drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 upstream.
- Stop the displays from accessing the FB
- Block CPU access
- Turn off MC client access
This should fix issues some users have seen, especially
with UEFI, when changing the MC FB location that result
in hangs or display corruption.
v2: fix crtc enabled check noticed by Luca Tettamanti
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index 2eaaea0..81e744f 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -77,6 +77,10 @@
#define CONFIG_MEMSIZE 0x5428
+#define BIF_FB_EN 0x5490
+#define FB_READ_EN (1 << 0)
+#define FB_WRITE_EN (1 << 1)
+
#define CP_STRMOUT_CNTL 0x84FC
#define CP_COHER_CNTL 0x85F0
@@ -200,6 +204,9 @@
#define NOOFCHAN_MASK 0x00003000
#define MC_SHARED_CHREMAP 0x2008
+#define MC_SHARED_BLACKOUT_CNTL 0x20ac
+#define BLACKOUT_MODE_MASK 0x00000007
+
#define MC_ARB_RAMCFG 0x2760
#define NOOFBANK_SHIFT 0
#define NOOFBANK_MASK 0x00000003