On Wed, Feb 25, 2015 at 10:36:38AM +0000, Tvrtko Ursulin wrote:
>
> On 02/24/2015 05:36 PM, Ville Syrjälä wrote:
> > On Mon, Feb 23, 2015 at 03:55:56PM +0000, Tvrtko Ursulin wrote:
> >> From: Damien Lespiau <damien.lespiau@xxxxxxxxx>
> >>
> >> Skylake is able to scannout those tiling formats. We need to allow them
> >> in the ADDFB ioctl and tell the harware about it.
> >>
> >> v2: Rebased for addfb2 interface. (Tvrtko Ursulin)
> >> v3: Rebased for fb modifier changes. (Tvrtko Ursulin)
> >> v4: Don't allow Y tiled fbs just yet. (Tvrtko Ursulin)
> >> v5: Check for stride alignment and max pitch. (Tvrtko Ursulin)
> >> v6: Simplify maximum pitch check. (Ville Syrjälä)
> >> v7: Drop the gen9 check since requirements are no different. (Ville Syrjälä)
> >>
> >> Signed-off-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
> >> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> >> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >> ---
> >> drivers/gpu/drm/i915/intel_display.c | 115 ++++++++++++++++++++++++-----------
> >> drivers/gpu/drm/i915/intel_drv.h | 2 +
> >> drivers/gpu/drm/i915/intel_sprite.c | 18 ++++--
> >> 3 files changed, 95 insertions(+), 40 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> >> index 6e70748..a523d84 100644
> >> --- a/drivers/gpu/drm/i915/intel_display.c
> >> +++ b/drivers/gpu/drm/i915/intel_display.c
> >> @@ -2728,6 +2728,34 @@ static void ironlake_update_primary_plane(struct drm_crtc *crtc,
> >> POSTING_READ(reg);
> >> }
> >>
> >> +u32 intel_fb_stride_alignment(struct drm_device *dev, uint64_t fb_modifier,
> >> + uint32_t pixel_format)
> >> +{
> >> + u32 bits_per_pixel = drm_format_plane_cpp(pixel_format, 0) * 8;
> >> +
> >> + /*
> >> + * The stride is either expressed as a multiple of 64 bytes
> >> + * chunks for linear buffers or in number of tiles for tiled
> >> + * buffers.
> >> + */
> >> + switch (fb_modifier) {
> >> + case DRM_FORMAT_MOD_NONE:
> >> + return 64;
> >> + case I915_FORMAT_MOD_X_TILED:
> >
> > if (gen2)
> > return 128;
>
> Okay I'll add it blindly, but again, I failed to find this in existing code.
i915_tiling_ok()
>
> >> + return 512;
> >> + case I915_FORMAT_MOD_Y_TILED:
> >> + return 128;
> >
> > In theory we could check gen2 and HAS_128_BYTE_Y_TILING() here, but
> > since old platforms didn't do Y tiled scanout anyway that's not really
> > needed. But maybe toss in a comment about that so that people don't
> > start wondering why this doesn't care about that stuff?
>
> Will do.
>
> Regards,
>
> Tvrtko
--
Ville Syrjälä
Intel OTC
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