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 --- drivers/gpu/drm/tegra/dc.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 157e962..8dd7d8a 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -116,6 +116,25 @@ 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 tegra_framebuffer *fb) +{ + unsigned long value; + + tegra_dc_writel(dc, WINDOW_A_SELECT, DC_CMD_DISPLAY_WINDOW_HEADER); + + value = fb->base.offsets[0] + y * fb->base.pitches[0] + + x * fb->base.bits_per_pixel / 8; + + tegra_dc_writel(dc, fb->obj->paddr + value, DC_WINBUF_START_ADDR); + + value = GENERAL_ACT_REQ | WIN_A_ACT_REQ; + value |= GENERAL_UPDATE | WIN_A_UPDATE; + 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, @@ -404,6 +423,15 @@ 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_framebuffer *fb = to_tegra_fb(crtc->fb); + struct tegra_dc *dc = to_tegra_dc(crtc); + + return tegra_dc_set_base(dc, x, y, fb); +} + static void tegra_crtc_prepare(struct drm_crtc *crtc) { struct tegra_dc *dc = to_tegra_dc(crtc); @@ -483,6 +511,7 @@ static const struct drm_crtc_helper_funcs tegra_crtc_helper_funcs = { .dpms = tegra_crtc_dpms, .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,