drm/msm/dsi: Set up runtime PM for DSI

Call the pm_runtime_get/put API where we need the clocks enabled.

The main entry/exit points are 1) enabling/disabling the DSI bridge
and 2) Sending commands from the DSI host to the device.

Signed-off-by: Archit Taneja <[e-mail]>
Signed-off-by: Rob Clark <[e-mail]>

drivers/gpu/drm/msm/dsi/dsi_host.c

···
 		goto put_gdsc;
 	}
 
+	pm_runtime_get_sync(dev);
+
 	ret = regulator_enable(gdsc_reg);
 	if (ret) {
 		pr_err("%s: unable to enable gdsc\n", __func__);
···
 	clk_disable_unprepare(ahb_clk);
 disable_gdsc:
 	regulator_disable(gdsc_reg);
+	pm_runtime_put_autosuspend(dev);
 put_clk:
 	clk_put(ahb_clk);
 put_gdsc:
···
 		goto fail;
 	}
 
+	pm_runtime_enable(&pdev->dev);
+
 	msm_host->cfg_hnd = dsi_get_config(msm_host);
 	if (!msm_host->cfg_hnd) {
 		ret = -EINVAL;
···
 	mutex_destroy(&msm_host->clk_mutex);
 	mutex_destroy(&msm_host->cmd_mutex);
 	mutex_destroy(&msm_host->dev_mutex);
+
+	pm_runtime_disable(&msm_host->pdev->dev);
 }
 
 int msm_dsi_host_modeset_init(struct mipi_dsi_host *host,
···
 	 * mdss interrupt is generated in mdp core clock domain
 	 * mdp clock need to be enabled to receive dsi interrupt
 	 */
+	pm_runtime_get_sync(&msm_host->pdev->dev);
 	dsi_clk_ctrl(msm_host, 1);
 
 	/* TODO: vote for bus bandwidth */
···
 	/* TODO: unvote for bus bandwidth */
 
 	dsi_clk_ctrl(msm_host, 0);
+	pm_runtime_put_autosuspend(&msm_host->pdev->dev);
 }
 
 int msm_dsi_host_cmd_tx(struct mipi_dsi_host *host,
···
 		goto unlock_ret;
 	}
 
+	pm_runtime_get_sync(&msm_host->pdev->dev);
 	ret = dsi_clk_ctrl(msm_host, 1);
 	if (ret) {
 		pr_err("%s: failed to enable clocks. ret=%d\n", __func__, ret);
···
 	pinctrl_pm_select_sleep_state(&msm_host->pdev->dev);
 
 	dsi_clk_ctrl(msm_host, 0);
+	pm_runtime_put_autosuspend(&msm_host->pdev->dev);
 
 	dsi_host_regulator_disable(msm_host);
 

drivers/gpu/drm/msm/dsi/phy/dsi_phy.c

···
 static void dsi_phy_disable_resource(struct msm_dsi_phy *phy)
 {
 	clk_disable_unprepare(phy->ahb_clk);
-	pm_runtime_put_sync(&phy->pdev->dev);
+	pm_runtime_put_autosuspend(&phy->pdev->dev);
 }
 
 static const struct of_device_id dsi_phy_dt_match[] = {