From e12f9be2893bb1c931cbdd79c2482ae4cfe547cb Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Wed, 16 Jun 2021 13:08:00 +0100
Subject: [PATCH 0450/1085] media: i2c: imx258: Add support for 24MHz clock

There's no reason why the clock must be 19.2MHz and nothing
else (indeed this isn't even a frequency listed in the datasheet),
so add support for 24MHz as well.
The PLL settings result in slightly different link frequencies,
so parameterise those.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/imx258.c | 141 +++++++++++++++++++++++++++++--------
 1 file changed, 111 insertions(+), 30 deletions(-)

--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -76,9 +76,6 @@
 #define REG_CONFIG_MIRROR_FLIP		0x03
 #define REG_CONFIG_FLIP_TEST_PATTERN	0x02
 
-/* Input clock frequency in Hz */
-#define IMX258_INPUT_CLOCK_FREQ		19200000
-
 struct imx258_reg {
 	u16 address;
 	u8 val;
@@ -91,6 +88,7 @@ struct imx258_reg_list {
 
 /* Link frequency config */
 struct imx258_link_freq_config {
+	u64 link_frequency;
 	u32 pixels_per_line;
 
 	/* PLL registers for this link frequency */
@@ -115,7 +113,9 @@ struct imx258_mode {
 };
 
 /* 4208x3120 needs 1267Mbps/lane, 4 lanes */
-static const struct imx258_reg mipi_data_rate_1267mbps[] = {
+static const struct imx258_reg mipi_1267mbps_19_2mhz[] = {
+	{ 0x0136, 0x13 },
+	{ 0x0137, 0x33 },
 	{ 0x0301, 0x05 },
 	{ 0x0303, 0x02 },
 	{ 0x0305, 0x03 },
@@ -133,7 +133,29 @@ static const struct imx258_reg mipi_data
 	{ 0x0823, 0xCC },
 };
 
-static const struct imx258_reg mipi_data_rate_640mbps[] = {
+static const struct imx258_reg mipi_1272mbps_24mhz[] = {
+	{ 0x0136, 0x18 },
+	{ 0x0137, 0x00 },
+	{ 0x0301, 0x05 },
+	{ 0x0303, 0x02 },
+	{ 0x0305, 0x04 },
+	{ 0x0306, 0x00 },
+	{ 0x0307, 0xD4 },
+	{ 0x0309, 0x0A },
+	{ 0x030B, 0x01 },
+	{ 0x030D, 0x02 },
+	{ 0x030E, 0x00 },
+	{ 0x030F, 0xD8 },
+	{ 0x0310, 0x00 },
+	{ 0x0820, 0x13 },
+	{ 0x0821, 0x4C },
+	{ 0x0822, 0xCC },
+	{ 0x0823, 0xCC },
+};
+
+static const struct imx258_reg mipi_640mbps_19_2mhz[] = {
+	{ 0x0136, 0x13 },
+	{ 0x0137, 0x33 },
 	{ 0x0301, 0x05 },
 	{ 0x0303, 0x02 },
 	{ 0x0305, 0x03 },
@@ -151,9 +173,27 @@ static const struct imx258_reg mipi_data
 	{ 0x0823, 0x00 },
 };
 
+static const struct imx258_reg mipi_642mbps_24mhz[] = {
+	{ 0x0136, 0x18 },
+	{ 0x0137, 0x00 },
+	{ 0x0301, 0x05 },
+	{ 0x0303, 0x02 },
+	{ 0x0305, 0x04 },
+	{ 0x0306, 0x00 },
+	{ 0x0307, 0x6B },
+	{ 0x0309, 0x0A },
+	{ 0x030B, 0x01 },
+	{ 0x030D, 0x02 },
+	{ 0x030E, 0x00 },
+	{ 0x030F, 0xD8 },
+	{ 0x0310, 0x00 },
+	{ 0x0820, 0x0A },
+	{ 0x0821, 0x00 },
+	{ 0x0822, 0x00 },
+	{ 0x0823, 0x00 },
+};
+
 static const struct imx258_reg mode_4208x3120_regs[] = {
-	{ 0x0136, 0x13 },
-	{ 0x0137, 0x33 },
 	{ 0x3051, 0x00 },
 	{ 0x3052, 0x00 },
 	{ 0x4E21, 0x14 },
@@ -267,8 +307,6 @@ static const struct imx258_reg mode_4208
 };
 
