h"
> #include "intel_pps_regs.h"
> #include "intel_snps_phy.h"
> #include "skl_watermark.h"
> @@ -1085,6 +1086,10 @@ static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
> dev_priv->display.dbuf.enabled_slices =
> intel_enabled_dbuf_slices_mask(dev_priv);
>
> + if (DISPLAY_VER(dev_priv) >= 14)
> + intel_pmdemand_program_dbuf(dev_priv, BIT(DBUF_S1) |
> + dev_priv->display.dbuf.enabled_slices);
Would be better not to recalculate the above mask later in the function.
> +
> /*
> * Just power up at least 1 slice, we will
> * figure out later which slices we have and what we need.
> @@ -1096,6 +1101,9 @@ static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
> static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
> {
> gen9_dbuf_slices_update(dev_priv, 0);
> +
> + if (DISPLAY_VER(dev_priv) >= 14)
> + intel_pmdemand_program_dbuf(dev_priv, 0);
> }
>
> static void gen12_dbuf_slices_config(struct drm_i915_private *dev_priv)
> diff --git a/drivers/gpu/drm/i915/display/intel_pmdemand.c b/drivers/gpu/drm/i915/display/intel_pmdemand.c
> new file mode 100644
> index 000000000000..122ee00ce04b
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/display/intel_pmdemand.c
> @@ -0,0 +1,572 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#include <linux/bitops.h>
> +
> +#include "i915_drv.h"
> +#include "i915_reg.h"
> +#include "intel_bw.h"
> +#include "intel_cdclk.h"
> +#include "intel_cx0_phy.h"
> +#include "intel_de.h"
> +#include "intel_display.h"
> +#include "intel_display_trace.h"
> +#include "intel_pmdemand.h"
> +#include "skl_watermark.h"
> +
> +struct pmdemand_params {
> + u16 qclk_gv_bw;
> + u8 voltage_index;
> + u8 qclk_gv_index;
> + u8 active_pipes;
> + /* Total number of non type C active phys from active_phys_mask */
> + u8 active_phys;
> + u16 cdclk_freq_mhz;
> + /* max from ddi_clocks[]*/
> + u16 ddiclk_max;
> + u8 scalers;
> +};
> +
> +struct intel_pmdemand_state {
> + struct intel_global_state base;
> +
> + /* Maintain a persistent list of port clocks across all crtcs */
> + int ddi_clocks[I915_MAX_PIPES];
> +
> + /* Maintain a persistent list of non type C phys mask */
> + u16 active_phys_mask;
> +
> + /* Parameters to be configured in the pmdemand registers */
> + struct pmdemand_params params;
> +};
> +
> +#define to_intel_pmdemand_state(x) container_of((x), \
> + struct intel_pmdemand_state, \
> + base)
> +static struct intel_global_state *
> +intel_pmdemand_duplicate_state(struct intel_global_obj *obj)
> +{
> + struct intel_pmdemand_state *pmdmnd_state;
The pmdemand_state name is what's used elsewhere.
> +
> + pmdmnd_state = kmemdup(obj->state, sizeof(*pmdmnd_state), GFP_KERNEL);
> + if (!pmdmnd_state)
> + return NULL;
> +
> + return &pmdmnd_state->base;
> +}
> +
> +static void intel_pmdemand_destroy_state(struct intel_global_obj *obj,
> + struct intel_global_state *state)
> +{
> + kfree(state);
> +}
> +
> +static const struct intel_global_state_funcs intel_pmdemand_funcs = {
> + .atomic_duplicate_state = intel_pmdemand_duplicate_state,
> + .atomic_destroy_state = intel_pmdemand_destroy_state,
> +};
> +
> +static struct intel_pmdemand_state *
> +intel_atomic_get_pmdemand_state(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + struct intel_global_state *pmdemand_state =
> + intel_atomic_get_global_obj_state(state,
> + &i915->display.pmdemand.obj);
> +
> + if (IS_ERR(pmdemand_state))
> + return ERR_CAST(pmdemand_state);
> +
> + return to_intel_pmdemand_state(pmdemand_state);
> +}
> +
> +static struct intel_pmdemand_state *
> +intel_atomic_get_old_pmdemand_state(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + struct intel_global_state *pmdemand_state =
> + intel_atomic_get_old_global_obj_state(state,
> + &i915->display.pmdemand.obj);
> +
> + if (!pmdemand_state)
