Commit 24436a54 authored by Jonathan Marek's avatar Jonathan Marek Committed by Abhinav Kumar
Browse files

drm/msm/dsi: improve/fix dsc pclk calculation 



drm_mode_vrefresh() can introduce a large rounding error, avoid it.

Fixes: 7c9e4a55 ("drm/msm/dsi: Reduce pclk rate for compression")
Signed-off-by: default avatarJonathan Marek <jonathan@marek.ca>
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: default avatarAbhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/618432/
Link: https://lore.kernel.org/r/20241007050157.26855-1-jonathan@marek.ca


Signed-off-by: default avatarAbhinav Kumar <quic_abhinavk@quicinc.com>
parent f260ed88

drivers/gpu/drm/msm/dsi/dsi_host.c

+1 −1
Original line number Diff line number Diff line
@@ -542,7 +542,7 @@ static unsigned long dsi_adjust_pclk_for_compression(const struct drm_display_mo 


	int new_htotal = mode->htotal - mode->hdisplay + new_hdisplay;



	return new_htotal * mode->vtotal * drm_mode_vrefresh(mode);

	return mult_frac(mode->clock * 1000u, new_htotal, mode->htotal);

}



static unsigned long dsi_get_pclk_rate(const struct drm_display_mode *mode,