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Commit b8be0bdb authored by Thierry Reding's avatar Thierry Reding
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drm/tegra: dsi: Use proper back-porch for non-sync video mode 



In video modes without sync pulses, the horizontal back-porch needs to
include the horizontal sync width.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 472a6d1f

drivers/gpu/drm/tegra/dsi.c

+7 −2
Original line number Diff line number Diff line
@@ -548,14 +548,19 @@ static void tegra_dsi_configure(struct tegra_dsi *dsi, unsigned int pipe, 


		/* horizontal sync width */

		hsw = (mode->hsync_end - mode->hsync_start) * mul / div;

		hsw -= 10;



		/* horizontal back porch */

		hbp = (mode->htotal - mode->hsync_end) * mul / div;

		hbp -= 14;



		if ((dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) == 0)

			hbp += hsw;



		/* horizontal front porch */

		hfp = (mode->hsync_start - mode->hdisplay) * mul / div;



		/* subtract packet overhead */

		hsw -= 10;

		hbp -= 14;

		hfp -= 8;



		tegra_dsi_writel(dsi, hsw << 16 | 0, DSI_PKT_LEN_0_1);