drm/nv50/disp: completely reset disp if master evo channel active at init

Should fix issues with kexec, and as a nice side bonus, the code to avoid
having PDISP disappear will also fix hibernate on those effected systems.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index a37e32e..cfd7a82 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -50,9 +50,50 @@ nv50_sor_nr(struct drm_device *dev)
        return 4;
 }
 
+static int
+evo_icmd(struct drm_device *dev, int ch, u32 mthd, u32 data)
+{
+       int ret = 0;
+       if (nouveau_reg_debug & NOUVEAU_REG_DEBUG_EVO)
+               NV_INFO(dev, "EvoPIO: %d 0x%04x 0x%08x\n", ch, mthd, data);
+       nv_mask(dev, 0x610300 + (ch * 0x08), 0x00000001, 0x00000001);
+       nv_wr32(dev, 0x610304 + (ch * 0x08), data);
+       nv_wr32(dev, 0x610300 + (ch * 0x08), 0x80000001 | mthd);
+       if (!nv_wait(dev, 0x610300 + (ch * 0x08), 0x80000000, 0x00000000))
+               ret = -EBUSY;
+       nv_mask(dev, 0x610300 + (ch * 0x08), 0x00000001, 0x00000000);
+       return ret;
+}
+
 int
 nv50_display_early_init(struct drm_device *dev)
 {
+       int i;
+       /* check if master evo channel is already active, a good a sign as any
+        * that the display engine is in a weird state (hibernate/kexec), if
+        * it is, do our best to reset the display engine...
+        */
+       if (nv_rd32(dev, 0x610200) & 0x00000001) {
+               NV_INFO(dev, "PDISP: already active, attempting to reset...\n");
+
+               /* deactivate both heads first, PDISP will disappear forever
+                * (well, until you power cycle) on some boards as soon as
+                * PMC_ENABLE is hit unless they are..
+                */
+               for (i = 0; i < 2; i++) {
+                       evo_icmd(dev, 0, 0x0880 + (i * 0x400), 0x05000000);
+                       evo_icmd(dev, 0, 0x089c + (i * 0x400), 0);
+                       evo_icmd(dev, 0, 0x0840 + (i * 0x400), 0);
+                       evo_icmd(dev, 0, 0x0844 + (i * 0x400), 0);
+                       evo_icmd(dev, 0, 0x085c + (i * 0x400), 0);
+                       evo_icmd(dev, 0, 0x0874 + (i * 0x400), 0);
+               }
+               evo_icmd(dev, 0, 0x0080, 0);
+
+               /* reset PDISP */
+               nv_mask(dev, 0x000200, 0x40000000, 0x00000000);
+               nv_mask(dev, 0x000200, 0x40000000, 0x40000000);
+       }
        return 0;
 }