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Code Issues Releases Wiki Activity

video: fbdev: hyperv_fb: Allow resolutions with size > 64 MB for Gen1

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This patch fixes a bug where GEN1 VMs doesn't allow resolutions greater
than 64 MB size (eg 7680x4320). Unnecessary PCI check limits Gen1 VRAM
to legacy PCI BAR size only (ie 64MB). Thus any, resolution requesting
greater then 64MB (eg 7680x4320) would fail. MMIO region assigning this
memory shouldn't be limited by PCI bar size.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Saurabh Sengar 2022-04-27 06:47:53 -07:00 committed by Helge Deller
parent 42226c9897
commit c4b4d7047f
1 changed files with 1 additions and 18 deletions
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19
drivers/video/fbdev/hyperv_fb.c
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@ -1009,7 +1009,6 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
struct pci_dev *pdev = NULL;
void __iomem *fb_virt;
int gen2vm = efi_enabled(EFI_BOOT);
resource_size_t pot_start, pot_end;
phys_addr_t paddr;
int ret;
@ -1060,23 +1059,7 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
dio_fb_size =
screen_width * screen_height * screen_depth / 8;
if (gen2vm) {
pot_start = 0;
pot_end = -1;
} else {
if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
pci_resource_len(pdev, 0) < screen_fb_size) {
pr_err("Resource not available or (0x%lx < 0x%lx)\n",
(unsigned long) pci_resource_len(pdev, 0),
(unsigned long) screen_fb_size);
goto err1;
}
pot_end = pci_resource_end(pdev, 0);
pot_start = pot_end - screen_fb_size + 1;
}
ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end,
ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1,
screen_fb_size, 0x100000, true);
if (ret != 0) {
pr_err("Unable to allocate framebuffer memory\n");