[PATCH v2] drm/omapdrm: dispc: Refuse x-decimation above 4 for all but 8-bit formats

[Tomi Valkeinen]

On 08/02/17 16:08, Jyri Sarha wrote:
> Let's disable all scaling that requires horizontal decimation with
> higher factor than 4, until we have better estimates of what we can
> and can not do. However, NV12 color format appears to work Ok with
> all decimation factors.
> 
> When decimating horizontally by more that 4 the dss is not able to
> fetch the data in burst mode. When this happens it is hard to tell if
> there enough bandwidth. Despite what theory says this appears to be
> true also for 16-bit color formats.
> 
> Signed-off-by: Jyri Sarha <jsarha at ti.com>
> ---
> Chnages since first version:
> - "color_mode_to_bpp(color_mode) > 8" -> "color_mode != OMAP_DSS_COLOR_NV12"
>   - commit message and comment updated too
> - improve error print
> 
>  drivers/gpu/drm/omapdrm/dss/dispc.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

Thanks, I've picked this up.

 Tomi

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