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drm: bridge/dw_hdmi: add support for multi-byte register width access 

On rockchip rk3288, only word(32-bit) accesses are
permitted for hdmi registers.  Byte width accesses (writeb,
readb) generate an imprecise external abort.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Andy Yan 2014-12-05 14:28:24 +08:00 committed by Philipp Zabel
parent cd15239396
commit 0cd9d14283
1 changed files with 42 additions and 2 deletions
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44
drivers/gpu/drm/bridge/dw_hdmi.c
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@ -128,18 +128,41 @@ struct dw_hdmi {
unsigned int sample_rate;
int ratio;
void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
u8 (*read)(struct dw_hdmi *hdmi, int offset);
};
static inline void hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
static void dw_hdmi_writel(struct dw_hdmi *hdmi, u8 val, int offset)
{
writel(val, hdmi->regs + (offset << 2));
}
static u8 dw_hdmi_readl(struct dw_hdmi *hdmi, int offset)
{
return readl(hdmi->regs + (offset << 2));
}
static void dw_hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
{
writeb(val, hdmi->regs + offset);
}
static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
static u8 dw_hdmi_readb(struct dw_hdmi *hdmi, int offset)
{
return readb(hdmi->regs + offset);
}
static inline void hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
{
hdmi->write(hdmi, val, offset);
}
static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
{
return hdmi->read(hdmi, offset);
}
static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg)
{
u8 val = hdmi_readb(hdmi, reg) & ~mask;
@ -1511,6 +1534,7 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
struct device_node *ddc_node;
struct dw_hdmi *hdmi;
int ret;
u32 val = 1;
hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
if (!hdmi)
@ -1523,6 +1547,22 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
hdmi->ratio = 100;
hdmi->encoder = encoder;
of_property_read_u32(np, "reg-io-width", &val);
switch (val) {
case 4:
hdmi->write = dw_hdmi_writel;
hdmi->read = dw_hdmi_readl;
break;
case 1:
hdmi->write = dw_hdmi_writeb;
hdmi->read = dw_hdmi_readb;
break;
default:
dev_err(dev, "reg-io-width must be 1 or 4\n");
return -EINVAL;
}
ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0);
if (ddc_node) {
hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node);