[Intel-gfx] [PATCH v4] drm/i915/display: Support PSR entry VSC packet to be transmitted one frame earlier
Hogander, Jouni
jouni.hogander at intel.com
Mon Nov 6 12:45:51 UTC 2023
On Mon, 2023-11-06 at 13:42 +0200, Mika Kahola wrote:
> Display driver shall read DPCD 00071h[3:1] during configuration
> to get PSR setup time. This register provides the setup time
> requirement on the VSC SDP entry packet. If setup time cannot be
> met with the current timings
> (e.g., PSR setup time + other blanking requirements > blanking time),
> driver should enable sending VSC SDP one frame earlier before sending
> the capture frame.
>
> BSpec: 69895 (PSR Entry Setup Frames 17:16)
>
> v2: Write frames before su entry to correct register (Ville, Jouni)
> Move frames before su entry calculation to it's
> own function (Ville, Jouni)
> Rename PSR Entry Setup Frames register to indicate
> Lunarlake specificity (Jouni)
> v3: Modify setup entry frames calculation function to
> return the actual frames (Ville)
> Match comment with actual implementation (Jouni)
> v4: Drop "set" from function naming (Jouni, Ville)
> Use i915 instead of dev_priv (Jouni)
>
> Signed-off-by: Mika Kahola <mika.kahola at intel.com>
Reviewed-by: Jouni Högander <jouni.hogander at intel.com>
> ---
> .../drm/i915/display/intel_display_types.h | 1 +
> drivers/gpu/drm/i915/display/intel_psr.c | 82 +++++++++++++++--
> --
> drivers/gpu/drm/i915/display/intel_psr_regs.h | 2 +
> 3 files changed, 71 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 047fe3f8905a..92f06d67fd1e 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1708,6 +1708,7 @@ struct intel_psr {
> u32 dc3co_exitline;
> u32 dc3co_exit_delay;
> struct delayed_work dc3co_work;
> + u8 entry_setup_frames;
> };
>
> struct intel_dp {
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 920f77336163..fc242916349b 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -593,6 +593,9 @@ static void intel_psr_enable_sink(struct intel_dp
> *intel_dp)
> if (intel_dp->psr.req_psr2_sdp_prior_scanline)
> dpcd_val |= DP_PSR_SU_REGION_SCANLINE_CAPTURE;
>
> + if (intel_dp->psr.entry_setup_frames > 0)
> + dpcd_val |= DP_PSR_FRAME_CAPTURE;
> +
> drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, dpcd_val);
>
> drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> @@ -691,6 +694,9 @@ static void hsw_activate_psr1(struct intel_dp
> *intel_dp)
> if (DISPLAY_VER(dev_priv) >= 8)
> val |= EDP_PSR_CRC_ENABLE;
>
> + if (DISPLAY_VER(dev_priv) >= 20)
> + val |= LNL_EDP_PSR_ENTRY_SETUP_FRAMES(intel_dp-
> >psr.entry_setup_frames);
> +
> intel_de_rmw(dev_priv, psr_ctl_reg(dev_priv, cpu_transcoder),
> ~EDP_PSR_RESTORE_PSR_ACTIVE_CTX_MASK, val);
> }
> @@ -728,11 +734,27 @@ static int psr2_block_count(struct intel_dp
> *intel_dp)
> return psr2_block_count_lines(intel_dp) / 4;
> }
>
> +static u8 frames_before_su_entry(struct intel_dp *intel_dp)
> +{
> + u8 frames_before_su_entry;
> +
> + frames_before_su_entry = max_t(u8,
> + intel_dp-
> >psr.sink_sync_latency + 1,
> + 2);
> +
> + /* Entry setup frames must be at least 1 less than frames
> before SU entry */
> + if (intel_dp->psr.entry_setup_frames >=
> frames_before_su_entry)
> + frames_before_su_entry = intel_dp-
> >psr.entry_setup_frames + 1;
> +
> + return frames_before_su_entry;
> +}
> +
> static void hsw_activate_psr2(struct intel_dp *intel_dp)
> {
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> enum transcoder cpu_transcoder = intel_dp->psr.transcoder;
> u32 val = EDP_PSR2_ENABLE;
> + u32 psr_val = 0;
>
> val |=
> EDP_PSR2_IDLE_FRAMES(psr_compute_idle_frames(intel_dp));
>
> @@ -742,7 +764,8 @@ static void hsw_activate_psr2(struct intel_dp
> *intel_dp)
> if (DISPLAY_VER(dev_priv) >= 10 && DISPLAY_VER(dev_priv) <=
> 12)
> val |= EDP_Y_COORDINATE_ENABLE;
>
> - val |= EDP_PSR2_FRAME_BEFORE_SU(max_t(u8, intel_dp-
> >psr.sink_sync_latency + 1, 2));
> + val |=
> EDP_PSR2_FRAME_BEFORE_SU(frames_before_su_entry(intel_dp));
> +
> val |= intel_psr2_get_tp_time(intel_dp);
>
> if (DISPLAY_VER(dev_priv) >= 12) {
> @@ -786,6 +809,9 @@ static void hsw_activate_psr2(struct intel_dp
> *intel_dp)
> if (intel_dp->psr.req_psr2_sdp_prior_scanline)
> val |= EDP_PSR2_SU_SDP_SCANLINE;
>
> + if (DISPLAY_VER(dev_priv) >= 20)
> + psr_val |= LNL_EDP_PSR_ENTRY_SETUP_FRAMES(intel_dp-
> >psr.entry_setup_frames);
> +
> if (intel_dp->psr.psr2_sel_fetch_enabled) {
> u32 tmp;
>
> @@ -799,7 +825,7 @@ static void hsw_activate_psr2(struct intel_dp
> *intel_dp)
> * PSR2 HW is incorrectly using EDP_PSR_TP1_TP3_SEL and BSpec
> is
> * recommending keep this bit unset while PSR2 is enabled.
