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

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[ Upstream commit 24436a540d ]

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

Fixes: 7c9e4a554d ("drm/msm/dsi: Reduce pclk rate for compression")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav 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: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Marek
2024-10-07 01:01:48 -04:00
committed by Greg Kroah-Hartman
parent a81f13a299
commit 92c72b8f76
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/msm/dsi/dsi_host.c
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@@ -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,