> + return NULL;
> +
> + return to_intel_pmdemand_state(pmdemand_state);
> +}
> +
> +static struct intel_pmdemand_state *
> +intel_atomic_get_new_pmdemand_state(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + struct intel_global_state *pmdemand_state =
> + intel_atomic_get_new_global_obj_state(state,
> + &i915->display.pmdemand.obj);
> +
> + if (!pmdemand_state)
> + return NULL;
> +
> + return to_intel_pmdemand_state(pmdemand_state);
> +}
> +
> +int intel_pmdemand_init(struct drm_i915_private *i915)
> +{
> + struct intel_pmdemand_state *pmdemand_state;
> +
> + pmdemand_state = kzalloc(sizeof(*pmdemand_state), GFP_KERNEL);
> + if (!pmdemand_state)
> + return -ENOMEM;
> +
> + intel_atomic_global_obj_init(i915, &i915->display.pmdemand.obj,
> + &pmdemand_state->base,
> + &intel_pmdemand_funcs);
> +
> + if (IS_MTL_DISPLAY_STEP(i915, STEP_A0, STEP_C0))
> + /* Wa_14016740474 */
> + intel_de_rmw(i915, XELPD_CHICKEN_DCPR_3, 0, DMD_RSP_TIMEOUT_DISABLE);
> +
> + return 0;
> +}
> +
> +void intel_pmdemand_init_early(struct drm_i915_private *i915)
> +{
> + mutex_init(&i915->display.pmdemand.lock);
> + init_waitqueue_head(&i915->display.pmdemand.waitqueue);
> +}
> +
> +static void
> +intel_pmdemand_update_max_ddiclk(struct intel_atomic_state *state,
> + struct intel_pmdemand_state *pmd_state)
> +{
> + int max_ddiclk = 0;
> + struct intel_crtc *crtc;
> + int i;
> + const struct intel_crtc_state *new_crtc_state;
> +
> + for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i)
> + pmd_state->ddi_clocks[crtc->pipe] = new_crtc_state->port_clock;
> +
> + for (i = 0; i < ARRAY_SIZE(pmd_state->ddi_clocks); i++)
> + max_ddiclk = max(pmd_state->ddi_clocks[i], max_ddiclk);
> +
> + pmd_state->params.ddiclk_max = DIV_ROUND_UP(max_ddiclk, 1000);
> +}
> +
> +static struct intel_encoder *
> +intel_pmdemand_get_crtc_old_encoder(const struct intel_atomic_state *state,
> + const struct intel_crtc_state *crtc_state)
> +{
> + const struct drm_connector_state *connector_state;
> + const struct drm_connector *connector;
> + struct intel_encoder *encoder = NULL;
> + struct intel_crtc *master_crtc;
> + int i;
> +
> + master_crtc = intel_master_crtc(crtc_state);
> +
> + for_each_old_connector_in_state(&state->base, connector, connector_state, i) {
> + if (connector_state->crtc != &master_crtc->base)
> + continue;
> +
> + encoder = to_intel_encoder(connector_state->best_encoder);
> + }
> +
> + return encoder;
> +}
> +
> +static void
> +intel_pmdemand_update_active_non_tc_phys(struct drm_i915_private *i915,
> + const struct intel_atomic_state *state,
> + struct intel_pmdemand_state *pmd_state)
> +{
> + struct intel_crtc *crtc;
> + struct intel_encoder *encoder;
> + int i;
> + const struct intel_crtc_state *new_crtc_state, *old_crtc_state;
> + enum phy phy;
> +
> + /*
> + * Active phys are checked using two separate loops - one over old crtc
> + * state to clear the bit from the mask corresponding to the phys which
> + * are active in old crtc state. The other over new crtc state to set
> + * the bit from the mask which are active in new crtc state. This is
> + * intentionally split into two separate loops because the same connector
> + * could be attached to a crtc in old state but to another crtc in a new
> + * state.
> + */
> + for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> + new_crtc_state, i) {
> + if (!intel_crtc_needs_modeset(new_crtc_state))
> + continue;
> +
> + if (!old_crtc_state->hw.active)
> + continue;
> +
> + encoder = intel_pmdemand_get_crtc_old_encoder(state,
> + old_crtc_state);
I think it would be simpler to iterate the connectors instead - which
are guaranteed to be in the atomic state if there is any change in the
PHY configuration - and derive the old/new PHYs from the old/new
connector state in one loop.
