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Subject[PATCH 02/12] drm/sun4i: sun6i_mipi_dsi: Add Allwinner A64 MIPI DSI support
Date
The MIPI DSI controller on Allwinner A64 is similar to
Allwinner A31 without support of DSI mod clock(CLK_DSI_SCLK)

So, alter has_mod_clk bool via driver data for respective
SoC's compatible.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 47 ++++++++++++++++++++------
drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 5 +++
2 files changed, 41 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index e3b34a345546..8e9c76febca2 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>
@@ -981,6 +982,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
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);
if (IS_ERR(base)) {
@@ -1001,17 +1004,20 @@ 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);

dphy_node = of_parse_phandle(dev->of_node, "phys", 0);
ret = sun6i_dphy_probe(dsi, dphy_node);
@@ -1043,7 +1049,8 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
pm_runtime_disable(dev);
sun6i_dphy_remove(dsi);
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;
}

@@ -1056,7 +1063,8 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
mipi_dsi_host_unregister(&dsi->host);
pm_runtime_disable(dev);
sun6i_dphy_remove(dsi);
- clk_rate_exclusive_put(dsi->mod_clk);
+ if (dsi->variant->has_mod_clk)
+ clk_rate_exclusive_put(dsi->mod_clk);

return 0;
}
@@ -1066,7 +1074,8 @@ static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
struct sun6i_dsi *dsi = dev_get_drvdata(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.
@@ -1094,7 +1103,8 @@ 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);

return 0;
@@ -1106,9 +1116,24 @@ static const struct dev_pm_ops sun6i_dsi_pm_ops = {
NULL)
};

+static const struct sun6i_dsi_variant sun6i_a31_dsi = {
+ .has_mod_clk = true,
+};
+
+static const struct sun6i_dsi_variant sun50i_a64_dsi = {
+ .has_mod_clk = false,
+};
+
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_dsi,
+ },
+ {
+ .compatible = "allwinner,sun50i-a64-mipi-dsi",
+ .data = &sun50i_a64_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 dbbc5b3ecbda..597b62227019 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -20,6 +20,10 @@ struct sun6i_dphy {
struct reset_control *reset;
};

+struct sun6i_dsi_variant {
+ bool has_mod_clk;
+};
+
struct sun6i_dsi {
struct drm_connector connector;
struct drm_encoder encoder;
@@ -35,6 +39,7 @@ struct sun6i_dsi {
struct sun4i_drv *drv;
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
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