media: imx335: Support multiple link frequency

Support link frequency of 445MHz in addition to 594MHz.
Break out the register set specific to each data lane rate and also add
the general timing register set corresponding to the each data
lane rate.

Signed-off-by: Umang Jain <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

Author: Umang Jain

drivers/media/i2c/imx335.c

@@ -49,7 +49,9 @@
 #define IMX335_INCLK_RATE	24000000
 
 /* CSI2 HW configuration */
-#define IMX335_LINK_FREQ	594000000LL
+#define IMX335_LINK_FREQ_594MHz		594000000LL
+#define IMX335_LINK_FREQ_445MHz		445500000LL
+
 #define IMX335_NUM_DATA_LANES	4
 
 #define IMX335_REG_MIN		0x00
@@ -99,7 +101,6 @@ static const char * const imx335_supply_name[] = {
  * @vblank_min: Minimum vertical blanking in lines
  * @vblank_max: Maximum vertical blanking in lines
  * @pclk: Sensor pixel clock
- * @link_freq_idx: Link frequency index
  * @reg_list: Register list for sensor mode
  */
 struct imx335_mode {
@@ -111,7 +112,6 @@ struct imx335_mode {
 	u32 vblank_min;
 	u32 vblank_max;
 	u64 pclk;
-	u32 link_freq_idx;
 	struct imx335_reg_list reg_list;
 };
 
@@ -162,27 +162,17 @@ struct imx335 {
 	u32 cur_mbus_code;
 };
 
-static const s64 link_freq[] = {
-	IMX335_LINK_FREQ,
-};
-
 /* Sensor mode registers */
 static const struct imx335_reg mode_2592x1940_regs[] = {
 	{0x3000, 0x01},
 	{0x3002, 0x00},
-	{0x300c, 0x3b},
-	{0x300d, 0x2a},
 	{0x3018, 0x04},
 	{0x302c, 0x3c},
 	{0x302e, 0x20},
 	{0x3056, 0x94},
 	{0x3074, 0xc8},
 	{0x3076, 0x28},
 	{0x304c, 0x00},
-	{0x314c, 0xc6},
-	{0x315a, 0x02},
-	{0x3168, 0xa0},
-	{0x316a, 0x7e},
 	{0x31a1, 0x00},
 	{0x3288, 0x21},
 	{0x328a, 0x02},
@@ -268,6 +258,65 @@ static const struct imx335_reg raw12_framefmt_regs[] = {
 	{0x341d, 0x00},
 };
 
+static const struct imx335_reg mipi_data_rate_1188Mbps[] = {
+	{0x300c, 0x3b},
+	{0x300d, 0x2a},
+	{0x314c, 0xc6},
+	{0x314d, 0x00},
+	{0x315a, 0x02},
+	{0x3168, 0xa0},
+	{0x316a, 0x7e},
+	{0x319e, 0x01},
+	{0x3a18, 0x8f},
+	{0x3a1a, 0x4f},
+	{0x3a1c, 0x47},
+	{0x3a1e, 0x37},
+	{0x3a1f, 0x01},
+	{0x3a20, 0x4f},
+	{0x3a22, 0x87},
+	{0x3a24, 0x4f},
+	{0x3a26, 0x7f},
+	{0x3a28, 0x3f},
+};
+
+static const struct imx335_reg mipi_data_rate_891Mbps[] = {
+	{0x300c, 0x3b},
+	{0x300d, 0x2a},
+	{0x314c, 0x29},
+	{0x314d, 0x01},
+	{0x315a, 0x06},
+	{0x3168, 0xa0},
+	{0x316a, 0x7e},
+	{0x319e, 0x02},
+	{0x3a18, 0x7f},
+	{0x3a1a, 0x37},
+	{0x3a1c, 0x37},
+	{0x3a1e, 0xf7},
+	{0x3a20, 0x3f},
+	{0x3a22, 0x6f},
+	{0x3a24, 0x3f},
+	{0x3a26, 0x5f},
+	{0x3a28, 0x2f},
+};
+
+static const s64 link_freq[] = {
+	/* Corresponds to 1188Mbps data lane rate */
+	IMX335_LINK_FREQ_594MHz,
+	/* Corresponds to 891Mbps data lane rate */
+	IMX335_LINK_FREQ_445MHz,
+};
+
+static const struct imx335_reg_list link_freq_reglist[] = {
+	{
+		.num_of_regs = ARRAY_SIZE(mipi_data_rate_1188Mbps),
+		.regs = mipi_data_rate_1188Mbps,
+	},
+	{
+		.num_of_regs = ARRAY_SIZE(mipi_data_rate_891Mbps),
+		.regs = mipi_data_rate_891Mbps,
+	},
+};
+
 static const u32 imx335_mbus_codes[] = {
 	MEDIA_BUS_FMT_SRGGB12_1X12,
 	MEDIA_BUS_FMT_SRGGB10_1X10,
@@ -282,7 +331,6 @@ static const struct imx335_mode supported_mode = {
 	.vblank_min = 2560,
 	.vblank_max = 133060,
 	.pclk = 396000000,
-	.link_freq_idx = 0,
 	.reg_list = {
 		.num_of_regs = ARRAY_SIZE(mode_2592x1940_regs),
 		.regs = mode_2592x1940_regs,
@@ -765,6 +813,14 @@ static int imx335_start_streaming(struct imx335 *imx335)
 	const struct imx335_reg_list *reg_list;
 	int ret;
 
+	/* Setup PLL */
+	reg_list = &link_freq_reglist[__ffs(imx335->link_freq_bitmap)];
+	ret = imx335_write_regs(imx335, reg_list->regs, reg_list->num_of_regs);
+	if (ret) {
+		dev_err(imx335->dev, "%s failed to set plls\n", __func__);
+		return ret;
+	}
+
 	/* Write sensor mode registers */
 	reg_list = &imx335->cur_mode->reg_list;
 	ret = imx335_write_regs(imx335, reg_list->regs,