[PATCH v4 4/4] drm/msm/mdss: Handle the reg bus ICC path

[Abhinav Kumar]

On 12/2/2023 2:42 PM, Dmitry Baryshkov wrote:
> Apart from the already handled data bus (MAS_MDP_Pn<->DDR), there's
> another path that needs to be handled to ensure MDSS functions properly,
> namely the "reg bus", a.k.a the CPU-MDSS interconnect.
> 
> Gating that path may have a variety of effects, from none to otherwise
> inexplicable DSI timeouts.
> 
> Provide a way for MDSS driver to vote on this bus.
> 
> A note regarding vote values. Newer platforms have corresponding
> bandwidth values in the vendor DT files. For the older platforms there
> was a static vote in the mdss_mdp and rotator drivers. I choose to be
> conservative here and choose this value as a default.
> 
> Co-developed-by: Konrad Dybcio <konrad.dybcio at linaro.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio at linaro.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
>   drivers/gpu/drm/msm/msm_mdss.c | 49 +++++++++++++++++++++++++++++++---
>   drivers/gpu/drm/msm/msm_mdss.h |  1 +
>   2 files changed, 46 insertions(+), 4 deletions(-)
> 

I checked the values with corresponding DT files and they match,

Reviewed-by: Abhinav Kumar <quic_abhinavk at quicinc.com>