> + if (!encoder)
> + continue;
> +
> + phy = intel_port_to_phy(i915, encoder->port);
> +
> + pmd_state->active_phys_mask &= ~BIT(phy);
> + }
> +
> + for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> + new_crtc_state, i) {
> + if (!intel_crtc_needs_modeset(new_crtc_state))
> + continue;
> +
> + if (!new_crtc_state->hw.active)
> + continue;
> +
> + encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
> + if (!encoder)
> + continue;
> +
> + phy = intel_port_to_phy(i915, encoder->port);
> +
> + if (intel_phy_is_tc(i915, phy))
> + continue;
> +
> + pmd_state->active_phys_mask |= BIT(phy);
> + }
> +
> + pmd_state->params.active_phys = hweight16(pmd_state->active_phys_mask);
> +}
> +
> +static bool intel_pmdemand_needs_update(struct intel_atomic_state *state)
> +{
> + bool states_checked = false;
> + struct intel_crtc *crtc;
> + int i;
> + const struct intel_crtc_state *new_crtc_state, *old_crtc_state;
> +
> + for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> + new_crtc_state, i) {
> + const struct intel_bw_state *new_bw_state, *old_bw_state;
> + const struct intel_cdclk_state *new_cdclk_state;
> + const struct intel_cdclk_state *old_cdclk_state;
> + const struct intel_dbuf_state *new_dbuf_state, *old_dbuf_state;
> +
> + if (old_crtc_state->port_clock != new_crtc_state->port_clock)
> + return true;
The function should also check if the PHY configuration changes.
> +
> + /*
> + * For the below settings once through the loop is enough.
> + * Some pmdemand_atomic_check calls might trigger read lock not
> + * taken assert if these following checks are kept outside this
> + * loop.
> + */
Where did the assert come from? I suppose you refer to
assert_global_state_read_locked(), but I can't see how that can trigger
if this function returns true.
> + if (states_checked)
> + continue;
> +
> + new_bw_state = intel_atomic_get_new_bw_state(state);
> + old_bw_state = intel_atomic_get_old_bw_state(state);
> + if (new_bw_state && new_bw_state->qgv_point_peakbw !=
> + old_bw_state->qgv_point_peakbw)
> + return true;
> +
> + new_dbuf_state = intel_atomic_get_new_dbuf_state(state);
> + old_dbuf_state = intel_atomic_get_old_dbuf_state(state);
> + if (new_dbuf_state && new_dbuf_state->active_pipes !=
> + old_dbuf_state->active_pipes)
> + return true;
> +
> + new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
> + old_cdclk_state = intel_atomic_get_old_cdclk_state(state);
> + if (new_cdclk_state &&
> + (new_cdclk_state->logical.cdclk !=
> + old_cdclk_state->logical.cdclk ||
> + new_cdclk_state->logical.voltage_level !=
> + old_cdclk_state->logical.voltage_level))
Why is the above checking the logical and not the actual cdclk state?
> + return true;
> +
> + states_checked = true;
> + }
> +
> + return false;
> +}
> +
> +int intel_pmdemand_atomic_check(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + const struct intel_bw_state *new_bw_state;
> + const struct intel_cdclk_state *new_cdclk_state;
> + const struct intel_dbuf_state *new_dbuf_state;
> + struct intel_pmdemand_state *new_pmdemand_state;
> + int ret;
> +
> + if (DISPLAY_VER(i915) < 14)
> + return 0;
> +
> + if (!intel_pmdemand_needs_update(state))
> + return 0;
> +
> + new_pmdemand_state = intel_atomic_get_pmdemand_state(state);
> + if (IS_ERR(new_pmdemand_state))
> + return PTR_ERR(new_pmdemand_state);
> +
> + ret = intel_atomic_lock_global_state(&new_pmdemand_state->base);
> + if (ret)
> + return ret;
> +
> + new_bw_state = intel_atomic_get_bw_state(state);
> + if (IS_ERR(new_bw_state))
> + return PTR_ERR(new_bw_state);
> +
> + /* firmware will calculate the qclck_gc_index, requirement is set to 0 */
> + new_pmdemand_state->params.qclk_gv_index = 0;
> + new_pmdemand_state->params.qclk_gv_bw =
> + min_t(u16, new_bw_state->qgv_point_peakbw, 0xffff);
> +
> + new_dbuf_state = intel_atomic_get_dbuf_state(state);
> + if (IS_ERR(new_dbuf_state))
> + return PTR_ERR(new_dbuf_state);
> +
> + new_pmdemand_state->params.active_pipes =
> + min_t(u8, hweight8(new_dbuf_state->active_pipes), 3);
> +
> + new_cdclk_state = intel_atomic_get_cdclk_state(state);
> + if (IS_ERR(new_cdclk_state))
> + return PTR_ERR(new_cdclk_state);
> +
> + new_pmdemand_state->params.voltage_index =
> + new_cdclk_state->logical.voltage_level;
> + new_pmdemand_state->params.cdclk_freq_mhz =
> + DIV_ROUND_UP(new_cdclk_state->logical.cdclk, 1000);
> +
> + intel_pmdemand_update_max_ddiclk(state, new_pmdemand_state);
> +
> + intel_pmdemand_update_active_non_tc_phys(i915, state, new_pmdemand_state);
> +
> + /*
> + * Setting scalers to max as it can not be calculated during flips and
> + * fastsets without taking global states locks.
