Am Montag, den 14.01.2013, 17:05 +0100 schrieb Thierry Reding:
> 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@xxxxxxxxxxxxxxxxx>
Aside from the small comment:
Reviewed-by: Lucas Stach <dev@xxxxxxxxxx>
> ---
> 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);
Make this two separate writes.
> +
> + 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,
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