The maximum pixel clock depends on the version of the connected MHL
adapter. Add mode_valid callback to filter out modes with too high pixel
clock to avoid failure in mode_fixup later.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/bridge/sil-sii8620.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index b7eb704d0a8a..268d66d99337 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -2191,6 +2191,19 @@ static void sii8620_detach(struct drm_bridge *bridge)
rc_unregister_device(ctx->rc_dev);
}
+static enum drm_mode_status sii8620_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode)
+{
+ struct sii8620 *ctx = bridge_to_sii8620(bridge);
+ bool can_pack = ctx->devcap[MHL_DCAP_VID_LINK_MODE] &
+ MHL_DCAP_VID_LINK_PPIXEL;
+ unsigned int max_pclk = sii8620_is_mhl3(ctx) ? MHL3_MAX_LCLK :
+ MHL1_MAX_LCLK;
+ max_pclk /= can_pack ? 2 : 3;
+
+ return (mode->clock > max_pclk) ? MODE_CLOCK_HIGH : MODE_OK;
+}
+
static bool sii8620_mode_fixup(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
@@ -2238,6 +2251,7 @@ static const struct drm_bridge_funcs sii8620_bridge_funcs = {
.attach = sii8620_attach,
.detach = sii8620_detach,
.mode_fixup = sii8620_mode_fixup,
+ .mode_valid = sii8620_mode_valid,
};
static int sii8620_probe(struct i2c_client *client,
--
2.14.2
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