bochs: ignore device if there isn't enougth memory

The qemu stdvga can be configured with a wide range of video memory,
from 1 MB to 256 MB (default is 16 MB).  In case it is configured
with only 1 or 2 MB it isn't really usable with bochsdrm, due to
depths other than 32bpp not being supported so that isn't enough
memory for a reasonable sized framebuffer.  So skip the device
and let vgacon or vesafb+fbcon handle the it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index abace82de6ea..aaae5e50d7c8 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -162,8 +162,15 @@ static int bochs_kick_out_firmware_fb(struct pci_dev *pdev)
 static int bochs_pci_probe(struct pci_dev *pdev,
                            const struct pci_device_id *ent)
 {
+        unsigned long fbsize;
         int ret;
 
+        fbsize = pci_resource_len(pdev, 0);
+        if (fbsize < 4 * 1024 * 1024) {
+                DRM_ERROR("less than 4 MB video memory, ignoring device\n");
+                return -ENOMEM;
+        }
+
         ret = bochs_kick_out_firmware_fb(pdev);
         if (ret)
                 return ret;