drm/radeon/kms: r420 idle after programming GA_ENHANCE

https://bugs.freedesktop.org/show_bug.cgi?id=24041

The idle allows rs690 to startup properly.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/r420.c b/drivers/gpu/drm/radeon/r420.c
index 9b38956..49a2fdc 100644 (file)
--- a/drivers/gpu/drm/radeon/r420.c
+++ b/drivers/gpu/drm/radeon/r420.c
@@ -64,6 +64,11 @@ void r420_pipes_init(struct radeon_device *rdev)
 
        /* GA_ENHANCE workaround TCL deadlock issue */
        WREG32(0x4274, (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3));
+       /* add idle wait as per freedesktop.org bug 24041 */
+       if (r100_gui_wait_for_idle(rdev)) {
+               printk(KERN_WARNING "Failed to wait GUI idle while "
+                      "programming pipes. Bad things might happen.\n");
+       }
        /* get max number of pipes */
        gb_pipe_select = RREG32(0x402C);
        num_pipes = ((gb_pipe_select >> 12) & 3) + 1;