Thanks for clarifications.. This is now
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@xxxxxxxxx>
On Mon, 2023-10-02 at 10:02 +0300, Ville Syrjälä wrote:
> On Sun, Oct 01, 2023 at 10:53:37AM +0000, Govindapillai, Vinod wrote:
> > Hi Ville,
> >
> >
> > On Thu, 2023-09-14 at 14:38 +0300, Ville Syrjala wrote:
> > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > >
> > > Carve up stride_is_valid() into per-platform variants to
> > > make it easier to see what limits are actually being imposed.
> > >
> > > TODO: maybe go for vfuncs later
> > >
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_fbc.c | 68 ++++++++++++++++++------
> > > 1 file changed, 51 insertions(+), 17 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c
> > > b/drivers/gpu/drm/i915/display/intel_fbc.c
> > > index 1b3358a0fbfb..4c4626c84666 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> > > @@ -848,6 +848,47 @@ void intel_fbc_cleanup(struct drm_i915_private *i915)
> > > }
> > > }
> > >
> > > +static bool i8xx_fbc_stride_is_valid(const struct intel_plane_state *plane_state)
> > > +{
> > > + const struct drm_framebuffer *fb = plane_state->hw.fb;
> > > + unsigned int stride = intel_fbc_plane_stride(plane_state) *
> > > + fb->format->cpp[0];
> > > +
> > > + return stride == 4096 || stride == 8192;
> > > +}
> > > +
> > > +static bool i965_fbc_stride_is_valid(const struct intel_plane_state *plane_state)
> > > +{
> > > + const struct drm_framebuffer *fb = plane_state->hw.fb;
> > > + unsigned int stride = intel_fbc_plane_stride(plane_state) *
> > > + fb->format->cpp[0];
> > > +
> > > + return stride >= 2048 && stride <= 16384;
> > > +}
> > > +
> > > +static bool g4x_fbc_stride_is_valid(const struct intel_plane_state *plane_state)
> > > +{
> > > + return true;
> > > +}
> > > +
> > > +static bool skl_fbc_stride_is_valid(const struct intel_plane_state *plane_state)
> > > +{
> > > + const struct drm_framebuffer *fb = plane_state->hw.fb;
> > > + unsigned int stride = intel_fbc_plane_stride(plane_state) *
> > > + fb->format->cpp[0];
> > > +
> > > + /* Display WA #1105: skl,bxt,kbl,cfl,glk */
> > > + if (fb->modifier == DRM_FORMAT_MOD_LINEAR && stride & 511)
> > > + return false;
> > > +
> > > + return true;
> > > +}
> > > +
> > > +static bool icl_fbc_stride_is_valid(const struct intel_plane_state *plane_state)
> > > +{
> > > + return true;
> > > +}
> > > +
> > > static bool stride_is_valid(const struct intel_plane_state *plane_state)
> > > {
> > > struct drm_i915_private *i915 = to_i915(plane_state->uapi.plane->dev);
> > > @@ -859,23 +900,16 @@ static bool stride_is_valid(const struct intel_plane_state *plane_state)
> > > if (drm_WARN_ON_ONCE(&i915->drm, (stride & (64 - 1)) != 0))
> > > return false;
> > >
> > > - /* Below are the additional FBC restrictions. */
> > > - if (stride < 512)
> > > - return false;
> > Is this check not required anymore for ICL+ and G4x?
>
> Pre-skl FBC only supports X-tile which is a multiple of 512 bytes
> anyway, so the check is redundant there.
>
> And skl+ can support smaller strides with modifiers that have
> smaller tile width (minus the linear stride w/a on skl/bxt/glk).
>
> Perhaps removing this check should be a separate patch...
> and we could remove the "multiple of 64 bytes" check too
> since that is always true on any platform/modifier.
>
> >
> > > -
> > > - if (DISPLAY_VER(i915) == 2 || DISPLAY_VER(i915) == 3)
> > > - return stride == 4096 || stride == 8192;
> > > -
> > > - if (DISPLAY_VER(i915) == 4 && !IS_G4X(i915) &&
> > > - (stride < 2048 || stride > 16384))
> > > - return false;
> > > -
> > > - /* Display WA #1105: skl,bxt,kbl,cfl,glk */
> > > - if ((DISPLAY_VER(i915) == 9 || IS_GEMINILAKE(i915)) &&
> > > - fb->modifier == DRM_FORMAT_MOD_LINEAR && stride & 511)
> > > - return false;
> > > -
> > > - return true;
> > > + if (DISPLAY_VER(i915) >= 11)
> > > + return icl_fbc_stride_is_valid(plane_state);
> > > + else if (DISPLAY_VER(i915) >= 9)
> > > + return skl_fbc_stride_is_valid(plane_state);
> > > + else if (DISPLAY_VER(i915) >= 5 || IS_G4X(i915))
> > > + return g4x_fbc_stride_is_valid(plane_state);
> > > + else if (DISPLAY_VER(i915) == 4)
> > > + return i965_fbc_stride_is_valid(plane_state);
> > > + else
> > > + return i8xx_fbc_stride_is_valid(plane_state);
> > Also I guess we could pass "stride" as parameter to these functions for clarity and simplify.
>
> We need more than the stride there.
>
> >
> > There as some IGT CI failures related to bad_stride tests.
>
> Yeah, I need to nuke that subtest.
>
> >
> > BR
> > Vinod
> > > }
> > >
> > > static bool pixel_format_is_valid(const struct intel_plane_state *plane_state)
> >
>
