linux-kernel - [PATCH v3 3/4] drm: bridge: dw_hdmi: add reset function for PHY GEN1

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Date:   Fri, 15 Apr 2022 10:42:49 +0800
From:   Sandor.yu@....com
To:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        andrzej.hajda@...el.com, narmstrong@...libre.com,
        robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, hverkuil-cisco@...all.nl
Cc:     Sandor.yu@....com, shengjiu.wang@....com, cai.huoqing@...ux.dev,
        maxime@...no.tech, harry.wentland@....com
Subject: [PATCH v3 3/4] drm: bridge: dw_hdmi: add reset function for PHY GEN1

From: Sandor Yu <Sandor.yu@....com>

PHY reset register(MC_PHYRSTZ) active high reset control for PHY GEN2,
and active low reset control for PHY GEN1.

Rename function dw_hdmi_phy_reset to dw_hdmi_phy_gen2_reset.
Add dw_hdmi_phy_gen1_reset function for PHY GEN1.

Signed-off-by: Sandor Yu <Sandor.yu@....com>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 14 +++++++++++---
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c    |  2 +-
 include/drm/bridge/dw_hdmi.h              |  4 +++-
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 312500921754..ac98605a6811 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1374,13 +1374,21 @@ static void dw_hdmi_phy_sel_interface_control(struct dw_hdmi *hdmi, u8 enable)
 			 HDMI_PHY_CONF0_SELDIPIF_MASK);
 }
 
-void dw_hdmi_phy_reset(struct dw_hdmi *hdmi)
+void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi)
+{
+	/* PHY reset. The reset signal is active low on Gen1 PHYs. */
+	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
+	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
+}
+EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen1_reset);
+
+void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi)
 {
 	/* PHY reset. The reset signal is active high on Gen2 PHYs. */
 	hdmi_writeb(hdmi, HDMI_MC_PHYRSTZ_PHYRSTZ, HDMI_MC_PHYRSTZ);
 	hdmi_writeb(hdmi, 0, HDMI_MC_PHYRSTZ);
 }
-EXPORT_SYMBOL_GPL(dw_hdmi_phy_reset);
+EXPORT_SYMBOL_GPL(dw_hdmi_phy_gen2_reset);
 
 void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address)
 {
@@ -1534,7 +1542,7 @@ static int hdmi_phy_configure(struct dw_hdmi *hdmi,
 	if (phy->has_svsret)
 		dw_hdmi_phy_enable_svsret(hdmi, 1);
 
-	dw_hdmi_phy_reset(hdmi);
+	dw_hdmi_phy_gen2_reset(hdmi);
 
 	hdmi_writeb(hdmi, HDMI_MC_HEACPHY_RST_ASSERT, HDMI_MC_HEACPHY_RST);
 
diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
index 5e2b0175df36..2860e6bff8b7 100644
--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
@@ -135,7 +135,7 @@ static int sun8i_hdmi_phy_config_a83t(struct dw_hdmi *hdmi,
 	dw_hdmi_phy_gen2_txpwron(hdmi, 0);
 	dw_hdmi_phy_gen2_pddq(hdmi, 1);
 
-	dw_hdmi_phy_reset(hdmi);
+	dw_hdmi_phy_gen2_reset(hdmi);
 
 	dw_hdmi_phy_gen2_pddq(hdmi, 0);
 
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
index 2a1f85f9a8a3..70082f80a8c8 100644
--- a/include/drm/bridge/dw_hdmi.h
+++ b/include/drm/bridge/dw_hdmi.h
@@ -187,9 +187,11 @@ void dw_hdmi_phy_i2c_set_addr(struct dw_hdmi *hdmi, u8 address);
 void dw_hdmi_phy_i2c_write(struct dw_hdmi *hdmi, unsigned short data,
 			   unsigned char addr);
 
+void dw_hdmi_phy_gen1_reset(struct dw_hdmi *hdmi);
+
 void dw_hdmi_phy_gen2_pddq(struct dw_hdmi *hdmi, u8 enable);
 void dw_hdmi_phy_gen2_txpwron(struct dw_hdmi *hdmi, u8 enable);
-void dw_hdmi_phy_reset(struct dw_hdmi *hdmi);
+void dw_hdmi_phy_gen2_reset(struct dw_hdmi *hdmi);
 
 enum drm_connector_status dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi,
 					       void *data);
-- 
2.25.1