[PATCH v8 10/15] drm/sun4i: sun6i_mipi_dsi: Add has_mod_clk quirk

[Jagan Teki]

As per the user manual, look like mod clock is not mandatory
for all Allwinner MIPI DSI controllers, it is connected to
CLK_DSI_SCLK for A31 and not available in A64.

So add has_mod_clk quirk and process the clk accordingly.

Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
Tested-by: Merlijn Wajer <merlijn@xxxxxxxxxx>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 38 ++++++++++++++++++--------
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h |  5 ++++
 2 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index f42ea806f6c8..2a63e96aaff9 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -10,6 +10,7 @@
 #include <linux/component.h>
 #include <linux/crc-ccitt.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
@@ -1126,6 +1127,7 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 	dsi->dev = dev;
 	dsi->host.ops = &sun6i_dsi_host_ops;
 	dsi->host.dev = dev;
+	dsi->variant = of_device_get_match_data(dev);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
@@ -1153,17 +1155,20 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 		return PTR_ERR(dsi->reset);
 	}
 
-	dsi->mod_clk = devm_clk_get(dev, "mod");
-	if (IS_ERR(dsi->mod_clk)) {
-		dev_err(dev, "Couldn't get the DSI mod clock\n");
-		return PTR_ERR(dsi->mod_clk);
+	if (dsi->variant->has_mod_clk) {
+		dsi->mod_clk = devm_clk_get(dev, "mod");
+		if (IS_ERR(dsi->mod_clk)) {
+			dev_err(dev, "Couldn't get the DSI mod clock\n");
+			return PTR_ERR(dsi->mod_clk);
+		}
 	}
 
 	/*
 	 * In order to operate properly, that clock seems to be always
 	 * set to 297MHz.
 	 */
-	clk_set_rate_exclusive(dsi->mod_clk, 297000000);
+	if (dsi->variant->has_mod_clk)
+		clk_set_rate_exclusive(dsi->mod_clk, 297000000);
 
 	dsi->dphy = devm_phy_get(dev, "dphy");
 	if (IS_ERR(dsi->dphy)) {
@@ -1193,7 +1198,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 err_pm_disable:
 	pm_runtime_disable(dev);
 err_unprotect_clk:
-	clk_rate_exclusive_put(dsi->mod_clk);
+	if (dsi->variant->has_mod_clk)
+		clk_rate_exclusive_put(dsi->mod_clk);
 	return ret;
 }
 
@@ -1205,7 +1211,8 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
 	component_del(&pdev->dev, &sun6i_dsi_ops);
 	mipi_dsi_host_unregister(&dsi->host);
 	pm_runtime_disable(dev);
-	clk_rate_exclusive_put(dsi->mod_clk);
+	if (dsi->variant->has_mod_clk)
+		clk_rate_exclusive_put(dsi->mod_clk);
 
 	return 0;
 }
@@ -1222,7 +1229,8 @@ static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
 	}
 
 	reset_control_deassert(dsi->reset);
-	clk_prepare_enable(dsi->mod_clk);
+	if (dsi->variant->has_mod_clk)
+		clk_prepare_enable(dsi->mod_clk);
 
 	/*
 	 * Enable the DSI block.
@@ -1250,7 +1258,8 @@ static int __maybe_unused sun6i_dsi_runtime_suspend(struct device *dev)
 {
 	struct sun6i_dsi *dsi = dev_get_drvdata(dev);
 
-	clk_disable_unprepare(dsi->mod_clk);
+	if (dsi->variant->has_mod_clk)
+		clk_disable_unprepare(dsi->mod_clk);
 	reset_control_assert(dsi->reset);
 	regulator_disable(dsi->regulator);
 
@@ -1263,9 +1272,16 @@ static const struct dev_pm_ops sun6i_dsi_pm_ops = {
 			   NULL)
 };
 
+static const struct sun6i_dsi_variant sun6i_a31_mipi_dsi = {
+	.has_mod_clk = true,
+};
+
 static const struct of_device_id sun6i_dsi_of_table[] = {
-	{ .compatible = "allwinner,sun6i-a31-mipi-dsi" },
-	{ }
+	{
+		.compatible = "allwinner,sun6i-a31-mipi-dsi",
+		.data = &sun6i_a31_mipi_dsi,
+	},
+	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
 
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
index c570f2b3868f..5c4983212f89 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -15,6 +15,10 @@
 
 #include <linux/regulator/consumer.h>
 
+struct sun6i_dsi_variant {
+	bool			has_mod_clk;
+};
+
 struct sun6i_dsi {
 	struct drm_connector	connector;
 	struct drm_encoder	encoder;
@@ -32,6 +36,7 @@ struct sun6i_dsi {
 	struct sun4i_tcon	*tcon;
 	struct mipi_dsi_device	*device;
 	struct drm_panel	*panel;
+	const struct sun6i_dsi_variant	*variant;
 };
 
 static inline struct sun6i_dsi *host_to_sun6i_dsi(struct mipi_dsi_host *host)
-- 
2.18.0.321.gffc6fa0e3