drm: bridge/dw_hdmi: add function dw_hdmi_phy_enable_spare

RK3288 HDMI will not work without the spare bit of
HDMI_PHY_CONF0 enable

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

2 files changed, 9 insertions, 1 deletions

diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
index d39dccd41e5a..3a97c8419d4f 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.c
+++ b/drivers/gpu/drm/bridge/dw_hdmi.c
@@ -713,6 +713,13 @@ static void dw_hdmi_phy_enable_tmds(struct dw_hdmi *hdmi, u8 enable)
                          HDMI_PHY_CONF0_ENTMDS_MASK);
 }
 
+static void dw_hdmi_phy_enable_spare(struct dw_hdmi *hdmi, u8 enable)
+{
+        hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
+                         HDMI_PHY_CONF0_SPARECTRL_OFFSET,
+                         HDMI_PHY_CONF0_SPARECTRL_MASK);
+}
+
 static void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable)
 {
         hdmi_mask_writeb(hdmi, enable, HDMI_PHY_CONF0,
diff --git a/drivers/gpu/drm/bridge/dw_hdmi.h b/drivers/gpu/drm/bridge/dw_hdmi.h
index baa7849851d4..175dbc89a824 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.h
+++ b/drivers/gpu/drm/bridge/dw_hdmi.h
@@ -837,7 +837,8 @@ enum {
         HDMI_PHY_CONF0_PDZ_OFFSET = 7,
         HDMI_PHY_CONF0_ENTMDS_MASK = 0x40,
         HDMI_PHY_CONF0_ENTMDS_OFFSET = 6,
-        HDMI_PHY_CONF0_SPARECTRL = 0x20,
+        HDMI_PHY_CONF0_SPARECTRL_MASK = 0x20,
+        HDMI_PHY_CONF0_SPARECTRL_OFFSET = 5,
         HDMI_PHY_CONF0_GEN2_PDDQ_MASK = 0x10,
         HDMI_PHY_CONF0_GEN2_PDDQ_OFFSET = 4,
         HDMI_PHY_CONF0_GEN2_TXPWRON_MASK = 0x8,