From: Svyatoslav Ryhel <clamor95@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
Thierry Reding <treding@nvidia.com>,
Mikko Perttunen <mperttunen@nvidia.com>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Jonathan Hunter <jonathanh@nvidia.com>,
Svyatoslav Ryhel <clamor95@gmail.com>
Cc: dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v1 2/2] gpu/drm: tegra: dsi: calculate packet parameters for video mode
Date: Tue, 9 Sep 2025 10:33:35 +0300 [thread overview]
Message-ID: <20250909073335.91531-3-clamor95@gmail.com> (raw)
In-Reply-To: <20250909073335.91531-1-clamor95@gmail.com>
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@gmail.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
prev parent reply other threads:[~2025-09-09 7:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-09 7:33 [PATCH v1 0/2] tegra: dsi: improvements for video mode ganged panels Svyatoslav Ryhel
2025-09-09 7:33 ` [PATCH v1 1/2] gpu/drm: tegra: dsi: make SOL delay calculation mode independent Svyatoslav Ryhel
2025-09-09 7:33 ` Svyatoslav Ryhel [this message]
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