drivers/gpu/drm/bridge/inno-hdmi.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/bridge/inno-hdmi.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/bridge/inno-hdmi.c
Extension
.c
Size
31008 bytes
Lines
1142
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct inno_hdmi_i2c {
	struct i2c_adapter adap;

	u8 ddc_addr;
	u8 segment_addr;

	struct mutex lock;
	struct completion cmp;
};

struct inno_hdmi {
	struct device *dev;
	struct drm_bridge bridge;
	struct clk *pclk;
	struct clk *refclk;
	void __iomem *regs;
	struct regmap *grf;

	struct inno_hdmi_i2c *i2c;
	struct i2c_adapter *ddc;
	const struct inno_hdmi_plat_data *plat_data;
};

enum {
	CSC_RGB_0_255_TO_ITU601_16_235_8BIT,
	CSC_RGB_0_255_TO_ITU709_16_235_8BIT,
	CSC_RGB_0_255_TO_RGB_16_235_8BIT,
};

static const char coeff_csc[][24] = {
	/*
	 * RGB2YUV:601 SD mode:
	 *   Cb = -0.291G - 0.148R + 0.439B + 128
	 *   Y  = 0.504G  + 0.257R + 0.098B + 16
	 *   Cr = -0.368G + 0.439R - 0.071B + 128
	 */
	{
		0x11, 0x5f, 0x01, 0x82, 0x10, 0x23, 0x00, 0x80,
		0x02, 0x1c, 0x00, 0xa1, 0x00, 0x36, 0x00, 0x1e,
		0x11, 0x29, 0x10, 0x59, 0x01, 0x82, 0x00, 0x80
	},
	/*
	 * RGB2YUV:709 HD mode:
	 *   Cb = - 0.338G - 0.101R + 0.439B + 128
	 *   Y  = 0.614G   + 0.183R + 0.062B + 16
	 *   Cr = - 0.399G + 0.439R - 0.040B + 128
	 */
	{
		0x11, 0x98, 0x01, 0xc1, 0x10, 0x28, 0x00, 0x80,
		0x02, 0x74, 0x00, 0xbb, 0x00, 0x3f, 0x00, 0x10,
		0x11, 0x5a, 0x10, 0x67, 0x01, 0xc1, 0x00, 0x80
	},
	/*
	 * RGB[0:255]2RGB[16:235]:
	 *   R' = R x (235-16)/255 + 16;
	 *   G' = G x (235-16)/255 + 16;
	 *   B' = B x (235-16)/255 + 16;
	 */
	{
		0x00, 0x00, 0x03, 0x6F, 0x00, 0x00, 0x00, 0x10,
		0x03, 0x6F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
		0x00, 0x00, 0x00, 0x00, 0x03, 0x6F, 0x00, 0x10
	},
};

static struct inno_hdmi *bridge_to_inno_hdmi(struct drm_bridge *bridge)
{
	return container_of(bridge, struct inno_hdmi, bridge);
}

static int inno_hdmi_find_phy_config(struct inno_hdmi *hdmi,
				     unsigned long pixelclk)
{
	const struct inno_hdmi_phy_config *phy_configs = hdmi->plat_data->phy_configs;
	int i;

	for (i = 0; phy_configs[i].pixelclock != ~0UL; i++) {
		if (pixelclk <= phy_configs[i].pixelclock)
			return i;
	}

	DRM_DEV_DEBUG(hdmi->dev, "No phy configuration for pixelclock %lu\n",
		      pixelclk);

	return -EINVAL;
}

static inline u8 hdmi_readb(struct inno_hdmi *hdmi, u16 offset)
{
	return readl_relaxed(hdmi->regs + (offset) * 0x04);

Annotation

Implementation Notes