On Fri, Jun 18, 2021 at 05:16:06PM +0530, Tejas Upadhyay 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 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
>
> Cc: Souza Jose <[email protected]>
> Signed-off-by: Tejas Upadhyay <[email protected]>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 15 +++++++++++++++
> drivers/gpu/drm/i915/i915_reg.h | 5 +++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 6be1b31af07b..99b33455b945 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -383,6 +383,18 @@ 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,
Pointless function arguments since they can be derived from the
crtc state.
> + const struct intel_crtc_state *crtc_state)
> +{
> + if (crtc_state->active_planes & icl_hdr_plane_mask() &&
That doesn't mean HDR mode will be enabled. I would suggest extracting
the HDR mode stuff from bdw_set_pipemisc() into a small helper. Or
alternatively we could stick that into the crtc state even.
> + crtc_state->active_planes & BIT(PLANE_CURSOR) &&
> + IS_GEN(dev_priv, 11))
> + intel_de_rmw(dev_priv, CLKGATE_DIS_PSL(pipe),
> + CURSOR_GATING_DIS, CURSOR_GATING_DIS);
> +}
Where does it get turned back on?
> +
> static bool
> is_trans_port_sync_slave(const struct intel_crtc_state *crtc_state)
> {
> @@ -2939,6 +2951,9 @@ 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 */
> + icl_wa_cursorclkgating(dev_priv, pipe, new_crtc_state);
> +
> /*
> * 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 955027799d1d..bbdd8429297d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4235,6 +4235,11 @@ enum {
> #define INF_UNIT_LEVEL_CLKGATE _MMIO(0x9560)
> #define CGPSF_CLKGATE_DIS (1 << 3)
>
> +/*
> + * GEN11 clock gating regs
> + */
> +#define CURSOR_GATING_DIS BIT(28)
> +
> /*
> * Display engine regs
> */
> --
> 2.31.1
>
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--
Ville Syrjälä
Intel
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