 static const struct imx258_reg mode_2104_1560_regs[] = {
-	{ 0x0136, 0x13 },
-	{ 0x0137, 0x33 },
 	{ 0x3051, 0x00 },
 	{ 0x3052, 0x00 },
 	{ 0x4E21, 0x14 },
@@ -382,8 +420,6 @@ static const struct imx258_reg mode_2104
 };
 
 static const struct imx258_reg mode_1048_780_regs[] = {
-	{ 0x0136, 0x13 },
-	{ 0x0137, 0x33 },
 	{ 0x3051, 0x00 },
 	{ 0x3052, 0x00 },
 	{ 0x4E21, 0x14 },
@@ -514,10 +550,6 @@ static const char * const imx258_supply_
 
 #define IMX258_NUM_SUPPLIES ARRAY_SIZE(imx258_supply_name)
 
-/* Configurations for supported link frequencies */
-#define IMX258_LINK_FREQ_634MHZ	633600000ULL
-#define IMX258_LINK_FREQ_320MHZ	320000000ULL
-
 enum {
 	IMX258_LINK_FREQ_1267MBPS,
 	IMX258_LINK_FREQ_640MBPS,
@@ -536,25 +568,55 @@ static u64 link_freq_to_pixel_rate(u64 f
 }
 
 /* Menu items for LINK_FREQ V4L2 control */
-static const s64 link_freq_menu_items[] = {
+/* Configurations for supported link frequencies */
+#define IMX258_LINK_FREQ_634MHZ	633600000ULL
+#define IMX258_LINK_FREQ_320MHZ	320000000ULL
+
+static const s64 link_freq_menu_items_19_2[] = {
 	IMX258_LINK_FREQ_634MHZ,
 	IMX258_LINK_FREQ_320MHZ,
 };
 
+/* Configurations for supported link frequencies */
+#define IMX258_LINK_FREQ_636MHZ	636000000ULL
+#define IMX258_LINK_FREQ_321MHZ	321000000ULL
+
+static const s64 link_freq_menu_items_24[] = {
+	IMX258_LINK_FREQ_636MHZ,
+	IMX258_LINK_FREQ_321MHZ,
+};
+
 /* Link frequency configs */
-static const struct imx258_link_freq_config link_freq_configs[] = {
+static const struct imx258_link_freq_config link_freq_configs_19_2[] = {
+	[IMX258_LINK_FREQ_1267MBPS] = {
+		.pixels_per_line = IMX258_PPL_DEFAULT,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mipi_1267mbps_19_2mhz),
+			.regs = mipi_1267mbps_19_2mhz,
+		}
+	},
+	[IMX258_LINK_FREQ_640MBPS] = {
+		.pixels_per_line = IMX258_PPL_DEFAULT,
+		.reg_list = {
+			.num_of_regs = ARRAY_SIZE(mipi_640mbps_19_2mhz),
+			.regs = mipi_640mbps_19_2mhz,
+		}
+	},
+};
+
+static const struct imx258_link_freq_config link_freq_configs_24[] = {
 	[IMX258_LINK_FREQ_1267MBPS] = {
 		.pixels_per_line = IMX258_PPL_DEFAULT,
 		.reg_list = {
-			.num_of_regs = ARRAY_SIZE(mipi_data_rate_1267mbps),
-			.regs = mipi_data_rate_1267mbps,
+			.num_of_regs = ARRAY_SIZE(mipi_1272mbps_24mhz),
+			.regs = mipi_1272mbps_24mhz,
 		}
 	},
 	[IMX258_LINK_FREQ_640MBPS] = {
 		.pixels_per_line = IMX258_PPL_DEFAULT,
 		.reg_list = {
-			.num_of_regs = ARRAY_SIZE(mipi_data_rate_640mbps),
-			.regs = mipi_data_rate_640mbps,
+			.num_of_regs = ARRAY_SIZE(mipi_642mbps_24mhz),
+			.regs = mipi_642mbps_24mhz,
 		}
 	},
 };
@@ -611,6 +673,9 @@ struct imx258 {
 	/* Current mode */
 	const struct imx258_mode *cur_mode;
 
