[PATCH v7 5/8] drm/msm/dpu: Use DRM DSC helper for det_thresh_flatness

[Marijn Suijten]

Title suggestion: Use **fixed** MSM DSC helper...

To make it clear that this is a bugfix without having to read the commit
description first.

- Marijn

On 2023-05-09 15:06:51, Jessica Zhang wrote:
> The current dpu_hw_dsc calculation for det_thresh_flatness does not
> match the downstream calculation or the DSC spec.
> 
> Use the DRM DSC helper for det_thresh_flatness to match downstream
> implementation and the DSC spec.
> 
> Fixes: c110cfd1753e ("drm/msm/disp/dpu1: Add support for DSC")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> Reviewed-by: Marijn Suijten <marijn.suijten at somainline.org>
> Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
> index 4e1396575e6a..1e11c0fb0545 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
> @@ -3,6 +3,8 @@
>   * Copyright (c) 2020-2022, Linaro Limited
>   */
>  
> +#include <drm/display/drm_dsc_helper.h>
> +
>  #include "dpu_kms.h"
>  #include "dpu_hw_catalog.h"
>  #include "dpu_hwio.h"
> @@ -102,7 +104,7 @@ static void dpu_hw_dsc_config(struct dpu_hw_dsc *hw_dsc,
>  	data |= dsc->final_offset;
>  	DPU_REG_WRITE(c, DSC_DSC_OFFSET, data);
>  
> -	det_thresh_flatness = 7 + 2 * (dsc->bits_per_component - 8);
> +	det_thresh_flatness = drm_dsc_calculate_flatness_det_thresh(dsc);
>  	data = det_thresh_flatness << 10;
>  	data |= dsc->flatness_max_qp << 5;
>  	data |= dsc->flatness_min_qp;
> 
> -- 
> 2.40.1
>