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drm/bridge: ti-sn65dsi86: Reject modes with too large blanking

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The front and back porch registers are 8 bits, and pulse width registers
are 15 bits, so reject any modes with larger periods.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220831082653.20449-2-tomi.valkeinen@ideasonboard.com
This commit is contained in:
Tomi Valkeinen
2022-08-31 11:26:51 +03:00
committed by Robert Foss
parent e06a46087d
commit 3fc307dcec
1 changed files with 23 additions and 0 deletions
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23
drivers/gpu/drm/bridge/ti-sn65dsi86.c
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@@ -747,6 +747,29 @@ ti_sn_bridge_mode_valid(struct drm_bridge *bridge,
if (mode->clock > 594000) if (mode->clock > 594000)
return MODE_CLOCK_HIGH; return MODE_CLOCK_HIGH;
/*
* The front and back porch registers are 8 bits, and pulse width
* registers are 15 bits, so reject any modes with larger periods.
*/
if ((mode->hsync_start - mode->hdisplay) > 0xff)
return MODE_HBLANK_WIDE;
if ((mode->vsync_start - mode->vdisplay) > 0xff)
return MODE_VBLANK_WIDE;
if ((mode->hsync_end - mode->hsync_start) > 0x7fff)
return MODE_HSYNC_WIDE;
if ((mode->vsync_end - mode->vsync_start) > 0x7fff)
return MODE_VSYNC_WIDE;
if ((mode->htotal - mode->hsync_end) > 0xff)
return MODE_HBLANK_WIDE;
if ((mode->vtotal - mode->vsync_end) > 0xff)
return MODE_VBLANK_WIDE;
return MODE_OK; return MODE_OK;
} }