[PATCH v4 2/2] drm/bridge: Add pixel clock check in atomic_check

[Jayesh Choudhary]

Check the pixel clock for the mode in atomic_check and ensure that
it is within the range supported by the bridge.

Signed-off-by: Jayesh Choudhary <j-choudhary@xxxxxx>
---
 drivers/gpu/drm/bridge/sii902x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 6a6055a4ccf9..1bf2f14a772d 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -494,6 +494,12 @@ static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
 				       struct drm_crtc_state *crtc_state,
 				       struct drm_connector_state *conn_state)
 {
+	if (crtc_state->mode.clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
+		return MODE_CLOCK_LOW;
+
+	if (crtc_state->mode.clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
+		return MODE_CLOCK_HIGH;
+
 	/*
 	 * There might be flags negotiation supported in future but
 	 * set the bus flags in atomic_check statically for now.
-- 
2.25.1