Re: Re: [PATCH] drm/sun4i: dw-hdmi: Fix HDMI PHY clock setup

Hi!

Dne torek, 14. september 2021 ob 10:59:22 CEST je Ondřej Jirman napisal(a):

Hello Jernej,

On Mon, Sep 13, 2021 at 07:21:54PM +0200, Jernej Skrabec wrote:

quoted

Recent rework, which made HDMI PHY driver a platform device, inadvertely
reversed clock setup order. HW is very touchy about it. Proper way is to
handle controllers resets and clocks first and HDMI PHYs second.

Currently, without this fix, first mode set completely fails (nothing on
HDMI monitor) on H3 era PHYs. On H6, it still somehow work.

Move HDMI PHY reset & clocks handling to sun8i_hdmi_phy_init() which
will assure that code is executed after controllers reset & clocks are
handled. Additionally, add sun8i_hdmi_phy_deinit() which will deinit
them at controllers driver unload.

Tested on A64, H3, H6 and R40.

Fixes: 9bf3797796f5 ("drm/sun4i: dw-hdmi: Make HDMI PHY into a platform 

device")

quoted

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c  |  7 +-
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h  |  4 +-
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 97 ++++++++++++++------------
 3 files changed, 61 insertions(+), 47 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/

sun8i_dw_hdmi.c

quoted

index f75fb157f2ff..5fa5407ac583 100644

--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c

@@ -216,11 +216,13 @@ static int sun8i_dw_hdmi_bind(struct device *dev, 

struct device *master,

quoted

 		goto err_disable_clk_tmds;
 	}

^^^ This looks like...

quoted

+	ret = sun8i_hdmi_phy_init(hdmi->phy);
+	if (ret)
+		return ret;

... you need 'goto err_disable_clk_tmds;' here, instead.

Ah, right. Will fix in v2.

quoted

+
 	drm_encoder_helper_add(encoder, 

&sun8i_dw_hdmi_encoder_helper_funcs);

quoted

 	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
 
-	sun8i_hdmi_phy_init(hdmi->phy);
-
 	plat_data->mode_valid = hdmi->quirks->mode_valid;
 	plat_data->use_drm_infoframe = hdmi->quirks->use_drm_infoframe;
 	sun8i_hdmi_phy_set_ops(hdmi->phy, plat_data);

@@ -262,6 +264,7 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, 

struct device *master,

quoted

 	struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
 
 	dw_hdmi_unbind(hdmi->hdmi);
+	sun8i_hdmi_phy_deinit(hdmi->phy);
 	clk_disable_unprepare(hdmi->clk_tmds);
 	reset_control_assert(hdmi->rst_ctrl);
 	gpiod_set_value(hdmi->ddc_en, 0);

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/

sun8i_dw_hdmi.h

quoted

index 74f6ed0e2570..bffe1b9cd3dc 100644

--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h

@@ -169,6 +169,7 @@ struct sun8i_hdmi_phy {
 	struct clk			*clk_phy;
 	struct clk			*clk_pll0;
 	struct clk			*clk_pll1;
+	struct device			*dev;
 	unsigned int			rcal;
 	struct regmap			*regs;
 	struct reset_control		*rst_phy;

@@ -205,7 +206,8 @@ encoder_to_sun8i_dw_hdmi(struct drm_encoder *encoder)
 
 int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node 

*node);

quoted

 
-void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy);
+int sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy);
+void sun8i_hdmi_phy_deinit(struct sun8i_hdmi_phy *phy);
 void sun8i_hdmi_phy_set_ops(struct sun8i_hdmi_phy *phy,
 			    struct dw_hdmi_plat_data *plat_data);
 

diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/

sun4i/sun8i_hdmi_phy.c

quoted

index c9239708d398..78b152973957 100644

--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c

@@ -506,9 +506,60 @@ static void sun8i_hdmi_phy_init_h3(struct 

sun8i_hdmi_phy *phy)

quoted

 	phy->rcal = (val & SUN8I_HDMI_PHY_ANA_STS_RCAL_MASK) >> 2;
 }
 
-void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy)
+int sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy)
 {
+	int ret;
+
+	ret = reset_control_deassert(phy->rst_phy);
+	if (ret) {
+		dev_err(phy->dev, "Cannot deassert phy reset control: 

%d\n", ret);

quoted

+		return ret;
+	}
+
+	ret = clk_prepare_enable(phy->clk_bus);
+	if (ret) {
+		dev_err(phy->dev, "Cannot enable bus clock: %d\n", 

ret);

quoted

+		goto err_deassert_rst_phy;

I know it was there before, but please:

s/deassert/assert/

Ok.

Best regards,
Jernej

kind regards,
	o.

quoted

+	}
+
+	ret = clk_prepare_enable(phy->clk_mod);
+	if (ret) {
+		dev_err(phy->dev, "Cannot enable mod clock: %d\n", 

ret);

quoted

+		goto err_disable_clk_bus;
+	}
+
+	if (phy->variant->has_phy_clk) {
+		ret = sun8i_phy_clk_create(phy, phy->dev,
+					   phy->variant-

has_second_pll);

quoted

+		if (ret) {
+			dev_err(phy->dev, "Couldn't create the PHY 

clock\n");

quoted

+			goto err_disable_clk_mod;
+		}
+
+		clk_prepare_enable(phy->clk_phy);
+	}
+
 	phy->variant->phy_init(phy);
+
+	return 0;
+
+err_disable_clk_mod:
+	clk_disable_unprepare(phy->clk_mod);
+err_disable_clk_bus:
+	clk_disable_unprepare(phy->clk_bus);
+err_deassert_rst_phy:
+	reset_control_assert(phy->rst_phy);
+
+	return ret;
+}
+

[......]

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