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drm/tegra: Implement .mode_set_base()

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The sequence for replacing the scanout buffer is much shorter than a
full mode change operation so implementing this callback considerably
speeds up cases where only a new framebuffer is to be scanned out.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Thierry Reding 2012-11-28 11:38:24 +01:00
parent f34bc78741
commit 23fb47404e
1 changed files with 32 additions and 0 deletions
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32
drivers/gpu/drm/tegra/dc.c
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@ -134,6 +134,29 @@ static int tegra_dc_add_planes(struct drm_device *drm, struct tegra_dc *dc)
return 0;
}
static int tegra_dc_set_base(struct tegra_dc *dc, int x, int y,
struct drm_framebuffer *fb)
{
struct drm_gem_cma_object *gem = drm_fb_cma_get_gem_obj(fb, 0);
unsigned long value;
tegra_dc_writel(dc, WINDOW_A_SELECT, DC_CMD_DISPLAY_WINDOW_HEADER);
value = fb->offsets[0] + y * fb->pitches[0] +
x * fb->bits_per_pixel / 8;
tegra_dc_writel(dc, gem->paddr + value, DC_WINBUF_START_ADDR);
tegra_dc_writel(dc, fb->pitches[0], DC_WIN_LINE_STRIDE);
value = GENERAL_UPDATE | WIN_A_UPDATE;
tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
value = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
return 0;
}
static const struct drm_crtc_funcs tegra_crtc_funcs = {
.set_config = drm_crtc_helper_set_config,
.destroy = drm_crtc_cleanup,
@ -510,6 +533,14 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc,
return 0;
}
static int tegra_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *old_fb)
{
struct tegra_dc *dc = to_tegra_dc(crtc);
return tegra_dc_set_base(dc, x, y, crtc->fb);
}
static void tegra_crtc_prepare(struct drm_crtc *crtc)
{
struct tegra_dc *dc = to_tegra_dc(crtc);
@ -589,6 +620,7 @@ static const struct drm_crtc_helper_funcs tegra_crtc_helper_funcs = {
.disable = tegra_crtc_disable,
.mode_fixup = tegra_crtc_mode_fixup,
.mode_set = tegra_crtc_mode_set,
.mode_set_base = tegra_crtc_mode_set_base,
.prepare = tegra_crtc_prepare,
.commit = tegra_crtc_commit,
.load_lut = tegra_crtc_load_lut,