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path: root/drivers/gpu/drm/pl111/pl111_drv.c
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Diffstat (limited to 'drivers/gpu/drm/pl111/pl111_drv.c')
-rw-r--r--drivers/gpu/drm/pl111/pl111_drv.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index 4621259d5387..454ff0804642 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -60,6 +60,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_graph.h>
+#include <linux/of_reserved_mem.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
@@ -207,6 +208,24 @@ finish:
return ret;
}
+static struct drm_gem_object *
+pl111_gem_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sgt)
+{
+ struct pl111_drm_dev_private *priv = dev->dev_private;
+
+ /*
+ * When using device-specific reserved memory we can't import
+ * DMA buffers: those are passed by reference in any global
+ * memory and we can only handle a specific range of memory.
+ */
+ if (priv->use_device_memory)
+ return ERR_PTR(-EINVAL);
+
+ return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
+}
+
DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
static struct drm_driver pl111_drm_driver = {
@@ -227,7 +246,7 @@ static struct drm_driver pl111_drm_driver = {
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = drm_gem_prime_import,
- .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+ .gem_prime_import_sg_table = pl111_gem_import_sg_table,
.gem_prime_export = drm_gem_prime_export,
.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
@@ -257,6 +276,12 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
drm->dev_private = priv;
priv->variant = variant;
+ ret = of_reserved_mem_device_init(dev);
+ if (!ret) {
+ dev_info(dev, "using device-specific reserved memory\n");
+ priv->use_device_memory = true;
+ }
+
if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
&priv->memory_bw)) {
dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
@@ -275,7 +300,8 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
if (IS_ERR(priv->regs)) {
dev_err(dev, "%s failed mmio\n", __func__);
- return PTR_ERR(priv->regs);
+ ret = PTR_ERR(priv->regs);
+ goto dev_unref;
}
/* This may override some variant settings */
@@ -305,11 +331,14 @@ static int pl111_amba_probe(struct amba_device *amba_dev,
dev_unref:
drm_dev_unref(drm);
+ of_reserved_mem_device_release(dev);
+
return ret;
}
static int pl111_amba_remove(struct amba_device *amba_dev)
{
+ struct device *dev = &amba_dev->dev;
struct drm_device *drm = amba_get_drvdata(amba_dev);
struct pl111_drm_dev_private *priv = drm->dev_private;
@@ -319,6 +348,7 @@ static int pl111_amba_remove(struct amba_device *amba_dev)
drm_panel_bridge_remove(priv->bridge);
drm_mode_config_cleanup(drm);
drm_dev_unref(drm);
+ of_reserved_mem_device_release(dev);
return 0;
}