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Commit 23fb4740 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: Implement .mode_set_base() 



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: default avatarThierry Reding <thierry.reding@avionic-design.de>
parent f34bc787

drivers/gpu/drm/tegra/dc.c

+32 −0
Original line number Diff line number Diff line
@@ -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,