drm/i2c: tda998x: add some basic mode validation

[karo-tx-linux.git] / drivers / gpu / drm / i2c / tda998x_drv.c

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 3ff7d0713bfb68b646007e4fb677639e15ef5a79..5a738ad0c241605e097c981d6e38d5cd0e6ae726 100644 (file)
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -810,6 +810,12 @@ static int
 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;
 }