[PATCH v2 3/8] drm/bridge: dw-hdmi: allow overriding of phy-type reading

[Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>]

In some IP implementations the reading of the phy-type may be broken.
One example are the Rockchip rk3228 and rk3328 socs that use a separate
phy from Innosilicon but still report the HDMI20_TX type.

So allow the glue driver to force a specific type, like the vendor-phy
for these cases.

Signed-off-by: Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 4 +++-
 include/drm/bridge/dw_hdmi.h              | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index f9802399cc0d..50d231626c4d 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2218,7 +2218,9 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
 	unsigned int i;
 	u8 phy_type;
 
-	phy_type = hdmi_readb(hdmi, HDMI_CONFIG2_ID);
+	phy_type = (hdmi->plat_data->phy_force_type) ?
+				hdmi->plat_data->phy_force_type :
+				hdmi_readb(hdmi, HDMI_CONFIG2_ID);
 
 	if (phy_type == DW_HDMI_PHY_VENDOR_PHY) {
 		/* Vendor PHYs require support from the glue layer. */
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index dd2a8cf7d20b..3c1dddb09b95 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -133,6 +133,7 @@ struct dw_hdmi_plat_data {
 	const struct dw_hdmi_phy_ops *phy_ops;
 	const char *phy_name;
 	void *phy_data;
+	u8 phy_force_type;
 
 	/* Synopsys PHY support */
 	const struct dw_hdmi_mpll_config *mpll_cfg;
-- 
2.15.1

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