| Message ID | 20241104091257.731388-1-suraj.kandpal@intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | drm/i915/psr: Implement WA to help reach PC10 | expand |
On Mon, 04 Nov 2024, Suraj Kandpal <suraj.kandpal@intel.com> wrote: > To reach PC10 when PKG_C_LATENCY is configure we must do the following > things > 1) Enter PSR1 only when delayed_vblank < 6 lines and DC5 can be entered > 2) Allow PSR2 deep sleep when DC5 can be entered > 3) DC5 can be entered when all transocoder have either PSR1, PSR2 or > eDP 1.5 PR ALPM enabled and VBI is disabled and flips and pushes are > not happening. > > --v2 > -Add debug prints > > --v3 > -use crtc as variable name for intel_crtc [Jani] > -use encoder as variable name for intel_encoder [Jani] > -No changes in intel_dp in compute_config_late [Jani] > > --v4 > -Remove "check" from naming [Jani] > -Remove intel_encoder variable which is not necessary in > compute_config_late > > WA: 22019444797 > Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com> > --- > drivers/gpu/drm/i915/display/intel_ddi.c | 3 + > .../drm/i915/display/intel_display_types.h | 6 + > drivers/gpu/drm/i915/display/intel_psr.c | 130 +++++++++++++++++- > drivers/gpu/drm/i915/display/intel_psr.h | 1 + > 4 files changed, 139 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c > index 0535daed6a9f..8e0fb6bd6211 100644 > --- a/drivers/gpu/drm/i915/display/intel_ddi.c > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c > @@ -4403,6 +4403,9 @@ static int intel_ddi_compute_config_late(struct intel_encoder *encoder, > port_sync_transcoders & ~BIT(crtc_state->cpu_transcoder); > } > > + if (intel_encoder_is_dp(encoder)) > + intel_psr_compute_config_late(crtc_state); > + > return 0; > } > > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h > index ff6eb93337e0..dd5f3ea90e5b 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_types.h > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h > @@ -1089,6 +1089,9 @@ struct intel_crtc_state { > bool req_psr2_sdp_prior_scanline; > bool has_panel_replay; > bool wm_level_disabled; > + bool is_wa_delayed_vblank_limit; > + bool is_dpkgc_configured; > + bool is_dc5_entry_possible; > u32 dc3co_exitline; > u16 su_y_granularity; > > @@ -1587,6 +1590,9 @@ struct intel_psr { > #define I915_PSR_DEBUG_PANEL_REPLAY_DISABLE 0x40 > > u32 debug; > + bool is_dpkgc_configured; > + bool is_dc5_entry_possible; > + bool is_wa_delayed_vblank_limit; I don't understand why all of these need to be duplicated in struct intel_psr. I get that you don't necessarily have access to the crtc state in all circumstances. But doesn't the workaround basically boil down to using 0 idle frames in hsw_activate_psr2()? > bool sink_support; > bool source_support; > bool enabled; > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c > index a784c0b81556..b93358a82aa3 100644 > --- a/drivers/gpu/drm/i915/display/intel_psr.c > +++ b/drivers/gpu/drm/i915/display/intel_psr.c > @@ -26,6 +26,7 @@ > #include <drm/drm_atomic_helper.h> > #include <drm/drm_damage_helper.h> > #include <drm/drm_debugfs.h> > +#include <drm/drm_vblank.h> > > #include "i915_drv.h" > #include "i915_reg.h" > @@ -898,6 +899,81 @@ static u8 psr_compute_idle_frames(struct intel_dp *intel_dp) > return idle_frames; > } > > +static bool > +intel_psr_wa_delayed_vblank(const struct drm_display_mode *adjusted_mode) > +{ > + return (adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay) >= 6; > +} > + > +/* > + * PKG_C_LATENCY is configured only when DISPLAY_VER >= 20 and > + * VRR is not enabled > + */ > +static bool intel_psr_is_dpkgc_configured(struct intel_display *display, > + struct intel_crtc_state *crtc_state) > +{ > + if (DISPLAY_VER(display) < 20 || crtc_state->vrr.enable) > + return false; > + > + return true; IOW, return DISPLAY_VER(display) >= 20 && !crtc_state->vrr.enable; > +} > + > +static bool wa_22019444797_psr1(const struct intel_crtc_state *crtc_state, > + struct intel_psr *psr) I really dislike function names like this. It doesn't say *anything* to the reader. It's hard to pronounce. It's hard to talk about. I don't know what it means. Something like psr1_needs_wa_22019444797() is already much better, even if it still contains the wa number. It tells what it's about, and the reader doesn't have to try to guess. > +{ > + struct intel_display *display = to_intel_display(crtc_state); > + > + if (DISPLAY_VER(display) == 20 && psr->is_dpkgc_configured && > + (psr->is_wa_delayed_vblank_limit || !psr->is_dc5_entry_possible) && > + !crtc_state->has_sel_update && !crtc_state->has_panel_replay) { > + drm_dbg_kms(display->drm, > + "Wa 22019444797 requirement met PSR1 disabled\n"); That debug log message is not a sentence. Maybe something like, "Disabling PSR1 due to wa 22019444797\n". > + return true; > + } else { > + return false; > + } > +} Why is this function looking at struct intel_psr to make decisions? Shouldn't it use old and new crtc state, and nothing else? > + > +/* > + * DC5 entry is only possible if vblank interrupt is disabled > + * and either psr1, psr2, edp 1.5 pr alpm is enabled on all > + * enabled encoders. > + */ > +static bool > +intel_psr_is_dc5_entry_possible(struct intel_display *display, > + struct intel_crtc_state *crtc_state) > +{ > + struct intel_crtc *crtc; > + > + if ((display->power.domains.target_dc_state & > + DC_STATE_EN_UPTO_DC5_DC6_MASK) == 0) > + return false; > + > + if (!crtc_state->has_psr && !crtc_state->has_sel_update && > + !crtc_state->has_panel_replay) > + return false; > + > + for_each_intel_crtc(display->drm, crtc) { > + struct drm_vblank_crtc *vblank; > + struct intel_encoder *encoder; > + > + if (!crtc->active) > + continue; > + > + vblank = drm_crtc_vblank_crtc(&crtc->base); > + > + if (vblank->enabled) > + return false; > + > + for_each_encoder_on_crtc(display->drm, &crtc->base, encoder) > + if (encoder->type != INTEL_OUTPUT_EDP || > + !CAN_PSR(enc_to_intel_dp(encoder))) > + return false; > + } > + > + return true; > +} > + > static void hsw_activate_psr1(struct intel_dp *intel_dp) > { > struct intel_display *display = to_intel_display(intel_dp); > @@ -1010,7 +1086,18 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp) > u32 val = EDP_PSR2_ENABLE; > u32 psr_val = 0; > > - val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp)); > + /* > + * Wa_22019444797 > + * TODO: Disable idle frames when vblank gets enabled while > + * PSR2 is enabled > + */ > + if (DISPLAY_VER(dev_priv) != 20 || > + !intel_dp->psr.is_dpkgc_configured || > + intel_dp->psr.is_dc5_entry_possible) > + val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp)); > + else > + drm_dbg_kms(display->drm, > + "Wa 22019444797 requirement met PSR2 deep sleep disabled\n"); What if this was just something like, if (!intel_dp->psr.disable_idle_frames) val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp)); And that was set where needed, and everything else was based on old/new crtc state. I'm just feeling really dumb because it's hard for me to follow what's going on here in this patch. Is it really this complicated? > > if (DISPLAY_VER(display) < 14 && !IS_ALDERLAKE_P(dev_priv)) > val |= EDP_SU_TRACK_ENABLE; > @@ -1692,6 +1779,20 @@ void intel_psr_compute_config(struct intel_dp *intel_dp, > crtc_state->has_sel_update = intel_sel_update_config_valid(intel_dp, crtc_state); > } > > +void intel_psr_compute_config_late(struct intel_crtc_state *crtc_state) > +{ > + struct intel_display *display = to_intel_display(crtc_state); > + > + if (DISPLAY_VER(display) == 20) { > + crtc_state->is_dpkgc_configured = > + intel_psr_is_dpkgc_configured(display, crtc_state); > + crtc_state->is_dc5_entry_possible = > + intel_psr_is_dc5_entry_possible(display, crtc_state); > + crtc_state->is_wa_delayed_vblank_limit = > + intel_psr_wa_delayed_vblank(&crtc_state->hw.adjusted_mode); > + } > +} > + > void intel_psr_get_config(struct intel_encoder *encoder, > struct intel_crtc_state *pipe_config) > { > @@ -2774,6 +2875,22 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state, > return 