[PATCH 3/5 v2] drm/exynos: allow mulitple layer updates per vsync for mixer

[Rahul Sharma]

Thanks Inki,

One more thing. mixer_layer_update is only called on for mixer version;
MXR_VER_16_0_33_0, MXR_VER_128_0_0_184. This condition
should have taken care of Exynos4 scenarios. What you say?

Regards,
Rahul Sharma.

On 24 June 2014 20:20, Inki Dae <inki.dae at samsung.com> wrote:
> 2014-06-24 20:38 GMT+09:00 Andreas Färber <afaerber at suse.de>:
>> Am 24.06.2014 07:21, schrieb Inki Dae:
>>> On 2014년 06월 23일 14:32, Rahul Sharma wrote:
>>>> Allowing only one layer update per vsync can cause issues
>>>> while there are update available for both layers. There is
>>>> a good amount of possibility to loose updates if we allow
>>>> single update per vsync.
>>>>
>>>> Signed-off-by: Rahul Sharma <rahul.sharma at samsung.com>
>>>> ---
>>>>  drivers/gpu/drm/exynos/exynos_mixer.c |    7 +------
>>>>  1 file changed, 1 insertion(+), 6 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
>>>> index d359501..6773b03 100644
>>>> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
>>>> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
>>>> @@ -511,13 +511,8 @@ static void vp_video_buffer(struct mixer_context *ctx, int win)
>>>>  static void mixer_layer_update(struct mixer_context *ctx)
>>>>  {
>>>>      struct mixer_resources *res = &ctx->mixer_res;
>>>> -    u32 val;
>>>> -
>>>> -    val = mixer_reg_read(res, MXR_CFG);
>>>>
>>>> -    /* allow one update per vsync only */
>>>> -    if (!(val & MXR_CFG_LAYER_UPDATE_COUNT_MASK))
>>>> -            mixer_reg_writemask(res, MXR_CFG, ~0, MXR_CFG_LAYER_UPDATE);
>>>> +    mixer_reg_writemask(res, MXR_CFG, ~0, MXR_CFG_LAYER_UPDATE);
>>>
>>> Rahul, it looks good to me and ok as is. But above codes don't consider
>>> Exynos4 series. In case of Exynos4xxx SoC,
>>> MXR_CFG_LAYER_UPDATE_COUNT_MASK and MXR_CFG_LAYER_UPDATE of MIXER_CFG
>>> register are reserved fields. So can you work that patch to be
>>> considered for Exynos4xxx SoC? That patch would be additional one.
>>>
>>> Anyway, will apply it as is, and I will wait for the additional patch.
>>
>> If it's not too late, could you fix up "multiple" in the subject? :)
>
> Corrected. :)
>
> Thanks,
> Inki Dae
>
>>
>> Cheers,
>> Andreas
>>
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