6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: René Rebe rene@exactco.de
commit 6cb31fba137d45e682ce455b8ea364f44d5d4f98 upstream.
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: 414c45310625 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/mgag200/mgag200_mode.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c @@ -173,6 +173,30 @@ static void mgag200_set_startadd(struct 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; @@ -502,6 +526,7 @@ void mgag200_primary_plane_helper_atomic 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);