We trim the fb to fit the CRTC by computing the offset of that CRTC to
its nearest tile_row origin. This allows us to use framebuffers that are
larger than the CRTC limits without additional work.
However, we failed to compute the offset for a linear framebuffer
correctly as we treated its x-advance in whole tiles (instead of the
linear increment expected), leaving the CRTC misaligned with its
contents.
Fixes regression from commit c2c75131244507c93f812862fdbd4f3a37139401
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date: Thu Jul 5 12:17:30 2012 +0200
drm/i915: adjust framebuffer base address on gen4+
v2: Adjust relative x-coordinate after linear alignment (vsyrjala)
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61152
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: stable at vger.kernel.org
---
drivers/gpu/drm/i915/intel_display.c | 33 +++++++++++++++++++++++----------
drivers/gpu/drm/i915/intel_drv.h | 3 ++-
drivers/gpu/drm/i915/intel_sprite.c | 6 ++++--
3 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a3ca9a8..c32c0dc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1906,18 +1906,29 @@ void intel_unpin_fb_obj(struct drm_i915_gem_object *obj)
/* Computes the linear offset to the base tile and adjusts x, y. bytes per pixel
* is assumed to be a power-of-two. */
-unsigned long intel_gen4_compute_offset_xtiled(int *x, int *y,
- unsigned int bpp,
+unsigned long intel_gen4_compute_planar_offset(int *x, int *y,
+ unsigned int tiling_mode,
+ unsigned int cpp,
unsigned int pitch)
{
- int tile_rows, tiles;
+ if (tiling_mode != I915_TILING_NONE) {
+ int tile_rows, tiles;
- tile_rows = *y / 8;
- *y %= 8;
- tiles = *x / (512/bpp);
- *x %= 512/bpp;
+ tile_rows = *y / 8;
+ *y %= 8;
- return tile_rows * pitch * 8 + tiles * 4096;
+ tiles = *x / (512/cpp);
+ *x %= 512/cpp;
+
+ return tile_rows * pitch * 8 + tiles * 4096;
+ } else {
+ int offset;
+
+ offset = *y * pitch + *x * cpp;
+ *y = 0;
+ *x = (offset & 4095) / cpp;
+ return offset & -4096;
+ }
}
static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
@@ -1993,7 +2004,8 @@ static int i9xx_update_plane(struct drm_crtc *crtc, struct drm_framebuffer *fb,
if (INTEL_INFO(dev)->gen >= 4) {
intel_crtc->dspaddr_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
+ intel_gen4_compute_planar_offset(&x, &y,
+ obj->tiling_mode,
fb->bits_per_pixel / 8,
fb->pitches[0]);
linear_offset -= intel_crtc->dspaddr_offset;
@@ -2085,7 +2097,8 @@ static int ironlake_update_plane(struct drm_crtc *crtc,
linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);
intel_crtc->dspaddr_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
+ intel_gen4_compute_planar_offset(&x, &y,
+ obj->tiling_mode,
fb->bits_per_pixel / 8,
fb->pitches[0]);
linear_offset -= intel_crtc->dspaddr_offset;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 3a671d5..f5ad87b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -671,7 +671,8 @@ extern void intel_update_sprite_watermarks(struct drm_device *dev, int pipe,
extern void intel_update_linetime_watermarks(struct drm_device *dev, int pipe,
struct drm_display_mode *mode);
-extern unsigned long intel_gen4_compute_offset_xtiled(int *x, int *y,
+extern unsigned long intel_gen4_compute_planar_offset(int *x, int *y,
+ unsigned int tiling_mode,
unsigned int bpp,
unsigned int pitch);
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 03cfd62..ea90077 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -119,7 +119,8 @@ ivb_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
linear_offset = y * fb->pitches[0] + x * pixel_size;
sprsurf_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
+ intel_gen4_compute_planar_offset(&x, &y,
+ obj->tiling_mode,
pixel_size, fb->pitches[0]);
linear_offset -= sprsurf_offset;
@@ -292,7 +293,8 @@ ilk_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
linear_offset = y * fb->pitches[0] + x * pixel_size;
dvssurf_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
+ intel_gen4_compute_planar_offset(&x, &y,
+ obj->tiling_mode,
pixel_size, fb->pitches[0]);
linear_offset -= dvssurf_offset;
--
1.7.10.4
