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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2022-06-01 14:25:16 +0300 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-06-07 10:39:51 +0300 |
| commit | d45e32c9d98ce7c22a4bafe69cee58165b59533b (patch) | |
| tree | 0479e9f3cb16036722eb011b6c73c192530b5a35 /drivers/gpu/drm/mgag200/mgag200_drv.c | |
| parent | ce19021fd99ab2c915f2b44b0df39bef75f11d18 (diff) | |
| download | linux-d45e32c9d98ce7c22a4bafe69cee58165b59533b.tar.xz | |
drm/mgag200: Call mgag200_device_probe_vram() from per-model init
Call mgag200_device_probe_vram() from each model's initializer. The
G200EW3 uses a special helper with additional instructions.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220601112522.5774-5-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/mgag200/mgag200_drv.c')
| -rw-r--r-- | drivers/gpu/drm/mgag200/mgag200_drv.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c index ea765c1abcc1..1d53ddcc00df 100644 --- a/drivers/gpu/drm/mgag200/mgag200_drv.c +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c @@ -50,6 +50,45 @@ int mgag200_init_pci_options(struct pci_dev *pdev, u32 option, u32 option2) return 0; } +resource_size_t mgag200_probe_vram(void __iomem *mem, resource_size_t size) +{ + int offset; + int orig; + int test1, test2; + int orig1, orig2; + size_t vram_size; + + /* Probe */ + orig = ioread16(mem); + iowrite16(0, mem); + + vram_size = size; + + for (offset = 0x100000; offset < vram_size; offset += 0x4000) { + orig1 = ioread8(mem + offset); + orig2 = ioread8(mem + offset + 0x100); + + iowrite16(0xaa55, mem + offset); + iowrite16(0xaa55, mem + offset + 0x100); + + test1 = ioread16(mem + offset); + test2 = ioread16(mem); + + iowrite16(orig1, mem + offset); + iowrite16(orig2, mem + offset + 0x100); + + if (test1 != 0xaa55) + break; + + if (test2) + break; + } + + iowrite16(orig, mem); + + return offset - 65536; +} + /* * DRM driver */ |