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Message-Id: <1417433164-13067-1-git-send-email-andy.yan@rock-chips.com>
Date: Mon, 1 Dec 2014 19:26:04 +0800
From: Andy Yan <andy.yan@...k-chips.com>
To: airlied@...ux.ie, Philipp Zabel <p.zabel@...gutronix.de>,
heiko@...ech.de, fabio.estevam@...escale.com,
rmk+kernel@....linux.org.uk
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Shawn Guo <shawn.guo@...aro.org>,
Josh Boyer <jwboyer@...hat.com>,
Sean Paul <seanpaul@...omium.org>,
Inki Dae <inki.dae@...sung.com>,
Dave Airlie <airlied@...hat.com>,
Arnd Bergmann <arnd@...db.de>,
Lucas Stach <l.stach@...gutronix.de>,
Zubair.Kakakhel@...tec.com, djkurtz@...gle.com, ykk@...k-chips.com,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
linux-rockchip@...ts.infradead.org, jay.xu@...k-chips.com,
Pawel Moll <pawel.moll@....com>, mark.yao@...k-chips.com,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Andy Yan <andy.yan@...k-chips.com>
Subject: [PATCH v14 07/12] 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@...k-chips.com>
---
Changes in v14: None
Changes in v13: None
Changes in v12: None
Changes in v11: None
Changes in v10: None
Changes in v9: None
Changes in v8: None
Changes in v7: None
Changes in v6:
- refactor register access without reg_shift
Changes in v5:
- refactor reg-io-width
Changes in v4: None
Changes in v3:
- split multi-register access to one indepent patch
drivers/gpu/drm/bridge/dw_hdmi.c | 57 +++++++++++++++++++++++++++++++++++-----
1 file changed, 51 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c
index a53bf63..5e88c8d 100644
--- a/drivers/gpu/drm/bridge/dw_hdmi.c
+++ b/drivers/gpu/drm/bridge/dw_hdmi.c
@@ -100,6 +100,11 @@ struct hdmi_data_info {
struct hdmi_vmode video_mode;
};
+union dw_reg_ptr {
+ u32 __iomem *p32;
+ u8 __iomem *p8;
+};
+
struct dw_hdmi {
struct drm_connector connector;
struct drm_encoder *encoder;
@@ -121,20 +126,43 @@ struct dw_hdmi {
struct regmap *regmap;
struct i2c_adapter *ddc;
- void __iomem *regs;
+ union dw_reg_ptr regs;
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 void dw_hdmi_writel(struct dw_hdmi *hdmi, u8 val, int offset)
+{
+ writel(val, hdmi->regs.p32 + offset);
+}
+
+static u8 dw_hdmi_readl(struct dw_hdmi *hdmi, int offset)
+{
+ return readl(hdmi->regs.p32 + offset);
+}
+
+static void dw_hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
+{
+ writeb(val, hdmi->regs.p8 + offset);
+}
+
+static u8 dw_hdmi_readb(struct dw_hdmi *hdmi, int offset)
+{
+ return readb(hdmi->regs.p8 + offset);
+}
+
static inline void hdmi_writeb(struct dw_hdmi *hdmi, u8 val, int offset)
{
- writeb(val, hdmi->regs + offset);
+ hdmi->write(hdmi, val, offset);
}
static inline u8 hdmi_readb(struct dw_hdmi *hdmi, int offset)
{
- return readb(hdmi->regs + offset);
+ return hdmi->read(hdmi, offset);
}
static void hdmi_modb(struct dw_hdmi *hdmi, u8 data, u8 mask, unsigned reg)
@@ -1508,6 +1536,7 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
struct dw_hdmi *hdmi;
struct resource *iores;
int ret, irq;
+ u32 val = 1;
hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
if (!hdmi)
@@ -1520,6 +1549,22 @@ 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);
@@ -1544,9 +1589,9 @@ int dw_hdmi_bind(struct device *dev, struct device *master,
return ret;
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- hdmi->regs = devm_ioremap_resource(dev, iores);
- if (IS_ERR(hdmi->regs))
- return PTR_ERR(hdmi->regs);
+ hdmi->regs.p32 = devm_ioremap_resource(dev, iores);
+ if (IS_ERR(hdmi->regs.p32))
+ return PTR_ERR(hdmi->regs.p32);
/* Product and revision IDs */
dev_info(dev,
--
1.9.1
--
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