> + */
> + new_pmdemand_state->params.scalers = 7;
> +
> + ret = intel_atomic_serialize_global_state(&new_pmdemand_state->base);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static bool intel_pmdemand_check_prev_transaction(struct drm_i915_private *i915)
> +{
> + return !(intel_de_wait_for_clear(i915,
> + XELPDP_INITIATE_PMDEMAND_REQUEST(1),
> + XELPDP_PMDEMAND_REQ_ENABLE, 10) ||
> + intel_de_wait_for_clear(i915,
> + GEN12_DCPR_STATUS_1,
> + XELPDP_PMDEMAND_INFLIGHT_STATUS, 10));
> +}
> +
> +static bool intel_pmdemand_req_complete(struct drm_i915_private *i915)
> +{
> + return !(intel_de_read(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(1)) &
> + XELPDP_PMDEMAND_REQ_ENABLE);
> +}
> +
> +static int intel_pmdemand_wait(struct drm_i915_private *i915)
The return value is not used anywhere, so could be just a void fn.
> +{
> + int ret;
> + const unsigned int timeout_ms = 10;
> +
> + ret = wait_event_timeout(i915->display.pmdemand.waitqueue,
> + intel_pmdemand_req_complete(i915),
> + msecs_to_jiffies_timeout(timeout_ms));
> + if (ret == 0)
> + drm_err(&i915->drm,
> + "timed out waiting for Punit PM Demand Response\n");
Could be simply if (!wait_event_timeout(...)) drm_err(...);
> +
> + return ret;
> +}
> +
> +/* Required to be programmed during Display Init Sequences. */
> +void intel_pmdemand_program_dbuf(struct drm_i915_private *i915,
> + u8 dbuf_slices)
> +{
> + u32 dbufs = min_t(u32, hweight8(dbuf_slices), 3);
> +
> + mutex_lock(&i915->display.pmdemand.lock);
> + if (drm_WARN_ON(&i915->drm,
> + !intel_pmdemand_check_prev_transaction(i915)))
> + goto unlock;
> +
> + intel_de_rmw(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(0),
> + XELPDP_PMDEMAND_DBUFS_MASK, XELPDP_PMDEMAND_DBUFS(dbufs));
> + intel_de_rmw(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(1), 0,
> + XELPDP_PMDEMAND_REQ_ENABLE);
> +
> + intel_pmdemand_wait(i915);
> +
> +unlock:
> + mutex_unlock(&i915->display.pmdemand.lock);
> +}
> +
> +static void
> +intel_pmdemand_update_params(const struct intel_pmdemand_state *new,
> + const struct intel_pmdemand_state *old,
> + u32 *reg1, u32 *reg2)
> +{
> + u32 plls, tmp;
> +
> + /*
> + * The pmdemand parameter updates happens in two steps. Pre plane and
> + * post plane updates. During the pre plane, as DE might still be
> + * handling with some old operations, to avoid unwanted performance
> + * issues, program the pmdemand parameters with higher of old and new
> + * values. And then after once settled, use the new parameter values
> + * as part of the post plane update.
