On Mon, 27 Sep 2021, Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@xxxxxxxxx> wrote:
> Display underrun in HDR mode when cursor is enabled.
> RTL fix will be implemented CLKGATE_DIS_PSL_A bit 28-46520h.
> As per W/A 1604331009, Disable cursor clock gating in HDR mode.
>
> Bspec : 33451
>
> Changes since V4:
> - Added WA needed check - Ville
> - Replace BIT with REG_BIT - Ville
> - Add WA enable/disable support back which was added in V1 - Ville
> Changes since V3:
> - Disable WA when not in HDR mode or cursor plane not active - Ville
> - Extract required args from crtc_state - Ville
> - Create HDR mode API using bdw_set_pipemisc ref - Ville
> - Tested with HDR video as well full setmode, WA applies and disables
> Changes since V2:
> - Made it general gen11 WA
> - Removed WA needed check
> - Added cursor plane active check
> - Once WA enable, software will not disable
> Changes since V1:
> - Modified way CLKGATE_DIS_PSL bit 28 was modified
>
> Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 36 ++++++++++++++++++++
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> 2 files changed, 37 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index f27c294beb92..fef3e182c5e7 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -214,6 +214,19 @@ icl_wa_scalerclkgating(struct drm_i915_private *dev_priv, enum pipe pipe,
> intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) & ~DPFR_GATING_DIS);
> }
>
> +/* Wa_1604331009:icl,jsl,ehl */
> +static void
> +icl_wa_cursorclkgating(struct drm_i915_private *dev_priv, enum pipe pipe,
> + bool enable)
> +{
> + if (enable)
> + intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
> + intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) | CURSOR_GATING_DIS);
> + else
> + intel_de_write(dev_priv, CLKGATE_DIS_PSL(pipe),
> + intel_de_read(dev_priv, CLKGATE_DIS_PSL(pipe)) & ~CURSOR_GATING_DIS);
intel_de_rmw(i915, CLKGATE_DIS_PSL(pipe), CURSOR_GATING_DIS, enable ? CURSOR_GATING_DIS : 0);
> +}
> +
> static bool
> is_trans_port_sync_slave(const struct intel_crtc_state *crtc_state)
> {
> @@ -2356,6 +2369,19 @@ static bool needs_scalerclk_wa(const struct intel_crtc_state *crtc_state)
> return false;
> }
>
> +static bool needs_cursorclk_wa(const struct intel_crtc_state *crtc_state)
> +{
> + struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
> +
> + /* Wa_1604331009:icl,jsl,ehl */
> + if (is_hdr_mode(crtc_state) &&
> + crtc_state->active_planes & BIT(PLANE_CURSOR) &&
> + DISPLAY_VER(dev_priv) == 11)
> + return true;
> +
> + return false;
> +}
> +
> static bool planes_enabling(const struct intel_crtc_state *old_crtc_state,
> const struct intel_crtc_state *new_crtc_state)
> {
> @@ -2398,6 +2424,11 @@ static void intel_post_plane_update(struct intel_atomic_state *state,
> if (needs_scalerclk_wa(old_crtc_state) &&
> !needs_scalerclk_wa(new_crtc_state))
> icl_wa_scalerclkgating(dev_priv, pipe, false);
> +
> + if (needs_cursorclk_wa(old_crtc_state) &&
> + !needs_cursorclk_wa(new_crtc_state))
> + icl_wa_cursorclkgating(dev_priv, pipe, false);
> +
> }
>
> static void intel_crtc_enable_flip_done(struct intel_atomic_state *state,
> @@ -2494,6 +2525,11 @@ static void intel_pre_plane_update(struct intel_atomic_state *state,
> needs_scalerclk_wa(new_crtc_state))
> icl_wa_scalerclkgating(dev_priv, pipe, true);
>
> + /* Wa_1604331009:icl,jsl,ehl */
> + if (!needs_cursorclk_wa(old_crtc_state) &&
> + needs_cursorclk_wa(new_crtc_state))
> + icl_wa_cursorclkgating(dev_priv, pipe, true);
> +
> /*
> * Vblank time updates from the shadow to live plane control register
> * are blocked if the memory self-refresh mode is active at that
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index ef594df039db..7b3eed5b4e42 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4272,6 +4272,7 @@ enum {
> #define DPF_GATING_DIS (1 << 10)
> #define DPF_RAM_GATING_DIS (1 << 9)
> #define DPFR_GATING_DIS (1 << 8)
> +#define CURSOR_GATING_DIS REG_BIT(28)
>
> #define CLKGATE_DIS_PSL(pipe) \
> _MMIO_PIPE(pipe, _CLKGATE_DIS_PSL_A, _CLKGATE_DIS_PSL_B)
--
Jani Nikula, Intel Open Source Graphics Center
