Commit c223059e authored by Jessica Zhang's avatar Jessica Zhang Committed by Dmitry Baryshkov
Browse files

drm/msm/dpu: Fix slice_last_group_size calculation 



Correct the math for slice_last_group_size so that it matches the
calculations downstream.

Fixes: c110cfd1 ("drm/msm/disp/dpu1: Add support for DSC")
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: default avatarMarijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: default avatarJessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/539269/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-7-bafc7be95691@quicinc.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent 44346191

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c

+3 −2
Original line number Diff line number Diff line
@@ -56,9 +56,10 @@ static void dpu_hw_dsc_config(struct dpu_hw_dsc *hw_dsc, 
	if (is_cmd_mode)

		initial_lines += 1;



	slice_last_group_size = 3 - (dsc->slice_width % 3);

	slice_last_group_size = (dsc->slice_width + 2) % 3;



	data = (initial_lines << 20);

	data |= ((slice_last_group_size - 1) << 18);

	data |= (slice_last_group_size << 18);

	/* bpp is 6.4 format, 4 LSBs bits are for fractional part */

	data |= (dsc->bits_per_pixel << 8);

	data |= (dsc->block_pred_enable << 7);