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drm/simpledrm: Acquire memory aperture for framebuffer

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We register the simplekms device with the DRM platform helpers. A
native driver for the graphics hardware will kick-out the simpledrm
driver before taking over the device.

The original generic platform device from the simple-framebuffer boot
code will be unregistered. The native driver will use whatever native
hardware device it received.

v4:
	* convert to drm_aperture_acquire_from_firmware()
v3:
	* use platform_device_unregister() and handle detachment
	  like hot-unplug event (Daniel)
v2:
	* adapt to aperture changes
	* use drm_dev_unplug() and drm_dev_enter/exit()
	* don't split error string

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: nerdopolis <bluescreen_avenger@verizon.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-10-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-04-30 12:58:40 +02:00
parent 11e8f5fd22
commit 4aae79f77e
1 changed files with 24 additions and 1 deletions
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25
drivers/gpu/drm/tiny/simpledrm.c
View file

@ -6,6 +6,7 @@
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_aperture.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_damage_helper.h>
@ -517,14 +518,23 @@ static int simpledrm_device_init_fb(struct simpledrm_device *sdev)
static int simpledrm_device_init_mm(struct simpledrm_device *sdev)
{
struct drm_device *dev = &sdev->dev;
struct platform_device *pdev = sdev->pdev;
struct resource *mem;
void __iomem *screen_base;
int ret;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem)
return -EINVAL;
ret = devm_aperture_acquire_from_firmware(dev, mem->start, resource_size(mem));
if (ret) {
drm_err(dev, "could not acquire memory range [0x%llx:0x%llx]: error %d\n",
mem->start, mem->end, ret);
return ret;
}
screen_base = devm_ioremap_wc(&pdev->dev, mem->start,
resource_size(mem));
if (!screen_base)
@ -625,12 +635,18 @@ simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
struct drm_framebuffer *fb = plane_state->fb;
void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
struct drm_device *dev = &sdev->dev;
int idx;
if (!fb)
return;
if (!drm_dev_enter(dev, &idx))
return;
drm_fb_blit_dstclip(sdev->screen_base, sdev->pitch,
sdev->format->format, vmap, fb);
drm_dev_exit(idx);
}
static void
@ -658,7 +674,9 @@ simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
struct drm_framebuffer *fb = plane_state->fb;
struct drm_device *dev = &sdev->dev;
struct drm_rect clip;
int idx;
if (!fb)
return;
@ -666,8 +684,13 @@ simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
if (!drm_atomic_helper_damage_merged(old_plane_state, plane_state, &clip))
return;
if (!drm_dev_enter(dev, &idx))
return;
drm_fb_blit_rect_dstclip(sdev->screen_base, sdev->pitch,
sdev->format->format, vmap, fb, &clip);
drm_dev_exit(idx);
}
static const struct drm_simple_display_pipe_funcs
@ -847,7 +870,7 @@ static int simpledrm_remove(struct platform_device *pdev)
struct simpledrm_device *sdev = platform_get_drvdata(pdev);
struct drm_device *dev = &sdev->dev;
drm_dev_unregister(dev);
drm_dev_unplug(dev);
return 0;
}