[PATCH 09/12] drm/i915: Make intel_adjust_tile_offset() work for linear buffers

ville.syrjala
2016-05-03T15:40:34Z

To make life less surprising we can make intel_adjust_tile_offset()
deal with linear buffers as well. Currently it doesn't seem like there's
a real need for this since only X tiling and NV12 (which would always
be tiled currently) should need it. But I've used it for some debug
hacks already so seems like a reasonable thing to have.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 73 ++++++++++++++++++++++++++++--------
1 file changed, 57 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 17f9f014e808..ad7c48757ba6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2347,19 +2347,16 @@ void intel_add_fb_offsets(int *x, int *y,
}

/*
- * Adjust the tile offset by moving the difference into
- * the x/y offsets.
- *
* Input tile dimensions and pitch must already be
* rotated to match x and y, and in pixel units.
*/
-static u32 intel_adjust_tile_offset(int *x, int *y,
- unsigned int tile_width,
- unsigned int tile_height,
- unsigned int tile_size,
- unsigned int pitch_tiles,
- u32 old_offset,
- u32 new_offset)
+static u32 _intel_adjust_tile_offset(int *x, int *y,
+ unsigned int tile_width,
+ unsigned int tile_height,
+ unsigned int tile_size,
+ unsigned int pitch_tiles,
+ u32 old_offset,
+ u32 new_offset)
{
unsigned int pitch_pixels = pitch_tiles * tile_width;
unsigned int tiles;
@@ -2381,6 +2378,50 @@ static u32 intel_adjust_tile_offset(int *x, int *y,
}

/*
+ * Adjust the tile offset by moving the difference into
+ * the x/y offsets.
+ */
+static u32 intel_adjust_tile_offset(int *x, int *y,
+ const struct intel_plane_state *state, int plane,
+ u32 old_offset, u32 new_offset)
+{
+ const struct drm_i915_private *dev_priv = to_i915(state->base.plane->dev);
+ const struct drm_framebuffer *fb = state->base.fb;
+ unsigned int cpp = drm_format_plane_cpp(fb->pixel_format, plane);
+ unsigned int rotation = state->base.rotation;
+ unsigned int pitch = intel_fb_pitch(fb, plane, rotation);
+
+ WARN_ON(new_offset > old_offset);
+
+ if (fb->modifier[plane] != DRM_FORMAT_MOD_NONE) {
+ unsigned int tile_size, tile_width, tile_height;
+ unsigned int pitch_tiles;
+
+ tile_size = intel_tile_size(dev_priv);
+ intel_tile_dims(dev_priv, &tile_width, &tile_height,
+ fb->modifier[plane], cpp);
+
+ if (intel_rotation_90_or_270(rotation)) {
+ pitch_tiles = pitch / tile_height;
+ swap(tile_width, tile_height);
+ } else {
+ pitch_tiles = pitch / (tile_width * cpp);
+ }
+
+ _intel_adjust_tile_offset(x, y, tile_width, tile_height,
+ tile_size, pitch_tiles,
+ old_offset, new_offset);
+ } else {
+ old_offset += *y * pitch + *x * cpp;
+
+ *y = (old_offset - new_offset) / pitch;
+ *x = ((old_offset - new_offset) - *y * pitch) / cpp;
+ }
+
+ return new_offset;
+}
+
+/*
* Computes the linear offset to the base tile and adjusts
* x, y. bytes per pixel is assumed to be a power-of-two.
*
@@ -2432,9 +2473,9 @@ static u32 _intel_compute_tile_offset(const struct drm_i915_private *dev_priv,
offset = (tile_rows * pitch_tiles + tiles) * tile_size;
offset_aligned = offset & ~alignment;

- intel_adjust_tile_offset(x, y, tile_width, tile_height,
- tile_size, pitch_tiles,
- offset, offset_aligned);
+ _intel_adjust_tile_offset(x, y, tile_width, tile_height,
+ tile_size, pitch_tiles,
+ offset, offset_aligned);
} else {
offset = *y * pitch + *x * cpp;
offset_aligned = offset & ~alignment;
@@ -2581,9 +2622,9 @@ intel_fill_fb_info(struct drm_i915_private *dev_priv,
* We only keep the x/y offsets, so push all of the
* gtt offset into the x/y offsets.
*/
- intel_adjust_tile_offset(&x, &y, tile_size,
- tile_width, tile_height, pitch_tiles,
- gtt_offset_rotated * tile_size, 0);
+ _intel_adjust_tile_offset(&x, &y, tile_size,
+ tile_width, tile_height, pitch_tiles,
+ gtt_offset_rotated * tile_size, 0);

gtt_offset_rotated += rot_info->plane[i].width * rot_info->plane[i].height;