> */
> - intel_de_write(dev_priv, psr_ctl_reg(dev_priv,
> cpu_transcoder), 0);
> + intel_de_write(dev_priv, psr_ctl_reg(dev_priv,
> cpu_transcoder), psr_val);
>
> intel_de_write(dev_priv, EDP_PSR2_CTL(cpu_transcoder), val);
> }
> @@ -1067,6 +1093,40 @@ static bool _compute_psr2_wake_times(struct
> intel_dp *intel_dp,
> return true;
> }
>
> +static u8 intel_psr_entry_setup_frames(struct intel_dp *intel_dp,
> + const struct
> drm_display_mode *adjusted_mode)
> +{
> + struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> + int psr_setup_time = drm_dp_psr_setup_time(intel_dp-
> >psr_dpcd);
> + u8 entry_setup_frames = 0;
> +
> + if (psr_setup_time < 0) {
> + drm_dbg_kms(&i915->drm,
> + "PSR condition failed: Invalid PSR setup
> time (0x%02x)\n",
> + intel_dp->psr_dpcd[1]);
> + return -ETIME;
> + }
> +
> +
> + if (intel_usecs_to_scanlines(adjusted_mode, psr_setup_time) >
> + adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vdisplay
> - 1) {
> + if (DISPLAY_VER(i915) >= 20) {
> + /* setup entry frames can be up to 3 frames
> */
> + entry_setup_frames = 1;
> + drm_dbg_kms(&i915->drm,
> + "PSR setup entry frames %d\n",
> + entry_setup_frames);
> + } else {
> + drm_dbg_kms(&i915->drm,
> + "PSR condition failed: PSR setup
> time (%d us) too long\n",
> + psr_setup_time);
> + return -ETIME;
> + }
> + }
> +
> + return entry_setup_frames;
> +}
> +
> static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> struct intel_crtc_state
> *crtc_state)
> {
> @@ -1214,7 +1274,7 @@ void intel_psr_compute_config(struct intel_dp
> *intel_dp,
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> const struct drm_display_mode *adjusted_mode =
> &crtc_state->hw.adjusted_mode;
> - int psr_setup_time;
> + u8 entry_setup_frames;
>
> /*
> * Current PSR panels don't work reliably with VRR enabled
> @@ -1243,19 +1303,13 @@ void intel_psr_compute_config(struct intel_dp
> *intel_dp,
> return;
> }
>
> - psr_setup_time = drm_dp_psr_setup_time(intel_dp->psr_dpcd);
> - if (psr_setup_time < 0) {
> - drm_dbg_kms(&dev_priv->drm,
> - "PSR condition failed: Invalid PSR setup
> time (0x%02x)\n",
> - intel_dp->psr_dpcd[1]);
> - return;
> - }
> + entry_setup_frames = intel_psr_entry_setup_frames(intel_dp,
> adjusted_mode);
>
> - if (intel_usecs_to_scanlines(adjusted_mode, psr_setup_time) >
> - adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vdisplay
> - 1) {
> + if (entry_setup_frames >= 0) {
> + intel_dp->psr.entry_setup_frames =
> entry_setup_frames;
> + } else {
> drm_dbg_kms(&dev_priv->drm,
> - "PSR condition failed: PSR setup time (%d
> us) too long\n",
> - psr_setup_time);
> + "PSR condition failed: PSR setup timing
> not met\n");
> return;
> }
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr_regs.h
> b/drivers/gpu/drm/i915/display/intel_psr_regs.h
> index d39951383c92..efe4306b37e0 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr_regs.h
> +++ b/drivers/gpu/drm/i915/display/intel_psr_regs.h
> @@ -35,6 +35,8 @@
> #define
> EDP_PSR_MIN_LINK_ENTRY_TIME_0_LINES REG_FIELD_PREP(EDP_PSR_MIN_LINK_
> ENTRY_TIME_MASK, 3)
> #define EDP_PSR_MAX_SLEEP_TIME_MASK REG_GENMASK(24, 20)
> #define
> EDP_PSR_MAX_SLEEP_TIME(x) REG_FIELD_PREP(EDP_PSR_MAX_SLEEP
> _TIME_MASK, (x))
> +#define LNL_EDP_PSR_ENTRY_SETUP_FRAMES_MASK REG_GENMASK(17, 16)
> +#define
> LNL_EDP_PSR_ENTRY_SETUP_FRAMES(x) REG_FIELD_PREP(LNL_EDP_PSR_ENTRY
> _SETUP_FRAMES_MASK, (x))
> #define EDP_PSR_SKIP_AUX_EXIT REG_BIT(12)
> #define EDP_PSR_TP_MASK REG_BIT(11)
> #define
> EDP_PSR_TP_TP1_TP2 REG_FIELD_PREP(EDP_PSR_TP_MASK,
> 0)
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