> + */
> +
> + /* Set 1*/
> + *reg1 &= ~XELPDP_PMDEMAND_QCLK_GV_BW_MASK;
> + tmp = old ? max(old->params.qclk_gv_bw, new->params.qclk_gv_bw) :
> + new->params.qclk_gv_bw;
> + *reg1 |= XELPDP_PMDEMAND_QCLK_GV_BW(tmp);
> +
> + *reg1 &= ~XELPDP_PMDEMAND_VOLTAGE_INDEX_MASK;
> + tmp = old ? max(old->params.voltage_index, new->params.voltage_index) :
> + new->params.voltage_index;
> + *reg1 |= XELPDP_PMDEMAND_VOLTAGE_INDEX(tmp);
> +
> + *reg1 &= ~XELPDP_PMDEMAND_QCLK_GV_INDEX_MASK;
> + tmp = old ? max(old->params.qclk_gv_index, new->params.qclk_gv_index) :
> + new->params.qclk_gv_index;
> + *reg1 |= XELPDP_PMDEMAND_QCLK_GV_INDEX(tmp);
> +
> + *reg1 &= ~XELPDP_PMDEMAND_PIPES_MASK;
> + tmp = old ? max(old->params.active_pipes, new->params.active_pipes) :
> + new->params.active_pipes;
> + *reg1 |= XELPDP_PMDEMAND_PIPES(tmp);
> +
> + *reg1 &= ~XELPDP_PMDEMAND_PHYS_MASK;
> + plls = old ? max(old->params.active_phys, new->params.active_phys) :
> + new->params.active_phys;
> + plls = min_t(u32, plls, 7);
> + *reg1 |= XELPDP_PMDEMAND_PHYS(plls);
Programming the active DBUFs is missing (in case that changes anytime
after gen9_dbuf_enable()).
> +
> + /* Set 2*/
> + *reg2 &= ~XELPDP_PMDEMAND_CDCLK_FREQ_MASK;
> + tmp = old ? max(old->params.cdclk_freq_mhz,
> + new->params.cdclk_freq_mhz) :
> + new->params.cdclk_freq_mhz;
> + *reg2 |= XELPDP_PMDEMAND_CDCLK_FREQ(tmp);
> +
> + *reg2 &= ~XELPDP_PMDEMAND_DDICLK_FREQ_MASK;
> + tmp = old ? max(old->params.ddiclk_max, new->params.ddiclk_max) :
> + new->params.ddiclk_max;
> + *reg2 |= XELPDP_PMDEMAND_DDICLK_FREQ(tmp);
> +
> + *reg2 &= ~XELPDP_PMDEMAND_SCALERS_MASK;
> + tmp = old ? max(old->params.scalers, new->params.scalers) :
> + new->params.scalers;
> + *reg2 |= XELPDP_PMDEMAND_SCALERS(tmp);
> +
> + /*
> + * Active_PLLs starts with 1 because of CDCLK PLL.
> + * TODO: Missing to account genlock filter when it gets used.
> + */
> + plls = min_t(u32, plls + 1, 7);
> + *reg2 &= ~XELPDP_PMDEMAND_PLLS_MASK;
> + *reg2 |= XELPDP_PMDEMAND_PLLS(plls);
> +}
> +
> +static void
> +intel_pmdemand_program_params(struct drm_i915_private *i915,
> + const struct intel_pmdemand_state *new,
> + const struct intel_pmdemand_state *old)
> +{
> + bool changed = false;
> + u32 reg1, mod_reg1;
> + u32 reg2, mod_reg2;
> +
> + mutex_lock(&i915->display.pmdemand.lock);
> + if (drm_WARN_ON(&i915->drm,
> + !intel_pmdemand_check_prev_transaction(i915)))
> + goto unlock;
> +
> + reg1 = intel_de_read(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(0));
> + mod_reg1 = reg1;
> +
> + reg2 = intel_de_read(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(1));
> + mod_reg2 = reg2;
> +
> + intel_pmdemand_update_params(new, old, &mod_reg1, &mod_reg2);
> +
> + if (reg1 != mod_reg1) {
> + intel_de_write(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(0),
> + mod_reg1);
> + changed = true;
> + }
> +
> + if (reg2 != mod_reg2) {
> + intel_de_write(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(1),
> + mod_reg2);
> + changed = true;
> + }
> +
> + /* Initiate pm demand request only if register values are changed */
> + if (!changed)
> + goto unlock;
> +
> + drm_dbg_kms(&i915->drm,
> + "initate pmdemand request values: (0x%x 0x%x)\n",
> + mod_reg1, mod_reg2);
> +
> + intel_de_rmw(i915, XELPDP_INITIATE_PMDEMAND_REQUEST(1), 0,
> + XELPDP_PMDEMAND_REQ_ENABLE);
> +
> + intel_pmdemand_wait(i915);
> +
> +unlock:
> + mutex_unlock(&i915->display.pmdemand.lock);
> +}
> +
> +static bool
> +intel_pmdemand_state_changed(const struct intel_pmdemand_state *new,
> + const struct intel_pmdemand_state *old)
> +{
> + return memcmp(&new->params, &old->params, sizeof(new->params)) != 0;
> +}
> +
> +void intel_pmdemand_pre_plane_update(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + const struct intel_pmdemand_state *new_pmdmnd_state =
> + intel_atomic_get_new_pmdemand_state(state);
> + const struct intel_pmdemand_state *old_pmdmnd_state =
> + intel_atomic_get_old_pmdemand_state(state);
The pmdemand_state name is used elsewhere.
