linux-kernel - Re: [RFC PATCH 01/13] drm/dsc: Add dsc pps header init function

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Date:   Fri, 21 May 2021 17:29:24 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [RFC PATCH 01/13] drm/dsc: Add dsc pps header init function

On Fri, May 21, 2021 at 06:19:30PM +0530, Vinod Koul wrote:
> We required a helper to create and set the dsc_dce_header, so add the
> dsc_dce_header and API drm_dsc_dsi_pps_header_init
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/gpu/drm/drm_dsc.c | 11 +++++++++++
>  include/drm/drm_dsc.h     | 16 ++++++++++++++++
>  2 files changed, 27 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c
> index ff602f7ec65b..0c1b745090e2 100644
> --- a/drivers/gpu/drm/drm_dsc.c
> +++ b/drivers/gpu/drm/drm_dsc.c
> @@ -49,6 +49,17 @@ void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header)
>  }
>  EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
>  
> +void drm_dsc_dsi_pps_header_init(struct dsc_dce_header *dsc_header)

Kerneldoc for anything exported to drivers please, also ideally for all
the structures.

Thanks, Daniel
> +{
> +	memset(dsc_header, 0, sizeof(*dsc_header));
> +
> +	dsc_header->bp0 = 0x0A;
> +	dsc_header->bp1 = 1;
> +	dsc_header->bp4 = 10;
> +	dsc_header->bp6 = 128;
> +}
> +EXPORT_SYMBOL(drm_dsc_dsi_pps_header_init);
> +
>  /**
>   * drm_dsc_dp_rc_buffer_size - get rc buffer size in bytes
>   * @rc_buffer_block_size: block size code, according to DPCD offset 62h
> diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
> index bbe120f461e5..5a3bbeb3e12f 100644
> --- a/include/drm/drm_dsc.h
> +++ b/include/drm/drm_dsc.h
> @@ -602,8 +602,24 @@ struct drm_dsc_pps_infoframe {
>  	struct drm_dsc_picture_parameter_set pps_payload;
>  } __packed;
>  
> +struct dsc_dce_header {
> +	u8 bp0;
> +	u8 bp1;
> +	u8 bp2;
> +	u8 bp3;
> +	u8 bp4;
> +	u8 bp5;
> +	u8 bp6;
> +} __packed;
> +
> +struct drm_dsi_dsc_infoframe {
> +	struct dsc_dce_header dsc_header;
> +	struct drm_dsc_picture_parameter_set pps_payload;
> +} __packed;
> +
>  void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header);
>  int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size);
> +void drm_dsc_dsi_pps_header_init(struct dsc_dce_header *dsc_header);
>  void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_sdp,
>  				const struct drm_dsc_config *dsc_cfg);
>  int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
> -- 
> 2.26.3
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch