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drm/mgag200: Fix big-endian support

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Unlike the original, deleted Matrox mga driver, the new mgag200 driver
has the XRGB frame-buffer byte swapped on big-endian "RISC"
systems. Fix by enabling byte swapping "PowerPC" OPMODE for any
__BIG_ENDIAN config.

Fixes: 414c453106 ("mgag200: initial g200se driver (v2)")
Signed-off-by: René Rebe <rene@exactco.de>
Cc: stable@kernel.org
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20251208.141827.965103015954471168.rene@exactco.de
This commit is contained in:
René Rebe 2025-12-08 14:18:27 +01:00 • committed by Thomas Zimmermann
parent a585c7ef9c
commit 6cb31fba13
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/mgag200/mgag200_mode.c
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@ -161,6 +161,30 @@ static void mgag200_set_startadd(struct mga_device *mdev,
WREG_ECRT(0x00, crtcext0);
}
/*
* Set the opmode for the hardware swapper for Big-Endian processor
* support for the frame buffer aperture and DMAWIN space.
*/
static void mgag200_set_datasiz(struct mga_device *mdev, u32 format)
{
#if defined(__BIG_ENDIAN)
u32 opmode = RREG32(MGAREG_OPMODE);
opmode &= ~(GENMASK(17, 16) | GENMASK(9, 8) | GENMASK(3, 2));
/* Big-endian byte-swapping */
switch (format) {
case DRM_FORMAT_RGB565:
opmode |= 0x10100;
break;
case DRM_FORMAT_XRGB8888:
opmode |= 0x20200;
break;
}
WREG32(MGAREG_OPMODE, opmode);
#endif
}
void mgag200_init_registers(struct mga_device *mdev)
{
u8 crtc11, misc;
@ -496,6 +520,7 @@ void mgag200_primary_plane_helper_atomic_update(struct drm_plane *plane,
struct drm_atomic_helper_damage_iter iter;
struct drm_rect damage;
mgag200_set_datasiz(mdev, fb->format->format);
drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
drm_atomic_for_each_plane_damage(&iter, &damage) {
mgag200_handle_damage(mdev, shadow_plane_state->data, fb, &damage);