Hi Kuogee,
On 2023-05-03 13:10:34, Kuogee Hsieh wrote:
> Legacy DPU (DPU < 7.0.0) requires PP block to be involved during
Nit: I wouldn't call it "legacy" (that's not really relevant here), just
DPU < 7.0.0 requires the PINGPONG block ...
> DSC setting up. Since then, enable and start the DSC encoder engine
then -> since DPU 7.0.0
enabling* and starting* the DSC encoder engine
> had moved to INTF with helps of flush mechanism. This patch adds
s/had/has, or remove had altogether
"with the help of a/the"
This patch adds a (new)*, but you shouldn't write "this patch" at all:
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
> DPU_PINGPONG_DSC feature bit to indicate that both
> dpu_hw_pp_setup_dsc() and dpu_hw_pp_dsc_enable() pingpong ops
> functions are required to complete DSC datapath setup and start
> DSC engine.
... which should only be set on DPU < 7.0.0, but it doesn't seem like
"complete DSC datapath" really explains the goal of this patch (namely
disabling it on DPU >= 7.0.0, by only making it available on DPU <
7.0.0).
How about replacing this whole sentence, starting at "This patch", with:
Add a DPU_PINGPONG_DSC feature bit to restrict the availability of
dpu_hw_pp_setup_dsc() and dpu_hw_pp_dsc_{enable,disable}() on the
PINGPONG block to DPU < 7.0.0 hardware, as the registers are not
available [in the PINGPONG block] on DPU 7.0.0 and higher anymore.
Existing call-sites to these callbacks already skip calling into
them if the function pointer is NULL.
How does that sound to you?
> Changes in v4:
> -- add more details commit text
>
> Reported-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 2 ++
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c | 9 ++++++---
> 2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> index 71584cd..5d210f3 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -144,6 +144,7 @@ enum {
> * @DPU_PINGPONG_SPLIT PP block supports split fifo
> * @DPU_PINGPONG_SLAVE PP block is a suitable slave for split fifo
> * @DPU_PINGPONG_DITHER, Dither blocks
> + * @DPU_PINGPONG_DSC, PP ops functions required for DSC
As said in v3, drop the comma.
> * @DPU_PINGPONG_MAX
> */
> enum {
> @@ -152,6 +153,7 @@ enum {
> DPU_PINGPONG_SPLIT,
> DPU_PINGPONG_SLAVE,
> DPU_PINGPONG_DITHER,
> + DPU_PINGPONG_DSC,
> DPU_PINGPONG_MAX
> };
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> index 3822e06..f255a04 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> @@ -264,9 +264,12 @@ static void _setup_pingpong_ops(struct dpu_hw_pingpong *c,
> c->ops.get_autorefresh = dpu_hw_pp_get_autorefresh_config;
> c->ops.poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
> c->ops.get_line_count = dpu_hw_pp_get_line_count;
> - c->ops.setup_dsc = dpu_hw_pp_setup_dsc;
> - c->ops.enable_dsc = dpu_hw_pp_dsc_enable;
> - c->ops.disable_dsc = dpu_hw_pp_dsc_disable;
> +
> + if (features & BIT(DPU_PINGPONG_DSC)) {
To stick with the style of this function, this should use test_bit()
like below for DPU_PINGPONG_DITHER.
Unless maintainers agree that we should replace all current uses in DPU
with `x & BIT(..)`.
- Marijn
> + c->ops.setup_dsc = dpu_hw_pp_setup_dsc;
> + c->ops.enable_dsc = dpu_hw_pp_dsc_enable;
> + c->ops.disable_dsc = dpu_hw_pp_dsc_disable;
> + }
>
> if (test_bit(DPU_PINGPONG_DITHER, &features))
> c->ops.setup_dither = dpu_hw_pp_setup_dither;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
