[ 091/150] drm/i915: Handle untiled planes when computing their offsets

Greg Kroah-Hartman
2013-02-27T00:58:09Z

From: Chris Wilson <chris@chris-wilson.co.uk>

commit bc752862170c135d6c09fb22d79eeb451023568e upstream.

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@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)
v3: Repaint with pokadots (vsyrjala)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61152
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/i915/intel_display.c | 41 ++++++++++++++++++++++-------------
drivers/gpu/drm/i915/intel_drv.h | 7 +++--
drivers/gpu/drm/i915/intel_sprite.c | 8 +++---
3 files changed, 34 insertions(+), 22 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2017,18 +2017,29 @@ void intel_unpin_fb_obj(struct drm_i915_

/* 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 int pitch)
+unsigned long intel_gen4_compute_page_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) {
+ unsigned 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 {
+ unsigned 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,
@@ -2105,9 +2116,9 @@ static int i9xx_update_plane(struct drm_

if (INTEL_INFO(dev)->gen >= 4) {
intel_crtc->dspaddr_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
- fb->bits_per_pixel / 8,
- fb->pitches[0]);
+ intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
+ fb->bits_per_pixel / 8,
+ fb->pitches[0]);
linear_offset -= intel_crtc->dspaddr_offset;
} else {
intel_crtc->dspaddr_offset = linear_offset;
@@ -2198,9 +2209,9 @@ static int ironlake_update_plane(struct

linear_offset = y * fb->pitches[0] + x * (fb->bits_per_pixel / 8);
intel_crtc->dspaddr_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
- fb->bits_per_pixel / 8,
- fb->pitches[0]);
+ intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
+ fb->bits_per_pixel / 8,
+ fb->pitches[0]);
linear_offset -= intel_crtc->dspaddr_offset;

DRM_DEBUG_KMS("Writing base %08X %08lX %d %d %d\n",
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -627,9 +627,10 @@ extern void intel_update_sprite_watermar
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,
- unsigned int bpp,
- unsigned int pitch);
+extern unsigned long intel_gen4_compute_page_offset(int *x, int *y,
+ unsigned int tiling_mode,
+ unsigned int bpp,
+ unsigned int pitch);

extern int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
struct drm_file *file_priv);
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -122,8 +122,8 @@ ivb_update_plane(struct drm_plane *plane

linear_offset = y * fb->pitches[0] + x * pixel_size;
sprsurf_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
- pixel_size, fb->pitches[0]);
+ intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
+ pixel_size, fb->pitches[0]);
linear_offset -= sprsurf_offset;

/* HSW consolidates SPRTILEOFF and SPRLINOFF into a single SPROFFSET
@@ -287,8 +287,8 @@ ilk_update_plane(struct drm_plane *plane

linear_offset = y * fb->pitches[0] + x * pixel_size;
dvssurf_offset =
- intel_gen4_compute_offset_xtiled(&x, &y,
- pixel_size, fb->pitches[0]);
+ intel_gen4_compute_page_offset(&x, &y, obj->tiling_mode,
+ pixel_size, fb->pitches[0]);
linear_offset -= dvssurf_offset;

if (obj->tiling_mode != I915_TILING_NONE)