aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch54
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch b/target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch
new file mode 100644
index 0000000000..2c9449df0f
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0751-drm-vc4-Adopt-the-dma-configuration-from-the-HVS-or-.patch
@@ -0,0 +1,54 @@
+From 13c11f40ded81f258178936e9fa22788e59b82cf Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Tue, 19 May 2020 14:54:28 +0100
+Subject: [PATCH] drm/vc4: Adopt the dma configuration from the HVS or
+ V3D component
+
+vc4_drv isn't necessarily under the /soc node in DT as it is a
+virtual device, but it is the one that does the allocations.
+The DMA addresses are consumed by primarily the HVS or V3D, and
+those require VideoCore cache alias address mapping, and so will be
+under /soc.
+
+During probe find the a suitable device node for HVS or V3D,
+and adopt the DMA configuration of that node.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/gpu/drm/vc4/vc4_drv.c | 18 ++++++++++++++++++
+ 1 file changed, 18 insertions(+)
+
+--- a/drivers/gpu/drm/vc4/vc4_drv.c
++++ b/drivers/gpu/drm/vc4/vc4_drv.c
+@@ -249,6 +249,14 @@ static void vc4_match_add_drivers(struct
+ }
+ }
+
++const struct of_device_id vc4_dma_range_matches[] = {
++ { .compatible = "brcm,bcm2835-hvs" },
++ { .compatible = "brcm,bcm2835-v3d" },
++ { .compatible = "brcm,cygnus-v3d" },
++ { .compatible = "brcm,vc4-v3d" },
++ {}
++};
++
+ static int vc4_drm_bind(struct device *dev)
+ {
+ struct platform_device *pdev = to_platform_device(dev);
+@@ -269,6 +277,16 @@ static int vc4_drm_bind(struct device *d
+ vc4_drm_driver.driver_features &= ~DRIVER_RENDER;
+ of_node_put(node);
+
++ node = of_find_matching_node_and_match(NULL, vc4_dma_range_matches,
++ NULL);
++ if (node) {
++ ret = of_dma_configure(dev, node, true);
++ of_node_put(node);
++
++ if (ret)
++ return ret;
++ }
++
+ drm = drm_dev_alloc(&vc4_drm_driver, dev);
+ if (IS_ERR(drm))
+ return PTR_ERR(drm);