MLK-11162 video: mipi_dsi_samsung: add runtime pm for mipi phy

Using runtime pm framework to control the mipi
phy on/off dynamically.

Signed-off-by: Fancy Fang <chen.fang@freescale.com>
(cherry picked from commit 0dcb155067e95d8cdb0030584a2157034cae4701)

Conflicts:
	drivers/video/mxc/mipi_dsi_samsung.c

diff --git a/drivers/video/fbdev/mxc/mipi_dsi_samsung.c b/drivers/video/fbdev/mxc/mipi_dsi_samsung.c
index a9acc9d..6e4be5b 100644 (file)
--- a/drivers/video/fbdev/mxc/mipi_dsi_samsung.c
+++ b/drivers/video/fbdev/mxc/mipi_dsi_samsung.c
@@ -29,6 +29,8 @@
 #include <linux/mipi_dsi_samsung.h>
 #include <linux/module.h>
 #include <linux/mxcfb.h>
+#include <linux/pm_runtime.h>
+#include <linux/busfreq-imx.h>
 #include <linux/backlight.h>
 #include <linux/of_device.h>
 #include <linux/of_address.h>
@@ -550,8 +552,8 @@ static int mipi_dsi_enable(struct mxc_dispdrv_handle *disp,
                msleep(120);
        }
 
-       /* power on dphy */
-       mipi_dsi_dphy_power_on(mipi_dsi->pdev);
+       if (!mipi_dsi->dsi_power_on)
+               pm_runtime_get_sync(&mipi_dsi->pdev->dev);
 
        ret = clk_prepare_enable(mipi_dsi->dphy_clk);
        ret |= clk_prepare_enable(mipi_dsi->cfg_clk);
@@ -603,7 +605,11 @@ static void mipi_dsi_disable(struct mxc_dispdrv_handle *disp,
        mipi_dsi_power_off(mipi_dsi->disp_mipi);
 
        if (fbi->state == FBINFO_STATE_SUSPENDED) {
-               mipi_dsi_dphy_power_down();
+               if (mipi_dsi->dsi_power_on) {
+                       pm_runtime_put_noidle(&mipi_dsi->pdev->dev);
+                       pm_runtime_put_sync_suspend(&mipi_dsi->pdev->dev);
+                       pm_runtime_get_noresume(&mipi_dsi->pdev->dev);
+               }
 
                if (mipi_dsi->disp_power_on)
                        regulator_disable(mipi_dsi->disp_power_on);
@@ -789,6 +795,8 @@ static int mipi_dsi_probe(struct platform_device *pdev)
                goto dispdrv_reg_fail;
        }
 
+       pm_runtime_enable(&pdev->dev);
+
        mxc_dispdrv_setdata(mipi_dsi->disp_mipi, mipi_dsi);
        dev_set_drvdata(&pdev->dev, mipi_dsi);
 
@@ -829,10 +837,49 @@ static int mipi_dsi_remove(struct platform_device *pdev)
        return 0;
 }
 
+static int mipi_dsi_runtime_suspend(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct mipi_dsi_info *mipi_dsi = dev_get_drvdata(&pdev->dev);
+
+       if (mipi_dsi->dsi_power_on) {
+               release_bus_freq(BUS_FREQ_HIGH);
+               dev_dbg(dev, "mipi dsi busfreq high release.\n");
+
+               mipi_dsi_dphy_power_down();
+               mipi_dsi->dsi_power_on = 0;
+       }
+
+       return 0;
+}
+
+static int mipi_dsi_runtime_resume(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct mipi_dsi_info *mipi_dsi = dev_get_drvdata(&pdev->dev);
+
+       if (!mipi_dsi->dsi_power_on) {
+               request_bus_freq(BUS_FREQ_HIGH);
+               dev_dbg(dev, "mipi dsi busfreq high request.\n");
+
+               mipi_dsi_dphy_power_on(pdev);
+               mipi_dsi->dsi_power_on = 1;
+       }
+
+       return 0;
+}
+
+static const struct dev_pm_ops mipi_dsi_pm_ops = {
+       .runtime_suspend = mipi_dsi_runtime_suspend,
+       .runtime_resume  = mipi_dsi_runtime_resume,
+       .runtime_idle    = NULL,
+};
+
 static struct platform_driver mipi_dsi_driver = {
        .driver = {
                   .of_match_table = imx_mipi_dsi_dt_ids,
                   .name = "mxc_mipi_dsi_samsung",
+                  .pm = &mipi_dsi_pm_ops,
        },
        .probe  = mipi_dsi_probe,
        .remove = mipi_dsi_remove,