From 2d86dd0a15aa2863be82eaf3372e269e30e379f0 Mon Sep 17 00:00:00 2001 From: Jonathan Marek Date: Mon, 7 Oct 2024 01:01:48 -0400 Subject: [PATCH] drm/msm/dsi: improve/fix dsc pclk calculation BugLink: https://bugs.launchpad.net/bugs/2097575 [ Upstream commit 24436a540d16ca6a523b8e5441180001c31b6b35 ] drm_mode_vrefresh() can introduce a large rounding error, avoid it. Fixes: 7c9e4a554d4a ("drm/msm/dsi: Reduce pclk rate for compression") Signed-off-by: Jonathan Marek Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar Patchwork: https://patchwork.freedesktop.org/patch/618432/ Link: https://lore.kernel.org/r/20241007050157.26855-1-jonathan@marek.ca Signed-off-by: Abhinav Kumar Signed-off-by: Sasha Levin Signed-off-by: Manuel Diewald Signed-off-by: Stefan Bader --- drivers/gpu/drm/msm/dsi/dsi_host.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 4fce8f9510e6..d2b414bcff93 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -537,7 +537,7 @@ 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,