On 2023-04-14 09:46:17, Kuogee Hsieh wrote:
> In current code, the dsc active bits are set only if the cfg->dsc is set.
This is the old sentence from v1 again, did you accidentally send the
wrong patch as the improvements from v2 are missing?
> However, for displays which are hot-pluggable, there can be a use-case
> of disconnecting a DSC supported sink and connecting a non-DSC sink.
>
> For those cases we need to clear DSC active bits during teardown.
At least teardown is one word again, v2 had "tear down" which is wrong.
> As discuss at [1], clear DSC active bit will handled at reset_intf_cfg()
discussed* as pointed out by Dmitry, and make it clear that this is
about clearing CTL_DSC_ACTIVE (and CTL_DSC_FLUSH?) specifically. Once
that is moved to reset_intf_cfg(), this patch should be reverted as
there is no need to write the registers once again when cfg->dsc equals
0.
- Marijn
> Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
> Fixes: 77f6da90487c ("drm/msm/disp/dpu1: Add DSC support in hw_ctl")
> Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> Reviewed-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
>
> [1] https://lore.kernel.org/linux-arm-msm/ec045d6b-4ffd-0f8c-4011-8db45edc6978@xxxxxxxxxxx/
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> index bbdc95c..88e4efe 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -541,10 +541,9 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
> if (cfg->merge_3d)
> DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE,
> BIT(cfg->merge_3d - MERGE_3D_0));
> - if (cfg->dsc) {
> - DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, DSC_IDX);
> - DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
> - }
> +
> + DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, DSC_IDX);
> + DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
> }
>
> static void dpu_hw_ctl_intf_cfg(struct dpu_hw_ctl *ctx,
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
