drm/imagination: Get GPU resources

Acquire clock and register resources, and enable/map as appropriate.

Changes since v8:
- Corrected license identifiers

Changes since v3:
- Remove regulator resource (not used on supported platform)
- Use devm helpers
- Use devm_clk_get_optional() for optional clocks
- Don't prepare clocks on resource acquisition
- Drop pvr_device_clk_core_get_freq() helper
- Drop pvr_device_reg_fini()
- Drop NULLing of clocks in pvr_device_clk_init()
- Use dev_err_probe() on clock acquisition failure
- Remove PVR_CR_READ/WRITE helper macros
- Improve documentation for GPU clocks
- Remove regs resource (not used in this commit)

Co-developed-by: Frank Binns <frank.binns@imgtec.com>
Signed-off-by: Frank Binns <frank.binns@imgtec.com>
Co-developed-by: Matt Coster <matt.coster@imgtec.com>
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/579027bd5be4eb3218c9784050ded2326ecbc352.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/gpu/drm/imagination/pvr_drv.c b/drivers/gpu/drm/imagination/pvr_drv.c
index 3d4f2ba2c015..597188b31f96 100644
--- a/drivers/gpu/drm/imagination/pvr_drv.c
+++ b/drivers/gpu/drm/imagination/pvr_drv.c
@@ -464,6 +464,7 @@ pvr_probe(struct platform_device *plat_dev)
 {
 	struct pvr_device *pvr_dev;
 	struct drm_device *drm_dev;
+	int err;
 
 	pvr_dev = devm_drm_dev_alloc(&plat_dev->dev, &pvr_drm_driver,
 				     struct pvr_device, base);
@@ -474,14 +475,29 @@ pvr_probe(struct platform_device *plat_dev)
 
 	platform_set_drvdata(plat_dev, drm_dev);
 
-	return drm_dev_register(drm_dev, 0);
+	err = pvr_device_init(pvr_dev);
+	if (err)
+		return err;
+
+	err = drm_dev_register(drm_dev, 0);
+	if (err)
+		goto err_device_fini;
+
+	return 0;
+
+err_device_fini:
+	pvr_device_fini(pvr_dev);
+
+	return err;
 }
 
 static int
 pvr_remove(struct platform_device *plat_dev)
 {
 	struct drm_device *drm_dev = platform_get_drvdata(plat_dev);
+	struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
 
+	pvr_device_fini(pvr_dev);
 	drm_dev_unplug(drm_dev);
 
 	return 0;