-static void tegra_dc_stop(struct tegra_dc *dc)
-{
- u32 value;
-
- /* stop the display controller */
- value = tegra_dc_readl(dc, DC_CMD_DISPLAY_COMMAND);
- value &= ~DISP_CTRL_MODE_MASK;
- tegra_dc_writel(dc, value, DC_CMD_DISPLAY_COMMAND);
-
- tegra_dc_commit(dc);
-}
-
-static bool tegra_dc_idle(struct tegra_dc *dc)
-{
- u32 value;
-
- value = tegra_dc_readl_active(dc, DC_CMD_DISPLAY_COMMAND);
-
- return (value & DISP_CTRL_MODE_MASK) == 0;
-}
-
-static int tegra_dc_wait_idle(struct tegra_dc *dc, unsigned long timeout)
-{
- timeout = jiffies + msecs_to_jiffies(timeout);
-
- while (time_before(jiffies, timeout)) {
- if (tegra_dc_idle(dc))
- return 0;
-
- usleep_range(1000, 2000);
- }
-
- dev_dbg(dc->dev, "timeout waiting for DC to become idle\n");
- return -ETIMEDOUT;
-}
-
-static void tegra_crtc_disable(struct drm_crtc *crtc)
-{
- struct tegra_dc *dc = to_tegra_dc(crtc);
- u32 value;
-
- if (!tegra_dc_idle(dc)) {
- tegra_dc_stop(dc);
-
- /*
- * Ignore the return value, there isn't anything useful to do
- * in case this fails.
- */
- tegra_dc_wait_idle(dc, 100);
- }
-
- /*
- * This should really be part of the RGB encoder driver, but clearing
- * these bits has the side-effect of stopping the display controller.
- * When that happens no VBLANK interrupts will be raised. At the same
- * time the encoder is disabled before the display controller, so the
- * above code is always going to timeout waiting for the controller
- * to go idle.
- *
- * Given the close coupling between the RGB encoder and the display
- * controller doing it here is still kind of okay. None of the other
- * encoder drivers require these bits to be cleared.
- *
- * XXX: Perhaps given that the display controller is switched off at
- * this point anyway maybe clearing these bits isn't even useful for
- * the RGB encoder?
- */
- if (dc->rgb) {
- value = tegra_dc_readl(dc, DC_CMD_DISPLAY_POWER_CONTROL);
- value &= ~(PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
- PW4_ENABLE | PM0_ENABLE | PM1_ENABLE);
- tegra_dc_writel(dc, value, DC_CMD_DISPLAY_POWER_CONTROL);
- }
-
- drm_crtc_vblank_off(crtc);
-}
-
-static bool tegra_crtc_mode_fixup(struct drm_crtc *crtc,
- const struct drm_display_mode *mode,
- struct drm_display_mode *adjusted)
-{
- return true;
-}
-