Currently, mode_valid hook returns all mode as valid. Add the check
for the maximum and minimum pixel clock that the bridge can support
while validating a mode.
Signed-off-by: Jayesh Choudhary <j-choudhary@xxxxxx>
---
drivers/gpu/drm/bridge/sii902x.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 8f84e98249c7..658819199c84 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -163,6 +163,16 @@
#define SII902X_AUDIO_PORT_INDEX 3
+/*
+ * The maximum resolution supported by the HDMI bridge is 1080p@60Hz
+ * and 1920x1200 requiring a pixel clock of 165MHz and the minimum
+ * resolution supported is 480p@60Hz requiring a pixel clock of 25MHz
+ *
+ * (drm_display_mode clock is in kHz)
+ */
+#define SII902X_MIN_PIXEL_CLOCK 25000
+#define SII902X_MAX_PIXEL_CLOCK 165000
+
struct sii902x {
struct i2c_client *i2c;
struct regmap *regmap;
@@ -313,7 +323,11 @@ static int sii902x_get_modes(struct drm_connector *connector)
static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
- /* TODO: check mode */
+ if (mode->clock < SII902X_MIN_PIXEL_CLOCK)
+ return MODE_CLOCK_LOW;
+
+ if (mode->clock > SII902X_MAX_PIXEL_CLOCK)
+ return MODE_CLOCK_HIGH;
return MODE_OK;
}
--
2.25.1
