[PATCH xf86-video-amdgpu] Don't advertise rotation support without hardware acceleration

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

Rotation currently doesn't work without acceleration (doesn't actually
rotate with Option "NoAccel", crashes with Option "AccelMethod" "none"
or when glamor fails to initialize) and would probably be too slow
anyway.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 src/drmmode_display.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index d75a629..b9fa366 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -918,7 +918,7 @@ static Bool drmmode_set_scanout_pixmap(xf86CrtcPtr crtc, PixmapPtr ppix)
 }
 #endif
 
-static const xf86CrtcFuncsRec drmmode_crtc_funcs = {
+static xf86CrtcFuncsRec drmmode_crtc_funcs = {
 	.dpms = drmmode_crtc_dpms,
 	.set_mode_major = drmmode_set_mode_major,
 	.set_cursor_colors = drmmode_set_cursor_colors,
@@ -1872,6 +1872,7 @@ static void drm_wakeup_handler(pointer data, int err, pointer p)
 Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp)
 {
 	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(pScrn);
+	AMDGPUInfoPtr info = AMDGPUPTR(pScrn);
 	int i, num_dvi = 0, num_hdmi = 0;
 	unsigned int crtcs_needed = 0;
 	drmModeResPtr mode_res;
@@ -1896,6 +1897,13 @@ Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp)
 	xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, AMDGPU_LOGLEVEL_DEBUG,
 		       "%d crtcs needed for screen.\n", crtcs_needed);
 
+	if (!info->use_glamor) {
+		/* Rotation requires hardware acceleration */
+		drmmode_crtc_funcs.shadow_allocate = NULL;
+		drmmode_crtc_funcs.shadow_create = NULL;
+		drmmode_crtc_funcs.shadow_destroy = NULL;
+	}
+
 	for (i = 0; i < mode_res->count_crtcs; i++)
 		if (!xf86IsEntityShared(pScrn->entityList[0]) ||
 		    (crtcs_needed && !(pAMDGPUEnt->assigned_crtcs & (1 << i))))
-- 
2.6.0