diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2018-10-29 21:50:48 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2018-10-30 14:42:28 +0100 |
| commit | 01f23459cf93a57d11bd93e660460f135b237af5 (patch) | |
| tree | 0f3363e3d50b27e06940ea134e88515351defaa1 /drivers/gpu/drm/bochs/bochs_hw.c | |
| parent | cf6d100dd238d4be92f38fbba246a2d85427b9a0 (diff) | |
drm/bochs: add edid support.
Recent qemu (latest master branch, upcoming 3.1 release) got support
for EDID data. This patch adds guest driver support.
EDID support in qemu is not (yet) enabled by default, so please use
'qemu -device VGA,edid=on' for testing.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20181029205048.13200-1-kraxel@redhat.com
Diffstat (limited to 'drivers/gpu/drm/bochs/bochs_hw.c')
| -rw-r--r-- | drivers/gpu/drm/bochs/bochs_hw.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c index cacff73a64ab..c90a0d492fd5 100644 --- a/drivers/gpu/drm/bochs/bochs_hw.c +++ b/drivers/gpu/drm/bochs/bochs_hw.c @@ -69,6 +69,35 @@ static void bochs_hw_set_little_endian(struct bochs_device *bochs) #define bochs_hw_set_native_endian(_b) bochs_hw_set_little_endian(_b) #endif +static int bochs_get_edid_block(void *data, u8 *buf, + unsigned int block, size_t len) +{ + struct bochs_device *bochs = data; + size_t i, start = block * EDID_LENGTH; + + if (start + len > 0x400 /* vga register offset */) + return -1; + + for (i = 0; i < len; i++) { + buf[i] = readb(bochs->mmio + start + i); + } + return 0; +} + +int bochs_hw_load_edid(struct bochs_device *bochs) +{ + if (!bochs->mmio) + return -1; + + kfree(bochs->edid); + bochs->edid = drm_do_get_edid(&bochs->connector, + bochs_get_edid_block, bochs); + if (bochs->edid == NULL) + return -1; + + return 0; +} + int bochs_hw_init(struct drm_device *dev) { struct bochs_device *bochs = dev->dev_private; @@ -164,6 +193,7 @@ void bochs_hw_fini(struct drm_device *dev) if (bochs->fb_map) iounmap(bochs->fb_map); pci_release_regions(dev->pdev); + kfree(bochs->edid); } void bochs_hw_setmode(struct bochs_device *bochs, |