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drm/tegra: dc - Add YUYV support 

YUYV is UYVY with swapped bytes. Luckily the Tegra DC hardware can swap
bytes during scan-out, so supporting YUYV is simply a matter of writing
the correct value to the byteswap register.

This patch modifies tegra_dc_format() to return the byte swap parameter
via an output parameter in addition to returning the pixel format. Many
other formats can potentially be supported in a similar way.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-01-29 20:31:17 +01:00
parent 688c59afbf
commit f925390efc
2 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/gpu/drm/tegra/dc.c
View File

@ -49,7 +49,7 @@ static int tegra_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
window.dst.y = crtc_y;
window.dst.w = crtc_w;
window.dst.h = crtc_h;
window.format = tegra_dc_format(fb->pixel_format);
window.format = tegra_dc_format(fb->pixel_format, &window.swap);
window.bits_per_pixel = fb->bits_per_pixel;
window.bottom_up = tegra_fb_is_bottom_up(fb);
window.tiled = tegra_fb_is_tiled(fb);
@ -117,6 +117,7 @@ static const uint32_t plane_formats[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_RGB565,
DRM_FORMAT_UYVY,
DRM_FORMAT_YUYV,
DRM_FORMAT_YUV420,
DRM_FORMAT_YUV422,
};
@ -150,9 +151,9 @@ static int tegra_dc_add_planes(struct drm_device *drm, struct tegra_dc *dc)
static int tegra_dc_set_base(struct tegra_dc *dc, int x, int y,
struct drm_framebuffer *fb)
{
unsigned int format = tegra_dc_format(fb->pixel_format);
struct tegra_bo *bo = tegra_fb_get_plane(fb, 0);
unsigned int h_offset = 0, v_offset = 0;
unsigned int format, swap;
unsigned long value;
tegra_dc_writel(dc, WINDOW_A_SELECT, DC_CMD_DISPLAY_WINDOW_HEADER);
@ -162,7 +163,10 @@ static int tegra_dc_set_base(struct tegra_dc *dc, int x, int y,
tegra_dc_writel(dc, bo->paddr + value, DC_WINBUF_START_ADDR);
tegra_dc_writel(dc, fb->pitches[0], DC_WIN_LINE_STRIDE);
format = tegra_dc_format(fb->pixel_format, &swap);
tegra_dc_writel(dc, format, DC_WIN_COLOR_DEPTH);
tegra_dc_writel(dc, swap, DC_WIN_BYTE_SWAP);
if (tegra_fb_is_tiled(fb)) {
value = DC_WIN_BUFFER_ADDR_MODE_TILE_UV |
@ -490,7 +494,7 @@ int tegra_dc_setup_window(struct tegra_dc *dc, unsigned int index,
tegra_dc_writel(dc, value, DC_CMD_DISPLAY_WINDOW_HEADER);
tegra_dc_writel(dc, window->format, DC_WIN_COLOR_DEPTH);
tegra_dc_writel(dc, 0, DC_WIN_BYTE_SWAP);
tegra_dc_writel(dc, window->swap, DC_WIN_BYTE_SWAP);
value = V_POSITION(window->dst.y) | H_POSITION(window->dst.x);
tegra_dc_writel(dc, value, DC_WIN_POSITION);
@ -611,8 +615,12 @@ int tegra_dc_setup_window(struct tegra_dc *dc, unsigned int index,
return 0;
}
unsigned int tegra_dc_format(uint32_t format)
unsigned int tegra_dc_format(uint32_t format, uint32_t *swap)
{
/* assume no swapping of fetched data */
if (swap)
*swap = BYTE_SWAP_NOSWAP;
switch (format) {
case DRM_FORMAT_XBGR8888:
return WIN_COLOR_DEPTH_R8G8B8A8;
@ -626,6 +634,12 @@ unsigned int tegra_dc_format(uint32_t format)
case DRM_FORMAT_UYVY:
return WIN_COLOR_DEPTH_YCbCr422;
case DRM_FORMAT_YUYV:
if (swap)
*swap = BYTE_SWAP_SWAP2;
return WIN_COLOR_DEPTH_YCbCr422;
case DRM_FORMAT_YUV420:
return WIN_COLOR_DEPTH_YCbCr420P;
@ -682,7 +696,8 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc,
window.dst.y = 0;
window.dst.w = mode->hdisplay;
window.dst.h = mode->vdisplay;
window.format = tegra_dc_format(crtc->primary->fb->pixel_format);
window.format = tegra_dc_format(crtc->primary->fb->pixel_format,
&window.swap);
window.bits_per_pixel = crtc->primary->fb->bits_per_pixel;
window.stride[0] = crtc->primary->fb->pitches[0];
window.base[0] = bo->paddr;

3
drivers/gpu/drm/tegra/drm.h
View File

@ -156,6 +156,7 @@ struct tegra_dc_window {
} dst;
unsigned int bits_per_pixel;
unsigned int format;
unsigned int swap;
unsigned int stride[2];
unsigned long base[3];
bool bottom_up;
@ -163,7 +164,7 @@ struct tegra_dc_window {
};
/* from dc.c */
unsigned int tegra_dc_format(uint32_t format);
unsigned int tegra_dc_format(uint32_t format, unsigned int *swap);
int tegra_dc_setup_window(struct tegra_dc *dc, unsigned int index,
const struct tegra_dc_window *window);
void tegra_dc_enable_vblank(struct tegra_dc *dc);