Re: [PATCH 1/3] drm/msm/disp/dpu1: allow reservation even if dspps are not available.

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

On 17/01/2023 18:21, Kalyan Thota wrote:
> if any topology requests for dspps and catalogue doesn't have the
> allocation, avoid failing the reservation.
> 
> This can pave way to build logic allowing composer fallbacks
> for all the color features that are handled in dspp.
> 
> Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> index 73b3442..c8899ae 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> @@ -343,7 +343,13 @@ static bool _dpu_rm_check_lm_and_get_connected_blks(struct dpu_rm *rm,
>   		return true;
>   
>   	idx = lm_cfg->dspp - DSPP_0;
> -	if (idx < 0 || idx >= ARRAY_SIZE(rm->dspp_blks)) {
> +
> +	if (idx < 0) {

The change doesn't correspond to commit message.

> +		DPU_DEBUG("lm doesn't have dspp, ignoring the request %d\n", lm_cfg->dspp);
> +		return true;
> +	}
> +
> +	if (idx >= ARRAY_SIZE(rm->dspp_blks)) {
>   		DPU_ERROR("failed to get dspp on lm %d\n", lm_cfg->dspp);
>   		return false;
>   	}

If you'd like to remove duplicate for the (idx >= ARRAY_SIZE) check, I'd 
suggest dropping the second one


-- 
With best wishes
Dmitry