On Fri, Oct 04, 2024 at 04:22:42PM +0300, Juha-Pekka Heikkila wrote:
> On 18.9.2024 17.44, Ville Syrjala wrote:
> > From: Ville Syrjälä <[email protected]>
> >
> > Bspec asks us to disable some compression trick on JSL. While the
> > bspec description is pretty vague it looks like this is some extra
> > trick for 10bpc+ CCS which presumably the ICL derived display engine
> > doesn't support.
> >
> > Note that we aren't currently exposing 10bpc CCS scanout support,
> > but once that gets added this presumably becomes an issue.
> >
> > Signed-off-by: Ville Syrjälä <[email protected]>
> > ---
> > drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 +
> > drivers/gpu/drm/i915/gt/intel_workarounds.c | 9 +++++++++
> > 2 files changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > index 57a3c83d3655..67c47c8b75fb 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> > @@ -432,6 +432,7 @@
> > #define XEHPG_INSTDONE_GEOM_SVG MCR_REG(0x666c)
> >
> > #define CACHE_MODE_0_GEN7 _MMIO(0x7000) /* IVB+ */
> > +#define DISABLE_REPACKING_FOR_COMPRESSION REG_BIT(15) /* jsl+ */
> > #define RC_OP_FLUSH_ENABLE (1 << 0)
> > #define HIZ_RAW_STALL_OPT_DISABLE (1 << 2)
> > #define CACHE_MODE_1 _MMIO(0x7004) /* IVB+ */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > index e539a656cfc3..6972525fe6be 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> > @@ -2299,6 +2299,15 @@ rcs_engine_wa_init(struct intel_engine_cs *engine,
> > struct i915_wa_list *wal)
> > GEN8_RC_SEMA_IDLE_MSG_DISABLE);
> > }
> >
> > + if (IS_JASPERLAKE(i915) || IS_ELKHARTLAKE(i915)) {
> > + /*
> > + * "Disable Repacking for Compression (masked R/W access)
> > + * before rendering compressed surfaces for display."
> > + */
>
> I think here would be needed the wa number mentioned since it's on all
> the other cases.
There isn't one.
>
> > + wa_masked_en(wal, CACHE_MODE_0_GEN7,
> > + DISABLE_REPACKING_FOR_COMPRESSION);
> > + }
> > +
> > if (GRAPHICS_VER(i915) == 11) {
> > /* This is not an Wa. Enable for better image quality */
> > wa_masked_en(wal,
--
Ville Syrjälä
Intel
