linux-kernel - [PATCH v1 2/2 RESEND] gpu/drm: tegra: dsi: calculate packet parameters for video mode

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Message-ID: <20251204061436.5401-3-clamor95@gmail.com>
Date: Thu,  4 Dec 2025 08:14:36 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Thierry Reding <thierry.reding@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Mikko Perttunen <mperttunen@...dia.com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Svyatoslav Ryhel <clamor95@...il.com>
Cc: dri-devel@...ts.freedesktop.org,
	linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/2 RESEND] gpu/drm: tegra: dsi: calculate packet parameters for video mode

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

Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
---
 drivers/gpu/drm/tegra/dsi.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index aab555a2eb68..1ec3f03d2577 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -545,12 +545,19 @@ 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;
-- 
2.48.1