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authorLinus Walleij2018-05-02 15:47:19 +0200
committerLinus Walleij2018-05-02 19:13:42 +0200
commit57450671776b37d7c81cd52a89982c14bca46cfc (patch)
treed819743252c2f0f036184f37570e7ded4616baa4 /drivers/gpu/drm/pl111
parentca454bd42dc24374150febf83a443e8c1d9cf28a (diff)
drm/pl111: Enable device-specific assigned memory
The Versatile Express has 8 MB of dedicated video RAM (VRAM) on the motherboard, which is what we should be using for the PL111 if available. On this platform, the memory backplane is constructed so that only this memory will work properly with the CLCD on the motherboard, using any other memory area just gives random snow on the display. The CA9 Versatile Express also has a PL111 instance on its core tile that can address all memory, and this does not have the restriction. The memory is assigned to the device using the memory-region device tree property and a "shared-dma-pool" reserved memory pool like this: reserved-memory { #address-cells = <1>; #size-cells = <1>; ranges; vram: vram@48000000 { compatible = "shared-dma-pool"; reg = <0x48000000 0x00800000>; no-map; }; }; clcd@1f000 { compatible = "arm,pl111", "arm,primecell"; (...) memory-region = <&vram>; }ยท; Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Mali DP Maintainers <malidp@foss.arm.com> Reviewed-by: Eric Anholt <eric@anholt.net> Tested-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180502134719.8388-2-linus.walleij@linaro.org
Diffstat (limited to 'drivers/gpu/drm/pl111')
-rw-r--r--drivers/gpu/drm/pl111/pl111_drm.h1
-rw-r--r--drivers/gpu/drm/pl111/pl111_drv.c34
2 files changed, 33 insertions, 2 deletions
diff --git a/drivers/gpu/drm/pl111/pl111_drm.h b/drivers/gpu/drm/pl111/pl111_drm.h
index 8639b2d4ddf7..ce4501d0ab48 100644
--- a/drivers/gpu/drm/pl111/pl111_drm.h
+++ b/drivers/gpu/drm/pl111/pl111_drm.h
@@ -79,6 +79,7 @@ struct pl111_drm_dev_private {
const struct pl111_variant_data *variant;
void (*variant_display_enable) (struct drm_device *drm, u32 format);
void (*variant_display_disable) (struct drm_device *drm);
+ bool use_device_memory;
};
int pl111_display_init(struct drm_device *dev);
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;
}