0; > } > > +static void > +wa_22019444797_fill_psr_params(const struct intel_crtc_state *crtc_state, > + struct intel_psr *psr) Again, that's a horrible function name. This doesn't have to include the workaround number in any way. The rule of thumb: Say the function name aloud, as if you were discussing the code with someone. If it's difficult to talk about, it's probably not a good name. > +{ > + struct intel_display *display = to_intel_display(crtc_state); > + > + if (DISPLAY_VER(display) == 20) { I think this part is independent of display version. > + psr->is_dpkgc_configured = > + crtc_state->is_dpkgc_configured; > + psr->is_dc5_entry_possible = > + crtc_state->is_dc5_entry_possible; > + psr->is_wa_delayed_vblank_limit = > + crtc_state->is_wa_delayed_vblank_limit; > + } > +} Again, why do we need all of this duplicated? I think it only boils down to just one thing in struct intel_psr, unless I'm mistaken. > + > void intel_psr_pre_plane_update(struct intel_atomic_state *state, > struct intel_crtc *crtc) > { > @@ -2796,6 +2913,8 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state, > > mutex_lock(&psr->lock); > > + wa_22019444797_fill_psr_params(new_crtc_state, psr); > + So you're filling stuff from new_crtc_state into psr. > /* > * Reasons to disable: > * - PSR disabled in new state > @@ -2803,6 +2922,7 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state, > * - Changing between PSR versions > * - Region Early Transport changing > * - Display WA #1136: skl, bxt > + * - Display WA_22019444797 > */ > needs_to_disable |= intel_crtc_needs_modeset(new_crtc_state); > needs_to_disable |= !new_crtc_state->has_psr; > @@ -2812,6 +2932,8 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state, > psr->su_region_et_enabled; > needs_to_disable |= DISPLAY_VER(i915) < 11 && > new_crtc_state->wm_level_disabled; > + /* TODO: Disable PSR1 when vblank gets enabled while PSR1 is enabled */ > + needs_to_disable |= wa_22019444797_psr1(new_crtc_state, psr); And then use it here. I don't get it. > > if (psr->enabled && needs_to_disable) > intel_psr_disable_locked(intel_dp); > @@ -2852,6 +2974,12 @@ void intel_psr_post_plane_update(struct intel_atomic_state *state, > keep_disabled |= DISPLAY_VER(display) < 11 && > crtc_state->wm_level_disabled; > > + /* > + * Wa_22019444797 > + * TODO: Disable PSR1 when vblank gets enabled while PSR1 is enabled > + */ > + keep_disabled |= wa_22019444797_psr1(crtc_state, psr); So this carries it over from pre plane update new crtc state via psr... but it's all very confusing. BR, Jani. > + > if (!psr->enabled && !keep_disabled) > intel_psr_enable_locked(intel_dp, crtc_state); > else if (psr->enabled && !crtc_state->wm_level_disabled) > diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h > index 956be263c09e..0923a2f74901 100644 > --- a/drivers/gpu/drm/i915/display/intel_psr.h > +++ b/drivers/gpu/drm/i915/display/intel_psr.h > @@ -47,6 +47,7 @@ void intel_psr_init(struct intel_dp *intel_dp); > void intel_psr_compute_config(struct intel_dp *intel_dp, > struct intel_crtc_state *crtc_state, > struct drm_connector_state *conn_state); > +void intel_psr_compute_config_late(struct intel_crtc_state *crtc_state); > void intel_psr_get_config(struct intel_encoder *encoder, > struct intel_crtc_state *pipe_config); > void intel_psr_irq_handler(struct intel_dp *intel_dp, u32 psr_iir);
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 0535daed6a9f..8e0fb6bd6211 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4403,6 +4403,9 @@ static int intel_ddi_compute_config_late(struct intel_encoder *encoder, port_sync_transcoders & ~BIT(crtc_state->cpu_transcoder); } + if (intel_encoder_is_dp(encoder)) + intel_psr_compute_config_late(crtc_state); + return 0; } diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h index ff6eb93337e0..dd5f3ea90e5b 100644 --- a/drivers/gpu/drm/i915/display/intel_display_types.h +++ b/drivers/gpu/drm/i915/display/intel_display_types.h @@ -1089,6 +1089,9 @@ struct intel_crtc_state { bool