Currently, mode_valid hook returns all mode as valid and it is
defined only in drm_connector_helper_funcs. With the introduction of
'DRM_BRIDGE_ATTACH_NO_CONNECTOR', connector is not initialized in
bridge_attach call for cases when the encoder has this flag enabled.
So add the mode_valid hook in drm_bridge_funcs as well with proper
clock checks for maximum and minimum pixel clock supported by the
bridge.
Signed-off-by: Jayesh Choudhary <j-choudhary@xxxxxx>
---
drivers/gpu/drm/bridge/sii902x.c | 38 ++++++++++++++++++++++++++++++--
1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 2fbeda9025bf..ef7c3ab3386c 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -163,6 +163,14 @@
#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
+ */
+#define SII902X_MIN_PIXEL_CLOCK_KHZ 25000
+#define SII902X_MAX_PIXEL_CLOCK_KHZ 165000
+
struct sii902x {
struct i2c_client *i2c;
struct regmap *regmap;
@@ -310,12 +318,26 @@ static int sii902x_get_modes(struct drm_connector *connector)
return num;
}
+static enum
+drm_mode_status sii902x_validate(struct sii902x *sii902x,
+ const struct drm_display_mode *mode)
+{
+ if (mode->clock < SII902X_MIN_PIXEL_CLOCK_KHZ)
+ return MODE_CLOCK_LOW;
+
+ if (mode->clock > SII902X_MAX_PIXEL_CLOCK_KHZ)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
- /* TODO: check mode */
+ struct sii902x *sii902x = connector_to_sii902x(connector);
+ const struct drm_display_mode *mod = mode;
- return MODE_OK;
+ return sii902x_validate(sii902x, mod);
}
static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
@@ -499,11 +521,22 @@ static int sii902x_bridge_atomic_check(struct drm_bridge *bridge,
* There might be flags negotiation supported in future but
* set the bus flags in atomic_check statically for now.
*/
+
bridge_state->input_bus_cfg.flags = bridge->timings->input_bus_flags;
return 0;
}
+static enum drm_mode_status
+sii902x_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_info *info,
+ const struct drm_display_mode *mode)
+{
+ struct sii902x *sii902x = bridge_to_sii902x(bridge);
+
+ return sii902x_validate(sii902x, mode);
+}
+
static const struct drm_bridge_funcs sii902x_bridge_funcs = {
.attach = sii902x_bridge_attach,
.mode_set = sii902x_bridge_mode_set,
@@ -516,6 +549,7 @@ static const struct drm_bridge_funcs sii902x_bridge_funcs = {
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_get_input_bus_fmts = sii902x_bridge_atomic_get_input_bus_fmts,
.atomic_check = sii902x_bridge_atomic_check,
+ .mode_valid = sii902x_bridge_mode_valid,
};
static int sii902x_mute(struct sii902x *sii902x, bool mute)
--
2.25.1
