[Freedreno] [PATCH v5 1/8] drm/msm/dsi: use new helpers for DSC setup

[Jessica Zhang]

On 4/12/2023 12:10 PM, Dmitry Baryshkov wrote:
> On 12/04/2023 22:09, Jessica Zhang wrote:
>> From: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
>>
>> Use new DRM DSC helpers to setup DSI DSC configuration. The
>> initial_scale_value needs to be adjusted according to the standard, but
>> this is a separate change.
>>
>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> 
> Since you are resending this patch, you should also include your S-o-b tag.

Hi Dmitry,

Acked.

Thanks,

Jessica Zhang

> 
>> ---
>>   drivers/gpu/drm/msm/dsi/dsi_host.c | 61 
>> +++++---------------------------------
>>   1 file changed, 8 insertions(+), 53 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c 
>> b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> index 961689a255c4..74d38f90398a 100644
>> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
>> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
>> @@ -1731,28 +1731,9 @@ static int dsi_host_parse_lane_data(struct 
>> msm_dsi_host *msm_host,
>>       return -EINVAL;
>>   }
>> -static u32 dsi_dsc_rc_buf_thresh[DSC_NUM_BUF_RANGES - 1] = {
>> -    0x0e, 0x1c, 0x2a, 0x38, 0x46, 0x54, 0x62,
>> -    0x69, 0x70, 0x77, 0x79, 0x7b, 0x7d, 0x7e
>> -};
>> -
>> -/* only 8bpc, 8bpp added */
>> -static char min_qp[DSC_NUM_BUF_RANGES] = {
>> -    0, 0, 1, 1, 3, 3, 3, 3, 3, 3, 5, 5, 5, 7, 13
>> -};
>> -
>> -static char max_qp[DSC_NUM_BUF_RANGES] = {
>> -    4, 4, 5, 6, 7, 7, 7, 8, 9, 10, 11, 12, 13, 13, 15
>> -};
>> -
>> -static char bpg_offset[DSC_NUM_BUF_RANGES] = {
>> -    2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
>> -};
>> -
>>   static int dsi_populate_dsc_params(struct msm_dsi_host *msm_host, 
>> struct drm_dsc_config *dsc)
>>   {
>> -    int i;
>> -    u16 bpp = dsc->bits_per_pixel >> 4;
>> +    int ret;
>>       if (dsc->bits_per_pixel & 0xf) {
>>           DRM_DEV_ERROR(&msm_host->pdev->dev, "DSI does not support 
>> fractional bits_per_pixel\n");
>> @@ -1764,49 +1745,23 @@ static int dsi_populate_dsc_params(struct 
>> msm_dsi_host *msm_host, struct drm_dsc
>>           return -EOPNOTSUPP;
>>       }
>> -    dsc->rc_model_size = 8192;
>> -    dsc->first_line_bpg_offset = 12;
>> -    dsc->rc_edge_factor = 6;
>> -    dsc->rc_tgt_offset_high = 3;
>> -    dsc->rc_tgt_offset_low = 3;
>>       dsc->simple_422 = 0;
>>       dsc->convert_rgb = 1;
>>       dsc->vbr_enable = 0;
>> -    /* handle only bpp = bpc = 8 */
>> -    for (i = 0; i < DSC_NUM_BUF_RANGES - 1 ; i++)
>> -        dsc->rc_buf_thresh[i] = dsi_dsc_rc_buf_thresh[i];
>> +    drm_dsc_set_const_params(dsc);
>> +    drm_dsc_set_rc_buf_thresh(dsc);
>> -    for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
>> -        dsc->rc_range_params[i].range_min_qp = min_qp[i];
>> -        dsc->rc_range_params[i].range_max_qp = max_qp[i];
>> -        /*
>> -         * Range BPG Offset contains two's-complement signed values 
>> that fill
>> -         * 8 bits, yet the registers and DCS PPS field are only 6 
>> bits wide.
>> -         */
>> -        dsc->rc_range_params[i].range_bpg_offset = bpg_offset[i] & 
>> DSC_RANGE_BPG_OFFSET_MASK;
>> +    /* handle only bpp = bpc = 8, pre-SCR panels */
>> +    ret = drm_dsc_setup_rc_params(dsc, DRM_DSC_1_1_PRE_SCR);
>> +    if (ret) {
>> +        DRM_DEV_ERROR(&msm_host->pdev->dev, "could not find DSC RC 
>> parameters\n");
>> +        return ret;
>>       }
>> -    dsc->initial_offset = 6144;        /* Not bpp 12 */
>> -    if (bpp != 8)
>> -        dsc->initial_offset = 2048;    /* bpp = 12 */
>> -
>> -    if (dsc->bits_per_component <= 10)
>> -        dsc->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
>> -    else
>> -        dsc->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
>> -
>> -    dsc->initial_xmit_delay = 512;
>>       dsc->initial_scale_value = 32;
>> -    dsc->first_line_bpg_offset = 12;
>>       dsc->line_buf_depth = dsc->bits_per_component + 1;
>> -    /* bpc 8 */
>> -    dsc->flatness_min_qp = 3;
>> -    dsc->flatness_max_qp = 12;
>> -    dsc->rc_quant_incr_limit0 = 11;
>> -    dsc->rc_quant_incr_limit1 = 11;
>> -
>>       return drm_dsc_compute_rc_parameters(dsc);
>>   }
>>
> 
> -- 
> With best wishes
> Dmitry
>