[PATCH v7 2/8] drm/display/dsc: add helper to set semi-const parameters

[Jessica Zhang]

On 5/9/2023 11:29 PM, Marijn Suijten wrote:
> On 2023-05-09 15:06:48, Jessica Zhang wrote:
>> From: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
>>
>> Add a helper setting config values which are typically constant across
>> operating modes (table E-4 of the standard) and mux_word_size (which is
>> a const according to 3.5.2).
>>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
>> Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
> 
> Same question about ordering.

Hi Marijn,

This patch was authored by Dmitry and originally part of his DRM DSC 
helpers series [1], but was removed from that series for mergeability 
reasons.

Looking over the kernel documentation, the last Signed-off-by should be 
from the patch submitter [2], so I think my s-o-b tag should be at the 
bottom.

As for the order in the previous patch, I can add a duplicate s-o-b 
before Dmitry's so that it reflects the history of the patch.

Thanks,

Jessica Zhang

[1] https://patchwork.freedesktop.org/patch/530512/?series=114472&rev=4
[2] 
https://www.kernel.org/doc/html/latest/process/submitting-patches.html#when-to-use-acked-by-cc-and-co-developed-by

> 
> Reviewed-by:  Marijn Suijten <marijn.suijten at somainline.org>
> 
>> ---
>>   drivers/gpu/drm/display/drm_dsc_helper.c | 22 ++++++++++++++++++++++
>>   include/drm/display/drm_dsc_helper.h     |  1 +
>>   2 files changed, 23 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c b/drivers/gpu/drm/display/drm_dsc_helper.c
>> index 65e810a54257..b9c4e10ced41 100644
>> --- a/drivers/gpu/drm/display/drm_dsc_helper.c
>> +++ b/drivers/gpu/drm/display/drm_dsc_helper.c
>> @@ -270,6 +270,28 @@ void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_payload,
>>   }
>>   EXPORT_SYMBOL(drm_dsc_pps_payload_pack);
>>   
>> +/**
>> + * drm_dsc_set_const_params() - Set DSC parameters considered typically
>> + * constant across operation modes
>> + *
>> + * @vdsc_cfg:
>> + * DSC Configuration data partially filled by driver
>> + */
>> +void drm_dsc_set_const_params(struct drm_dsc_config *vdsc_cfg)
>> +{
>> +	if (!vdsc_cfg->rc_model_size)
>> +		vdsc_cfg->rc_model_size = DSC_RC_MODEL_SIZE_CONST;
>> +	vdsc_cfg->rc_edge_factor = DSC_RC_EDGE_FACTOR_CONST;
>> +	vdsc_cfg->rc_tgt_offset_high = DSC_RC_TGT_OFFSET_HI_CONST;
>> +	vdsc_cfg->rc_tgt_offset_low = DSC_RC_TGT_OFFSET_LO_CONST;
>> +
>> +	if (vdsc_cfg->bits_per_component <= 10)
>> +		vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
>> +	else
>> +		vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
>> +}
>> +EXPORT_SYMBOL(drm_dsc_set_const_params);
>> +
>>   /* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
>>   static const u16 drm_dsc_rc_buf_thresh[] = {
>>   	896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
>> diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
>> index 422135a33d65..bfa7f3acafcb 100644
>> --- a/include/drm/display/drm_dsc_helper.h
>> +++ b/include/drm/display/drm_dsc_helper.h
>> @@ -21,6 +21,7 @@ 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_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_sdp,
>>   			      const struct drm_dsc_config *dsc_cfg);
>> +void drm_dsc_set_const_params(struct drm_dsc_config *vdsc_cfg);
>>   void drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg);
>>   int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params_kind kind);
>>   int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
>>
>> -- 
>> 2.40.1
>>