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 <[email protected]>
Cc: [email protected]
---
V2: move to atomic_update
Tested on IBM 43p Model 150 (7043-150) running T2/Linux.
---
drivers/gpu/drm/mgag200/mgag200_mode.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c
b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 951d715dea30..d40434ec68ab 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -496,6 +496,20 @@ void mgag200_primary_plane_helper_atomic_update(struct
drm_plane *plane,
struct drm_atomic_helper_damage_iter iter;
struct drm_rect damage;
+#ifdef __BIG_ENDIAN
+ /* Big-endian byte-swapping */
+ switch (fb->format->format) {
+ case DRM_FORMAT_RGB565:
+ WREG32(MGAREG_OPMODE, 0x10100);
+ break;
+ case DRM_FORMAT_XRGB8888:
+ WREG32(MGAREG_OPMODE, 0x20200);
+ break;
+ default:
+ break;
+ }
+#endif
+
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);
--
2.52.0
--
René Rebe, ExactCODE GmbH, Berlin, Germany
https://exactco.de • https://t2linux.com • https://patreon.com/renerebe
