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drm/armada: fix overlay when partially off-screen 

Fix the start address calculation when overlay is partially off screen.
fb->bits_per_pixel is not set for YUV formats, and is always zero, which
led to the first component always starting at zero.

Use drm_format_plane_cpp() instead.

This also revealed a problem in that YUYV formats toggle the U/V data
for odd pixel start address offsets.  We try to rectify that by
toggling the U/V swap, which for the most part works, but seemingly
introduces a flicker for one scan frame of swapped U/V.

However, these changes result in an overall improvement.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2015-06-15 10:18:02 +01:00
parent 98fb74f4ec
commit 73068ce3b5
1 changed files with 27 additions and 13 deletions
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40
drivers/gpu/drm/armada/armada_overlay.c
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@ -166,7 +166,8 @@ armada_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
if (plane->fb != fb) {
struct armada_gem_object *obj = drm_fb_obj(fb);
uint32_t sy, su, sv;
uint32_t addr[3], pixel_format;
int i, num_planes, hsub;
/*
* Take a reference on the new framebuffer - we want to
@ -188,24 +189,37 @@ armada_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
src_y = src.y1 >> 16;
src_x = src.x1 >> 16;
sy = obj->dev_addr + fb->offsets[0] + src_y * fb->pitches[0] +
src_x * fb->bits_per_pixel / 8;
su = obj->dev_addr + fb->offsets[1] + src_y * fb->pitches[1] +
src_x;
sv = obj->dev_addr + fb->offsets[2] + src_y * fb->pitches[2] +
src_x;
armada_reg_queue_set(dplane->vbl.regs, idx, sy,
pixel_format = fb->pixel_format;
hsub = drm_format_horz_chroma_subsampling(pixel_format);
num_planes = drm_format_num_planes(pixel_format);
/*
* Annoyingly, shifting a YUYV-format image by one pixel
* causes the U/V planes to toggle. Toggle the UV swap.
* (Unfortunately, this causes momentary colour flickering.)
*/
if (src_x & (hsub - 1) && num_planes == 1)
ctrl0 ^= CFG_DMA_MOD(CFG_SWAPUV);
for (i = 0; i < num_planes; i++)
addr[i] = obj->dev_addr + fb->offsets[i] +
src_y * fb->pitches[i] +
src_x * drm_format_plane_cpp(pixel_format, i);
for (; i < ARRAY_SIZE(addr); i++)
addr[i] = 0;
armada_reg_queue_set(dplane->vbl.regs, idx, addr[0],
LCD_SPU_DMA_START_ADDR_Y0);
armada_reg_queue_set(dplane->vbl.regs, idx, su,
armada_reg_queue_set(dplane->vbl.regs, idx, addr[1],
LCD_SPU_DMA_START_ADDR_U0);
armada_reg_queue_set(dplane->vbl.regs, idx, sv,
armada_reg_queue_set(dplane->vbl.regs, idx, addr[2],
LCD_SPU_DMA_START_ADDR_V0);
armada_reg_queue_set(dplane->vbl.regs, idx, sy,
armada_reg_queue_set(dplane->vbl.regs, idx, addr[0],
LCD_SPU_DMA_START_ADDR_Y1);
armada_reg_queue_set(dplane->vbl.regs, idx, su,
armada_reg_queue_set(dplane->vbl.regs, idx, addr[1],
LCD_SPU_DMA_START_ADDR_U1);
armada_reg_queue_set(dplane->vbl.regs, idx, sv,
armada_reg_queue_set(dplane->vbl.regs, idx, addr[2],
LCD_SPU_DMA_START_ADDR_V1);
val = fb->pitches[0] << 16 | fb->pitches[0];