media: ti-vpe: cal: Don't store external rate in cal_camerarx

The external pixel rate is retrieved when starting the camerarx and only
used then. There's no need to store it in the cal_camerarx structure, it
can be returned by cal_camerarx_get_external_info() and explicitly
passed to cal_camerarx_config().

While at it, rename cal_camerarx_get_external_info() to
cal_camerarx_get_external_rate() to better reflect the function's
purpose.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/ti-vpe/cal.c

@@ -272,7 +272,6 @@ struct cal_camerarx {
 	struct v4l2_fwnode_endpoint	endpoint;
 	struct device_node	*sensor_node;
 	struct v4l2_subdev	*sensor;
-	unsigned int		external_rate;
 };
 
 struct cal_dev {
@@ -481,9 +480,10 @@ static void cal_quickdump_regs(struct cal_dev *cal)
  * ------------------------------------------------------------------
  */
 
-static int cal_camerarx_get_external_info(struct cal_camerarx *phy)
+static s64 cal_camerarx_get_external_rate(struct cal_camerarx *phy)
 {
 	struct v4l2_ctrl *ctrl;
+	s64 rate;
 
 	if (!phy->sensor)
 		return -ENODEV;
@@ -495,10 +495,10 @@ static int cal_camerarx_get_external_info(struct cal_camerarx *phy)
 		return -EPIPE;
 	}
 
-	phy->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
-	phy_dbg(3, phy, "sensor Pixel Rate: %u\n", phy->external_rate);
+	rate = v4l2_ctrl_g_ctrl_int64(ctrl);
+	phy_dbg(3, phy, "sensor Pixel Rate: %llu\n", rate);
 
-	return 0;
+	return rate;
 }
 
 static void cal_camerarx_lane_config(struct cal_camerarx *phy)
@@ -554,7 +554,7 @@ static void cal_camerarx_disable(struct cal_camerarx *phy)
 #define TCLK_MISS	1
 #define TCLK_SETTLE	14
 
-static void cal_camerarx_config(struct cal_camerarx *phy,
+static void cal_camerarx_config(struct cal_camerarx *phy, s64 external_rate,
 				const struct cal_fmt *fmt)
 {
 	unsigned int reg0, reg1;
@@ -565,9 +565,16 @@ static void cal_camerarx_config(struct cal_camerarx *phy,
 	u32 num_lanes = mipi_csi2->num_data_lanes;
 
 	/* DPHY timing configuration */
-	/* CSI-2 is DDR and we only count used lanes. */
-	csi2_ddrclk_khz = phy->external_rate / 1000
-		/ (2 * num_lanes) * fmt->bpp;
+
+	/*
+	 * CSI-2 is DDR and we only count used lanes.
+	 *
+	 * csi2_ddrclk_khz = external_rate / 1000
+	 *		   / (2 * num_lanes) * fmt->bpp;
+	 */
+	csi2_ddrclk_khz = div_s64(external_rate * fmt->bpp,
+				  2 * num_lanes * 1000);
+
 	phy_dbg(1, phy, "csi2_ddrclk_khz: %d\n", csi2_ddrclk_khz);
 
 	/* THS_TERM: Programmed value = floor(20 ns/DDRClk period) */
@@ -667,13 +674,14 @@ static void cal_camerarx_wait_stop_state(struct cal_camerarx *phy)
 static int cal_camerarx_start(struct cal_camerarx *phy,
 			      const struct cal_fmt *fmt)
 {
+	s64 external_rate;
 	u32 sscounter;
 	u32 val;
 	int ret;
 
-	ret = cal_camerarx_get_external_info(phy);
-	if (ret < 0)
-		return ret;
+	external_rate = cal_camerarx_get_external_rate(phy);
+	if (external_rate < 0)
+		return external_rate;
 
 	ret = v4l2_subdev_call(phy->sensor, core, s_power, 1);
 	if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV) {
@@ -719,7 +727,7 @@ static int cal_camerarx_start(struct cal_camerarx *phy,
 	reg_read(phy, CAL_CSI2_PHY_REG0);
 
 	/* Program the PHY timing parameters. */
-	cal_camerarx_config(phy, fmt);
+	cal_camerarx_config(phy, external_rate, fmt);
 
 	/*
 	 *    b. Assert the FORCERXMODE signal.
@@ -1039,7 +1047,6 @@ static struct cal_camerarx *cal_camerarx_create(struct cal_dev *cal,
 
 	phy->cal = cal;
 	phy->instance = instance;
-	phy->external_rate = 192000000;
 
 	phy->res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 						(instance == 0) ?