[PATCH v1 2/2 RESEND] gpu/drm: tegra: dsi: calculate packet parameters for video mode
From: Svyatoslav Ryhel
Date: Thu Dec 04 2025 - 01:14:49 EST
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@xxxxxxxxx>
---
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