From: Svyatoslav Ryhel <clamor95@gmail.com>
Date: Tue, 9 Sep 2025 07:33:35 +0000 (+0300)
Subject: drm/tegra: dsi: Calculate packet parameters for video mode
X-Git-Tag: v6.19-rc1~157^2~1^2~120
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ef8ff0429a1fc4e7fb899208f49c719ed8293f81;p=thirdparty%2Fkernel%2Flinux.git

drm/tegra: dsi: Calculate packet parameters for video mode

Calculate packet parameters for video mode same way it is done for
command mode, by halving timings plugged into equations.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/20250909073335.91531-3-clamor95@gmail.com
---

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 368a3be59c6c8..ae13b7a6837c0 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -546,12 +546,19 @@ static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe,
 		/* horizontal back porch */
 		hbp = (mode->htotal - mode->hsync_end) * mul / div;
 
-		if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
-			hbp += hsw;
-
 		/* horizontal front porch */
 		hfp = (mode->hsync_start - mode->hdisplay) * mul / div;
 
+		if (dsi->master || dsi->slave) {
+			hact /= 2;
+			hsw /= 2;
+			hbp /= 2;
+			hfp /= 2;
+		}
+
+		if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)
+			hbp += hsw;
+
 		/* subtract packet overhead */
 		hsw -= 10;
 		hbp -= 14;