[PATCH v2 39/43] drm/sun4i: frontend: Add a quirk structure

Paul Kocialkowski
2018-11-23T09:27:38Z

From: Maxime Ripard <maxime.ripard@bootlin.com>

The ACCESS_CTRL bit is not found on all the variants of the frontend, so
let's introduce a structure that will hold whether or not we need to set
it, and associate it with the compatible.

This will be extended for further similar quirks later on.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
drivers/gpu/drm/sun4i/sun4i_frontend.c | 21 +++++++++++++++++----
drivers/gpu/drm/sun4i/sun4i_frontend.h | 6 ++++++
2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c b/drivers/gpu/drm/sun4i/sun4i_frontend.c
index 2c9dcb4ffde0..368391a9e5fd 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
@@ -10,6 +10,7 @@
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
@@ -74,9 +75,10 @@ static void sun4i_frontend_scaler_init(struct sun4i_frontend *frontend)
{
int i;

- regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
- SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL,
- SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL);
+ if (frontend->data->has_coef_access_ctrl)
+ regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
+ SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL,
+ SUN4I_FRONTEND_FRM_CTRL_COEF_ACCESS_CTRL);

for (i = 0; i < 32; i++) {
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZCOEF0_REG(i),
@@ -547,6 +549,10 @@ static int sun4i_frontend_bind(struct device *dev, struct device *master,
frontend->dev = dev;
frontend->node = dev->of_node;

+ frontend->data = of_device_get_match_data(dev);
+ if (!frontend->data)
+ return -ENODEV;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(dev, res);
if (IS_ERR(regs))
@@ -659,8 +665,15 @@ static const struct dev_pm_ops sun4i_frontend_pm_ops = {
.runtime_suspend = sun4i_frontend_runtime_suspend,
};

+static const struct sun4i_frontend_data sun8i_a33_frontend = {
+ .has_coef_access_ctrl = true,
+};
+
const struct of_device_id sun4i_frontend_of_table[] = {
- { .compatible = "allwinner,sun8i-a33-display-frontend" },
+ {
+ .compatible = "allwinner,sun8i-a33-display-frontend",
+ .data = &sun8i_a33_frontend
+ },
{ }
};
EXPORT_SYMBOL(sun4i_frontend_of_table);
diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.h b/drivers/gpu/drm/sun4i/sun4i_frontend.h
index 822d39ca4b8e..daf3fa5d01ba 100644
--- a/drivers/gpu/drm/sun4i/sun4i_frontend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_frontend.h
@@ -100,6 +100,10 @@ struct drm_plane;
struct regmap;
struct reset_control;

+struct sun4i_frontend_data {
+ bool has_coef_access_ctrl;
+};
+
struct sun4i_frontend {
struct list_head list;
struct device *dev;
@@ -110,6 +114,8 @@ struct sun4i_frontend {
struct clk *ram_clk;
struct regmap *regs;
struct reset_control *reset;
+
+ const struct sun4i_frontend_data *data;
};

extern const struct of_device_id sun4i_frontend_of_table[];
--
2.19.1