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From:   Umang Jain <umang.jain@ideasonboard.com>
To:     devicetree@vger.kernel.org, linux-media@vger.kernel.org
Cc:     "Paul J . Murphy" <paul.j.murphy@intel.com>,
        Daniele Alessandrelli <daniele.alessandrelli@intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Umang Jain <umang.jain@ideasonboard.com>,
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v3 8/8] media: i2c: imx335: Support multiple link frequency
Date:   Fri,  8 Dec 2023 20:37:54 +0530
Message-ID: <20231208150756.124720-9-umang.jain@ideasonboard.com>
In-Reply-To: <20231208150756.124720-1-umang.jain@ideasonboard.com>
References: <20231208150756.124720-1-umang.jain@ideasonboard.com>
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Support link frequency of 445MHz in addition to 594MHz.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
---
 drivers/media/i2c/imx335.c | 89 +++++++++++++++++++++++++++++---------
 1 file changed, 68 insertions(+), 21 deletions(-)

diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
index 76a05624ca94..1d6dc38e3e6b 100644
--- a/drivers/media/i2c/imx335.c
+++ b/drivers/media/i2c/imx335.c
@@ -49,7 +49,8 @@
 #define IMX335_INCLK_RATE	24000000
 
 /* CSI2 HW configuration */
-#define IMX335_LINK_FREQ	594000000
+#define IMX335_LINK_FREQ_594MHz	594000000
+#define IMX335_LINK_FREQ_445MHz	445500000
 #define IMX335_NUM_DATA_LANES	4
 
 #define IMX335_REG_MIN		0x00
@@ -99,7 +100,6 @@ 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 +111,6 @@ struct imx335_mode {
 	u32 vblank_min;
 	u32 vblank_max;
 	u64 pclk;
-	u32 link_freq_idx;
 	struct imx335_reg_list reg_list;
 };
 
@@ -133,6 +132,7 @@ struct imx335_mode {
  * @again_ctrl: Pointer to analog gain control
  * @vblank: Vertical blanking in lines
  * @cur_mode: Pointer to current selected sensor mode
+ * @link_freq_idx: Selected link frequency index
  * @mutex: Mutex for serializing sensor controls
  */
 struct imx335 {
@@ -155,20 +155,16 @@ struct imx335 {
 	};
 	u32 vblank;
 	const struct imx335_mode *cur_mode;
+	u32 link_freq_idx;
 	struct mutex mutex;
 	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},
@@ -176,10 +172,6 @@ static const struct imx335_reg mode_2592x1940_regs[] = {
 	{0x3074, 0xc8},
 	{0x3076, 0x28},
 	{0x304c, 0x00},
-	{0x314c, 0xc6},
-	{0x315a, 0x02},
-	{0x3168, 0xa0},
-	{0x316a, 0x7e},
 	{0x31a1, 0x00},
 	{0x3288, 0x21},
 	{0x328a, 0x02},
@@ -265,6 +257,46 @@ 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},
+};
+
+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},
+};
+
+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,
@@ -279,7 +311,6 @@ 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,
@@ -404,7 +435,7 @@ static int imx335_update_controls(struct imx335 *imx335,
 {
 	int ret;
 
-	ret = __v4l2_ctrl_s_ctrl(imx335->link_freq_ctrl, mode->link_freq_idx);
+	ret = __v4l2_ctrl_s_ctrl(imx335->link_freq_ctrl, imx335->link_freq_idx);
 	if (ret)
 		return ret;
 
@@ -754,6 +785,14 @@ static int imx335_start_streaming(struct imx335 *imx335)
 	const struct imx335_reg_list *reg_list;
 	int ret;
 
+	/* Setup PLL */
+	reg_list = &link_freq_reglist[imx335->link_freq_idx];
+	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,
@@ -880,7 +919,7 @@ static int imx335_parse_hw_config(struct imx335 *imx335)
 	};
 	struct fwnode_handle *ep;
 	unsigned long rate;
-	unsigned int i;
+	unsigned int i, j;
 	int ret;
 
 	if (!fwnode)
@@ -944,13 +983,21 @@ static int imx335_parse_hw_config(struct imx335 *imx335)
 		goto done_endpoint_free;
 	}
 
-	for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
-		if (bus_cfg.link_frequencies[i] == IMX335_LINK_FREQ)
-			goto done_endpoint_free;
 
-	dev_err(imx335->dev, "no compatible link frequencies found\n");
+	for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++) {
+		for (j = 0; j < ARRAY_SIZE(link_freq); j++) {
+			if (bus_cfg.link_frequencies[i] == link_freq[j]) {
+				imx335->link_freq_idx = j;
+				break;
+			}
+		}
 
-	ret = -EINVAL;
+		if (j == ARRAY_SIZE(link_freq)) {
+			ret = dev_err_probe(imx335->dev, -EINVAL,
+					    "no supported link freq found\n");
+			goto done_endpoint_free;
+		}
+	}
 
 done_endpoint_free:
 	v4l2_fwnode_endpoint_free(&bus_cfg);
@@ -1097,7 +1144,7 @@ static int imx335_init_controls(struct imx335 *imx335)
 							V4L2_CID_LINK_FREQ,
 							ARRAY_SIZE(link_freq) -
 							1,
-							mode->link_freq_idx,
+							imx335->link_freq_idx,
 							link_freq);
 	if (imx335->link_freq_ctrl)
 		imx335->link_freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
-- 
2.41.0