drm/v3d: Switch clock setting to new api

Signed-off-by: Dom Cobley <popcornmix@gmail.com>

drm/v3d: Convert to new clock range API

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

drivers/gpu/drm/v3d/v3d_drv.c

@@ -17,13 +17,17 @@
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/sched/clock.h>
 #include <linux/reset.h>
 
 #include <drm/drm_drv.h>
 #include <drm/drm_managed.h>
+
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
 #include <uapi/drm/v3d_drm.h>
 
 #include "v3d_drv.h"
@@ -263,6 +267,8 @@ map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 static int v3d_platform_drm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct rpi_firmware *firmware;
+	struct device_node *node;
 	struct drm_device *drm;
 	struct v3d_dev *v3d;
 	int ret;
@@ -327,7 +333,20 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 			dev_err(dev, "Failed to get clock (%ld)\n", PTR_ERR(v3d->clk));
 		return PTR_ERR(v3d->clk);
 	}
-	v3d->clk_up_rate = clk_get_rate(v3d->clk);
+
+	node = rpi_firmware_find_node();
+	if (!node)
+		return -EINVAL;
+
+	firmware = rpi_firmware_get(node);
+	of_node_put(node);
+	if (!firmware)
+		return -EPROBE_DEFER;
+
+	v3d->clk_up_rate = rpi_firmware_clk_get_max_rate(firmware,
+							 RPI_FIRMWARE_V3D_CLK_ID);
+	rpi_firmware_put(firmware);
+
 	/* For downclocking, drop it to the minimum frequency we can get from
 	 * the CPRMAN clock generator dividing off our parent.  The divider is
 	 * 4 bits, but ask for just higher than that so that rounding doesn't
@@ -364,7 +383,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	ret = v3d_sysfs_init(dev);
 	if (ret)
 		goto drm_unregister;
-	ret = clk_set_rate(v3d->clk, v3d->clk_down_rate);
+	ret = clk_set_min_rate(v3d->clk, v3d->clk_down_rate);
 	WARN_ON_ONCE(ret != 0);
 
 	return 0;