> +
> + if (DISPLAY_VER(i915) < 14)
> + return;
> +
> + if (!new_pmdmnd_state ||
> + !intel_pmdemand_state_changed(new_pmdmnd_state, old_pmdmnd_state))
> + return;
There should be an assert here that the pmdemand object state got
actually updated (new_pmdemand_state->base.changed).
> +
> + intel_pmdemand_program_params(i915, new_pmdmnd_state,
> + old_pmdmnd_state);
> +}
> +
> +void intel_pmdemand_post_plane_update(struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *i915 = to_i915(state->base.dev);
> + const struct intel_pmdemand_state *new_pmdmnd_state =
> + intel_atomic_get_new_pmdemand_state(state);
> + const struct intel_pmdemand_state *old_pmdmnd_state =
> + intel_atomic_get_old_pmdemand_state(state);
> +
> + if (DISPLAY_VER(i915) < 14)
> + return;
> +
> + if (!new_pmdmnd_state ||
> + !intel_pmdemand_state_changed(new_pmdmnd_state, old_pmdmnd_state))
> + return;
The same assert as above is missing from here.
> +
> + intel_pmdemand_program_params(i915, new_pmdmnd_state, NULL);
> +}
Setting up the initial pmdemand state after HW readout is missing,
should be added somewhere in intel_modeset_readout_hw_state().
> diff --git a/drivers/gpu/drm/i915/display/intel_pmdemand.h b/drivers/gpu/drm/i915/display/intel_pmdemand.h
> new file mode 100644
> index 000000000000..fa7a601ddafa
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/display/intel_pmdemand.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#ifndef __INTEL_PMDEMAND_H__
> +#define __INTEL_PMDEMAND_H__
> +
> +#include <linux/types.h>
> +
> +struct drm_i915_private;
> +struct intel_atomic_state;
> +struct intel_crtc_state;
> +struct intel_plane_state;
> +
> +void intel_pmdemand_init_early(struct drm_i915_private *i915);
> +int intel_pmdemand_init(struct drm_i915_private *i915);
> +void intel_pmdemand_program_dbuf(struct drm_i915_private *i915,
> + u8 dbuf_slices);
> +void intel_pmdemand_pre_plane_update(struct intel_atomic_state *state);
> +void intel_pmdemand_post_plane_update(struct intel_atomic_state *state);
> +int intel_pmdemand_atomic_check(struct intel_atomic_state *state);
> +
> +#endif /* __INTEL_PMDEMAND_H__ */
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 2a9ab8de8421..91fb12b65c92 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4450,8 +4450,10 @@
> #define GEN8_DE_MISC_IMR _MMIO(0x44464)
> #define GEN8_DE_MISC_IIR _MMIO(0x44468)
> #define GEN8_DE_MISC_IER _MMIO(0x4446c)
> -#define GEN8_DE_MISC_GSE (1 << 27)
> -#define GEN8_DE_EDP_PSR (1 << 19)
> +#define XELPDP_PMDEMAND_RSPTOUT_ERR REG_BIT(27)
> +#define GEN8_DE_MISC_GSE REG_BIT(27)
