drm/nv04: Fix scanout over the 16MB mark.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

2 files changed, 20 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_hw.h b/drivers/gpu/drm/nouveau/nouveau_hw.h
index 869130f83602..2989090b9434 100644
--- a/drivers/gpu/drm/nouveau/nouveau_hw.h
+++ b/drivers/gpu/drm/nouveau/nouveau_hw.h
@@ -416,6 +416,25 @@ nv_fix_nv40_hw_cursor(struct drm_device *dev, int head)
 }
 
 static inline void
+nv_set_crtc_base(struct drm_device *dev, int head, uint32_t offset)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        NVWriteCRTC(dev, head, NV_PCRTC_START, offset);
+
+        if (dev_priv->card_type == NV_04) {
+                /*
+                 * Hilarious, the 24th bit doesn't want to stick to
+                 * PCRTC_START...
+                 */
+                int cre_heb = NVReadVgaCrtc(dev, head, NV_CIO_CRE_HEB__INDEX);
+
+                NVWriteVgaCrtc(dev, head, NV_CIO_CRE_HEB__INDEX,
+                               (cre_heb & ~0x40) | ((offset >> 18) & 0x40));
+        }
+}
+
+static inline void
 nv_show_cursor(struct drm_device *dev, int head, bool show)
 {
         struct drm_nouveau_private *dev_priv = dev->dev_private;
diff --git a/drivers/gpu/drm/nouveau/nv04_crtc.c b/drivers/gpu/drm/nouveau/nv04_crtc.c
index c71abc2a34d5..5b49cec528ee 100644
--- a/drivers/gpu/drm/nouveau/nv04_crtc.c
+++ b/drivers/gpu/drm/nouveau/nv04_crtc.c
@@ -831,7 +831,7 @@ nv04_crtc_do_mode_set_base(struct drm_crtc *crtc,
         /* Update the framebuffer location. */
         regp->fb_start = nv_crtc->fb.offset & ~3;
         regp->fb_start += (y * drm_fb->pitch) + (x * drm_fb->bits_per_pixel / 8);
-        NVWriteCRTC(dev, nv_crtc->index, NV_PCRTC_START, regp->fb_start);
+        nv_set_crtc_base(dev, nv_crtc->index, regp->fb_start);
 
         /* Update the arbitration parameters. */
         nouveau_calc_arb(dev, crtc->mode.clock, drm_fb->bits_per_pixel,