+	const struct imx258_link_freq_config *link_freq_configs;
+	const s64 *link_freq_menu_items;
+
 	/*
 	 * Mutex for serialized access:
 	 * Protect sensor module set pad format and start/stop streaming safely.
@@ -918,7 +983,7 @@ static int imx258_set_pad_format(struct
 		imx258->cur_mode = mode;
 		__v4l2_ctrl_s_ctrl(imx258->link_freq, mode->link_freq_index);
 
-		link_freq = link_freq_menu_items[mode->link_freq_index];
+		link_freq = imx258->link_freq_menu_items[mode->link_freq_index];
 		pixel_rate = link_freq_to_pixel_rate(link_freq);
 		__v4l2_ctrl_s_ctrl_int64(imx258->pixel_rate, pixel_rate);
 		/* Update limits and set FPS to default */
@@ -932,7 +997,7 @@ static int imx258_set_pad_format(struct
 			vblank_def);
 		__v4l2_ctrl_s_ctrl(imx258->vblank, vblank_def);
 		h_blank =
-			link_freq_configs[mode->link_freq_index].pixels_per_line
+			imx258->link_freq_configs[mode->link_freq_index].pixels_per_line
 			 - imx258->cur_mode->width;
 		__v4l2_ctrl_modify_range(imx258->hblank, h_blank,
 					 h_blank, 1, h_blank);
@@ -952,7 +1017,7 @@ static int imx258_start_streaming(struct
 
 	/* Setup PLL */
 	link_freq_index = imx258->cur_mode->link_freq_index;
-	reg_list = &link_freq_configs[link_freq_index].reg_list;
+	reg_list = &imx258->link_freq_configs[link_freq_index].reg_list;
 	ret = imx258_write_regs(imx258, reg_list->regs, reg_list->num_of_regs);
 	if (ret) {
 		dev_err(&client->dev, "%s failed to set plls\n", __func__);
@@ -1180,9 +1245,9 @@ static int imx258_init_controls(struct i
 	imx258->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr,
 				&imx258_ctrl_ops,
 				V4L2_CID_LINK_FREQ,
-				ARRAY_SIZE(link_freq_menu_items) - 1,
+				ARRAY_SIZE(link_freq_menu_items_19_2) - 1,
 				0,
-				link_freq_menu_items);
+				imx258->link_freq_menu_items);
 
 	if (imx258->link_freq)
 		imx258->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
@@ -1198,8 +1263,10 @@ static int imx258_init_controls(struct i
 	if (vflip)
 		vflip->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 
-	pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
-	pixel_rate_min = link_freq_to_pixel_rate(link_freq_menu_items[1]);
+	pixel_rate_max =
+		link_freq_to_pixel_rate(imx258->link_freq_menu_items[0]);
+	pixel_rate_min =
+		link_freq_to_pixel_rate(imx258->link_freq_menu_items[1]);
 	/* By default, PIXEL_RATE is read only */
 	imx258->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx258_ctrl_ops,
 				V4L2_CID_PIXEL_RATE,
@@ -1317,11 +1384,25 @@ static int imx258_probe(struct i2c_clien
 			"no clock provided, using clock-frequency property\n");
 
 		device_property_read_u32(&client->dev, "clock-frequency", &val);
+	} else if (IS_ERR(imx258->clk)) {
+		return dev_err_probe(&client->dev, PTR_ERR(imx258->clk),
+				     "error getting clock\n");
 	} else {
 		val = clk_get_rate(imx258->clk);
 	}
-	if (val != IMX258_INPUT_CLOCK_FREQ) {
-		dev_err(&client->dev, "input clock frequency not supported\n");
+
+	switch (val) {
+	case 19200000:
+		imx258->link_freq_configs = link_freq_configs_19_2;
+		imx258->link_freq_menu_items = link_freq_menu_items_19_2;
+		break;
+	case 24000000:
+		imx258->link_freq_configs = link_freq_configs_24;
+		imx258->link_freq_menu_items = link_freq_menu_items_24;
+		break;
+	default:
+		dev_err(&client->dev, "input clock frequency of %u not supported\n",
+			val);
 		return -EINVAL;
 	}
 