req_psr2_sdp_prior_scanline; bool has_panel_replay; bool wm_level_disabled; + bool is_wa_delayed_vblank_limit; + bool is_dpkgc_configured; + bool is_dc5_entry_possible; u32 dc3co_exitline; u16 su_y_granularity; @@ -1587,6 +1590,9 @@ struct intel_psr { #define I915_PSR_DEBUG_PANEL_REPLAY_DISABLE 0x40 u32 debug; + bool is_dpkgc_configured; + bool is_dc5_entry_possible; + bool is_wa_delayed_vblank_limit; bool sink_support; bool source_support; bool enabled; diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c index a784c0b81556..b93358a82aa3 100644 --- a/drivers/gpu/drm/i915/display/intel_psr.c +++ b/drivers/gpu/drm/i915/display/intel_psr.c @@ -26,6 +26,7 @@ #include <drm/drm_atomic_helper.h> #include <drm/drm_damage_helper.h> #include <drm/drm_debugfs.h> +#include <drm/drm_vblank.h> #include "i915_drv.h" #include "i915_reg.h" @@ -898,6 +899,81 @@ static u8 psr_compute_idle_frames(struct intel_dp *intel_dp) return idle_frames; } +static bool +intel_psr_wa_delayed_vblank(const struct drm_display_mode *adjusted_mode) +{ + return (adjusted_mode->crtc_vblank_start - adjusted_mode->crtc_vdisplay) >= 6; +} + +/* + * PKG_C_LATENCY is configured only when DISPLAY_VER >= 20 and + * VRR is not enabled + */ +static bool intel_psr_is_dpkgc_configured(struct intel_display *display, + struct intel_crtc_state *crtc_state) +{ + if (DISPLAY_VER(display) < 20 || crtc_state->vrr.enable) + return false; + + return true; +} + +static bool wa_22019444797_psr1(const struct intel_crtc_state *crtc_state, + struct intel_psr *psr) +{ + struct intel_display *display = to_intel_display(crtc_state); + + if (DISPLAY_VER(display) == 20 && psr->is_dpkgc_configured && + (psr->is_wa_delayed_vblank_limit || !psr->is_dc5_entry_possible) && + !crtc_state->has_sel_update && !crtc_state->has_panel_replay) { + drm_dbg_kms(display->drm, + "Wa 22019444797 requirement met PSR1 disabled\n"); + return true; + } else { + return false; + } +} + +/* + * DC5 entry is only possible if vblank interrupt is disabled + * and either psr1, psr2, edp 1.5 pr alpm is enabled on all + * enabled encoders. + */ +static bool +intel_psr_is_dc5_entry_possible(struct intel_display *display, + struct intel_crtc_state *crtc_state) +{ + struct intel_crtc *crtc; + + if ((display->power.domains.target_dc_state & + DC_STATE_EN_UPTO_DC5_DC6_MASK) == 0) + return false; + + if (!crtc_state->has_psr && !crtc_state->has_sel_update && + !crtc_state->has_panel_replay) + return false; + + for_each_intel_crtc(display->drm, crtc) { + struct drm_vblank_crtc *vblank; + struct intel_encoder *encoder; + + if (!crtc->active) + continue; + + vblank = drm_crtc_vblank_crtc(&crtc->base); + + if (vblank->enabled) + return false; + + for_each_encoder_on_crtc(display->drm, &crtc->base, encoder) + if (encoder->type != INTEL_OUTPUT_EDP || + !CAN_PSR(enc_to_intel_dp(encoder))) + return false; + } + + return true; +} + static void hsw_activate_psr1(struct intel_dp *intel_dp) { struct intel_display *display = to_intel_display(intel_dp); @@ -1010,7 +1086,18 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp) u32 val = EDP_PSR2_ENABLE; u32 psr_val = 0; - val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp)); + /* + * Wa_22019444797 + * TODO: Disable idle frames when vblank gets enabled while + * PSR2 is enabled + */ + if (DISPLAY_VER(dev_priv) != 20 || + !intel_dp->psr.is_dpkgc_configured || + intel_dp->psr.is_dc5_entry_possible) + val |= EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp)); + else + drm_dbg_kms(display->drm, + "Wa 22019444797 requirement met PSR2 deep sleep disabled\n"); if (DISPLAY_VER(display) < 14 && !IS_ALDERLAKE_P(dev_priv)) val |= EDP_SU_TRACK_ENABLE; @@ -1692,6 +1779,20 @@ void intel_psr_compute_config(struct intel_dp *intel_dp, crtc_state->has_sel_update = intel_sel_update_config_valid(intel_dp, crtc_state); } +void intel_psr_compute_config_late(struct intel_crtc_state *crtc_state) +{ + struct intel_display *display = to_intel_display(crtc_state); + + if (DISPLAY_VER(display) == 20) { + crtc_state->is_dpkgc_configured = + intel_psr_is_dpkgc_configured(display, crtc_state); + crtc_state->is_dc5_entry_possible = + intel_psr_is_dc5_entry_possible(display, crtc_state); + crtc_state->is_wa_delayed_vblank_limit = + intel_psr_wa_delayed_vblank(&crtc_state->hw.adjusted_mode); + } +} + void intel_psr_get_config(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config) { @@ -2774,6 +2875,22 @@ int intel_psr2_sel_fetch_update(struct intel_atomic_state *state, return 0; } +static void +wa_22019444797_fill_psr_params(const struct intel_crtc_state *crtc_state, + struct intel_psr *psr) +{ + struct intel_display *display = to_intel_display(crtc_state); + + if (DISPLAY_VER(display) == 20) { + psr->is_dpkgc_configured = + crtc_state->is_dpkgc_configured; + psr->is_dc5_entry_possible = + crtc_state->is_dc5_entry_possible; + psr->is_wa_delayed_vblank_limit = + crtc_state->is_wa_delayed_vblank_limit; + } +} + void intel_psr_pre_plane_update(struct intel_atomic_state *state, struct intel_crtc *crtc) { @@ -2796,6 +2913,8 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state, mutex_lock(&psr->lock); + wa_22019444797_fill_psr_params(new_crtc_state, psr); + /* * Reasons to disable: * - PSR disabled in new state @@ -2803,6 +2922,7 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state, * - Changing between PSR versions * - Region Early Transport changing * - Display WA #1136: skl, bxt + * - Display WA_22019444797 */ needs_to_disable |= intel_crtc_needs_modeset(new_crtc_state); needs_to_disable |= !new_crtc_state->has_psr; @@ -2812,6 +2932,8 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state, psr->su_region_et_enabled; needs_to_disable |= DISPLAY_VER(i915) < 11 && new_crtc_state->wm_level_disabled; + /* TODO: Disable PSR1 when vblank gets enabled while PSR1 is enabled */ + needs_to_disable |= wa_22019444797_psr1(new_crtc_state, psr); if (psr->enabled && needs_to_disable) intel_psr_disable_locked(intel_dp); @@ -2852,6 +2974,12 @@ void intel_psr_post_plane_update(struct intel_atomic_state *state, keep_disabled |= DISPLAY_VER(display) < 11 && crtc_state->wm_level_disabled; + /* + * Wa_22019444797 + * TODO: Disable PSR1 when vblank gets enabled while PSR1 is enabled + */ + keep_disabled |= wa_22019444797_psr1(crtc_state, psr); + if (!psr->enabled && !keep_disabled) intel_psr_enable_locked(intel_dp, crtc_state); else if (psr->enabled && !crtc_state->wm_level_disabled) diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h index 956be263c09e..0923a2f74901 100644 --- a/drivers/gpu/drm/i915/display/intel_psr.h +++ b/drivers/gpu/drm/i915/display/intel_psr.h @@ -47,6 +47,7 @@ void intel_psr_init(struct intel_dp *intel_dp); void intel_psr_compute_config(struct intel_dp *intel_dp, struct intel_crtc_state *crtc_state, struct drm_connector_state *conn_state); +void intel_psr_compute_config_late(struct intel_crtc_state *crtc_state); void intel_psr_get_config(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config); void intel_psr_irq_handler(struct intel_dp *intel_dp, u32 psr_iir);
To reach PC10 when PKG_C_LATENCY is configure we must do the following things 1) Enter PSR1 only when delayed_vblank < 6 lines and DC5 can be entered 2) Allow PSR2 deep sleep when DC5 can be entered 3) DC5 can be entered when all transocoder have either PSR1, PSR2 or eDP 1.5 PR ALPM enabled and VBI is disabled and flips and pushes are not happening. --v2 -Add debug prints --v3 -use crtc as variable name for intel_crtc [Jani] -use encoder as variable name for intel_encoder [Jani] -No changes in intel_dp in compute_config_late [Jani] --v4 -Remove "check" from naming [Jani] -Remove intel_encoder variable which is not necessary in compute_config_late WA: 22019444797 Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com> --- drivers/gpu/drm/i915/display/intel_ddi.c | 3 + .../drm/i915/display/intel_display_types.h | 6 + drivers/gpu/drm/i915/display/intel_psr.c | 130 +++++++++++++++++- drivers/gpu/drm/i915/display/intel_psr.h | 1 + 4 files changed, 139 insertions(+), 1 deletion(-)