[PATCH v3 17/20] media: imx355: Compute link frequency from PLL setup

[Dave Stevenson <dave.stevenson@raspberrypi.com>]

In preparation for additional options in the PLL setup, compute
the link frequency rather than using a hardcoded value.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/imx355.c | 39 +++++++++++++++++----------------------
 1 file changed, 17 insertions(+), 22 deletions(-)

diff --git a/drivers/media/i2c/imx355.c b/drivers/media/i2c/imx355.c
index 6a779d700a4b..e45d60d665a1 100644
--- a/drivers/media/i2c/imx355.c
+++ b/drivers/media/i2c/imx355.c
@@ -29,7 +29,11 @@
 
 /* PLL registers that depend on the external clock frequency */
 #define IMX355_REG_EXTCLK_FREQ		CCI_REG16(0x0136)
+#define IMX355_REG_PLL_OP_PREDIV	CCI_REG8(0x030d)
 #define IMX355_REG_PLL_OP_MUL		CCI_REG16(0x030e)
+#define IMX355_REG_PLL_IVT_PCK_DIV	CCI_REG8(0x0301)
+#define IMX355_PLL_OP_PREDIV		2
+#define IMX355_PLL_IVT_PCK_DIV		5
 
 /* V_TIMING internal */
 #define IMX355_REG_FLL			CCI_REG16(0x0340)
@@ -83,9 +87,6 @@
 /* Flip Control */
 #define IMX355_REG_ORIENTATION		CCI_REG8(0x0101)
 
-/* default link frequency and external clock */
-#define IMX355_LINK_FREQ_DEFAULT	360000000LL
-
 /* number of data lanes */
 #define IMX355_DATA_LANES		4
 
@@ -141,6 +142,7 @@ static const struct imx355_clk_params imx355_clk_params[] = {
 };
 
 struct imx355_hwcfg {
+	s64 link_freq_menu;
 	unsigned long link_freq_bitmap;
 };
 
@@ -238,13 +240,13 @@ static const struct cci_reg_sequence imx355_global_regs[] = {
 	{ CCI_REG8(0x0112), 0x0a },
 	{ CCI_REG8(0x0113), 0x0a },
 	{ CCI_REG8(0x0114), 0x03 },
-	{ CCI_REG8(0x0301), 0x05 },
+	{ IMX355_REG_PLL_IVT_PCK_DIV, IMX355_PLL_IVT_PCK_DIV },
 	{ CCI_REG8(0x0303), 0x01 },
 	{ CCI_REG8(0x0305), 0x02 },
 	{ CCI_REG8(0x0306), 0x00 },
 	{ CCI_REG8(0x0307), 0x78 },
 	{ CCI_REG8(0x030b), 0x01 },
-	{ CCI_REG8(0x030d), 0x02 },
+	{ IMX355_REG_PLL_OP_PREDIV, IMX355_PLL_OP_PREDIV },
 	{ CCI_REG8(0x0310), 0x00 },
 	{ CCI_REG8(0x0220), 0x00 },
 	{ CCI_REG8(0x0222), 0x01 },
@@ -338,14 +340,6 @@ static const char * const imx355_test_pattern_menu[] = {
 	"Pseudorandom Sequence (PN9)",
 };
 
-/*
- * When adding more than the one below, make sure the disallowed ones will
- * actually be disabled in the LINK_FREQ control.
- */
-static const s64 link_freq_menu_items[] = {
-	IMX355_LINK_FREQ_DEFAULT,
-};
-
 /* Mode configs */
 static const struct imx355_mode supported_modes[] = {
 	{
@@ -1091,7 +1085,6 @@ static int imx355_init_controls(struct imx355 *imx355)
 	s64 hblank;
 	u64 pixel_rate;
 	const struct imx355_mode *mode;
-	u32 max;
 	int ret;
 
 	ctrl_hdlr = &imx355->ctrl_handler;
@@ -1100,15 +1093,14 @@ static int imx355_init_controls(struct imx355 *imx355)
 		return ret;
 
 	ctrl_hdlr->lock = &imx355->mutex;
-	max = ARRAY_SIZE(link_freq_menu_items) - 1;
 	imx355->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr, &imx355_ctrl_ops,
-						   V4L2_CID_LINK_FREQ, max, 0,
-						   link_freq_menu_items);
+						   V4L2_CID_LINK_FREQ, 0, 0,
+						   &imx355->hwcfg->link_freq_menu);
 	if (imx355->link_freq)
 		imx355->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 
 	/* pixel_rate = link_freq * 2 * nr_of_lanes / bits_per_sample */
-	pixel_rate = IMX355_LINK_FREQ_DEFAULT * 2 * 4;
+	pixel_rate = imx355->hwcfg->link_freq_menu * 2 * 4;
 	do_div(pixel_rate, 10);
 	/* By default, PIXEL_RATE is read only */
 	v4l2_ctrl_new_std(ctrl_hdlr, &imx355_ctrl_ops, V4L2_CID_PIXEL_RATE,
@@ -1183,12 +1175,14 @@ static int imx355_init_controls(struct imx355 *imx355)
 	return ret;
 }
 
-static struct imx355_hwcfg *imx355_get_hwcfg(struct device *dev)
+static struct imx355_hwcfg *imx355_get_hwcfg(struct imx355 *imx355)
 {
+	struct device *dev = imx355->dev;
 	struct imx355_hwcfg *cfg;
 	struct v4l2_fwnode_endpoint bus_cfg = {
 		.bus_type = V4L2_MBUS_CSI2_DPHY
 	};
+	const struct imx355_clk_params *clk = imx355->clk_params;
 	struct fwnode_handle *ep;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	int ret;
@@ -1211,10 +1205,11 @@ static struct imx355_hwcfg *imx355_get_hwcfg(struct device *dev)
 	if (bus_cfg.bus.mipi_csi2.num_data_lanes != IMX355_DATA_LANES)
 		goto out_err;
 
+	cfg->link_freq_menu = (clk->ext_clk * clk->pll_op_mpy) /
+			      (IMX355_PLL_OP_PREDIV * 2);
 	ret = v4l2_link_freq_to_bitmap(dev, bus_cfg.link_frequencies,
 				       bus_cfg.nr_of_link_frequencies,
-				       link_freq_menu_items,
-				       ARRAY_SIZE(link_freq_menu_items),
+				       &cfg->link_freq_menu, 1,
 				       &cfg->link_freq_bitmap);
 	if (ret)
 		goto out_err;
@@ -1285,7 +1280,7 @@ static int imx355_probe(struct i2c_client *client)
 	/* Initialize subdev */
 	v4l2_i2c_subdev_init(&imx355->sd, client, &imx355_subdev_ops);
 
-	imx355->hwcfg = imx355_get_hwcfg(imx355->dev);
+	imx355->hwcfg = imx355_get_hwcfg(imx355);
 	if (!imx355->hwcfg) {
 		dev_err(imx355->dev, "failed to get hwcfg");
 		ret = -ENODEV;

-- 
2.34.1