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drm/i915: Throw away the BIOS fb if has the wrong depth/bpp

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Respect the user's choice of depth/bpp for the fbdev framebuffer
and throw out the fb we inherited from the BIOS if it doesn't
match.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20260511214122.8468-4-ville.syrjala@linux.intel.com
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
This commit is contained in:
Ville Syrjälä 2026-05-12 00:41:11 +03:00 committed by Maarten Lankhorst
parent b2a2c62040
commit d6a1bc7c9b
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/display/intel_fbdev.c
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@ -268,6 +268,8 @@ static bool bios_fb_ok(const struct intel_framebuffer *fb,
struct intel_display *display = to_intel_display(fb->base.dev);
int width = fb->base.width;
int height = fb->base.height;
int depth = fb->base.format->depth;
int bpp = fb->base.format->cpp[0] * 8;
if (sizes->fb_width > width || sizes->fb_height > height) {
drm_dbg_kms(display->drm,
@ -276,6 +278,13 @@ static bool bios_fb_ok(const struct intel_framebuffer *fb,
return false;
}
if (sizes->surface_depth != depth || sizes->surface_bpp != bpp) {
drm_dbg_kms(display->drm,
"BIOS fb using wrong depth/bpp (%d/%d), we require (%d/%d), releasing it\n",
depth, bpp, sizes->surface_depth, sizes->surface_bpp);
return false;
}
return true;
}