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drm/i915: Reject BIOS FB rotation in common code

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Reject 90/270 degree rotated BIOS framebuffers in common
code. Currently skl_get_initial_plane_config() already rejects
these, but we may want to implement the missing parts there
so that skl_get_initial_plane_config() could be reused for
general plane state verification purposes.

90/270 degree rotated framebuffers require two completely
separate GGTT mappings (0 degree for the CPU, 270 degree
for the display engine), and the rest of the BIOS FB
takeover code is not prepared for that.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260410150449.9699-11-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2026-04-10 18:04:49 +03:00
parent 9af46eb338
commit 53978256a8
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/display/intel_initial_plane.c
View File

@ -3,6 +3,7 @@
#include <linux/iopoll.h>
#include <drm/drm_blend.h>
#include <drm/drm_print.h>
#include <drm/intel/display_parent_interface.h>
@ -101,6 +102,15 @@ intel_alloc_initial_plane_obj(struct intel_display *display,
return NULL;
}
/*
* Would need to preserve the 270 degree rotated
* GGTT mapping used by the display hardware.
*/
if (drm_rotation_90_or_270(plane_config->rotation)) {
drm_dbg_kms(display->drm, "90/270 degree rotation not supported for initial FB\n");
return NULL;
}
return display->parent->initial_plane->alloc_obj(display->drm, plane_config);
}