> +#define GEN8_DE_EDP_PSR REG_BIT(19)
> +#define XELPDP_PMDEMAND_RSP REG_BIT(3)
>
> #define GEN8_PCU_ISR _MMIO(0x444e0)
> #define GEN8_PCU_IMR _MMIO(0x444e4)
> @@ -4536,6 +4538,33 @@
> #define XELPDP_DP_ALT_HPD_LONG_DETECT REG_BIT(1)
> #define XELPDP_DP_ALT_HPD_SHORT_DETECT REG_BIT(0)
>
> +#define XELPDP_INITIATE_PMDEMAND_REQUEST(dword) _MMIO(0x45230 + 4 * (dword))
> +#define XELPDP_PMDEMAND_QCLK_GV_BW_MASK REG_GENMASK(31, 16)
> +#define XELPDP_PMDEMAND_QCLK_GV_BW(x) REG_FIELD_PREP(XELPDP_PMDEMAND_QCLK_GV_BW_MASK, x)
> +#define XELPDP_PMDEMAND_VOLTAGE_INDEX_MASK REG_GENMASK(14, 12)
> +#define XELPDP_PMDEMAND_VOLTAGE_INDEX(x) REG_FIELD_PREP(XELPDP_PMDEMAND_VOLTAGE_INDEX_MASK, x)
> +#define XELPDP_PMDEMAND_QCLK_GV_INDEX_MASK REG_GENMASK(11, 8)
> +#define XELPDP_PMDEMAND_QCLK_GV_INDEX(x) REG_FIELD_PREP(XELPDP_PMDEMAND_QCLK_GV_INDEX_MASK, x)
> +#define XELPDP_PMDEMAND_PIPES_MASK REG_GENMASK(7, 6)
> +#define XELPDP_PMDEMAND_PIPES(x) REG_FIELD_PREP(XELPDP_PMDEMAND_PIPES_MASK, x)
> +#define XELPDP_PMDEMAND_DBUFS_MASK REG_GENMASK(5, 4)
> +#define XELPDP_PMDEMAND_DBUFS(x) REG_FIELD_PREP(XELPDP_PMDEMAND_DBUFS_MASK, x)
> +#define XELPDP_PMDEMAND_PHYS_MASK REG_GENMASK(2, 0)
> +#define XELPDP_PMDEMAND_PHYS(x) REG_FIELD_PREP(XELPDP_PMDEMAND_PHYS_MASK, x)
> +
> +#define XELPDP_PMDEMAND_REQ_ENABLE REG_BIT(31)
> +#define XELPDP_PMDEMAND_CDCLK_FREQ_MASK REG_GENMASK(30, 20)
> +#define XELPDP_PMDEMAND_CDCLK_FREQ(x) REG_FIELD_PREP(XELPDP_PMDEMAND_CDCLK_FREQ_MASK, x)
> +#define XELPDP_PMDEMAND_DDICLK_FREQ_MASK REG_GENMASK(18, 8)
> +#define XELPDP_PMDEMAND_DDICLK_FREQ(x) REG_FIELD_PREP(XELPDP_PMDEMAND_DDICLK_FREQ_MASK, x)
> +#define XELPDP_PMDEMAND_SCALERS_MASK REG_GENMASK(6, 4)
> +#define XELPDP_PMDEMAND_SCALERS(x) REG_FIELD_PREP(XELPDP_PMDEMAND_SCALERS_MASK, x)
> +#define XELPDP_PMDEMAND_PLLS_MASK REG_GENMASK(2, 0)
> +#define XELPDP_PMDEMAND_PLLS(x) REG_FIELD_PREP(XELPDP_PMDEMAND_PLLS_MASK, x)
> +
> +#define GEN12_DCPR_STATUS_1 _MMIO(0x46440)
> +#define XELPDP_PMDEMAND_INFLIGHT_STATUS REG_BIT(26)
> +
> #define ILK_DISPLAY_CHICKEN2 _MMIO(0x42004)
> /* Required on all Ironlake and Sandybridge according to the B-Spec. */
> #define ILK_ELPIN_409_SELECT REG_BIT(25)
> @@ -4695,6 +4724,9 @@
> #define DCPR_SEND_RESP_IMM REG_BIT(25)
> #define DCPR_CLEAR_MEMSTAT_DIS REG_BIT(24)
>
> +#define XELPD_CHICKEN_DCPR_3 _MMIO(0x46438)
> +#define DMD_RSP_TIMEOUT_DISABLE REG_BIT(19)
> +
> #define SKL_DFSM _MMIO(0x51000)
> #define SKL_DFSM_DISPLAY_PM_DISABLE (1 << 27)
> #define SKL_DFSM_DISPLAY_HDCP_DISABLE (1 << 25)
> --
> 2.34.1
>
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