drm/i2c: tda998x: add some basic mode validation
The TDA998x can't handle modes with clocks above 150MHz, or resolutions
larger than 8192x2048.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 3ff7d07..5a738ad 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -810,6 +810,12 @@
tda998x_encoder_mode_valid(struct drm_encoder *encoder,
struct drm_display_mode *mode)
{
+ if (mode->clock > 150000)
+ return MODE_CLOCK_HIGH;
+ if (mode->htotal >= BIT(13))
+ return MODE_BAD_HVALUE;
+ if (mode->vtotal >= BIT(11))
+ return MODE_BAD_VVALUE;
return MODE_OK;
}