[PATCH 4/7] drm/rockchip: dw-mipi: add dw-mipi power domain support

[Chris Zhong]

Reference the power domain incase dw-mipi power down when
in use.

Signed-off-by: Chris Zhong <zyw at rock-chips.com>
---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c 
b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 100da01..15ba796 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -12,6 +12,7 @@
 #include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>
 #include <drm/drm_atomic_helper.h>
@@ -293,6 +294,7 @@ struct dw_mipi_dsi {
        struct clk *pclk;
        struct clk *phy_cfg_clk;

+       int dpms_mode;
        unsigned int lane_mbps; /* per lane */
        u32 channel;
        u32 lanes;
@@ -844,6 +846,11 @@ static void dw_mipi_dsi_encoder_mode_set(struct 
drm_encoder *encoder,
        struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);
        int ret;

+       if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
+               return;
+
+       pm_runtime_get_sync(dsi->dev);
+
        dsi->mode = adjusted_mode;

        ret = dw_mipi_dsi_get_lane_bps(dsi);
@@ -876,6 +883,9 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder 
*encoder)
 {
        struct dw_mipi_dsi *dsi = encoder_to_dsi(encoder);

+       if (dsi->dpms_mode != DRM_MODE_DPMS_ON)
+               return;
+
        drm_panel_disable(dsi->panel);

        if (clk_prepare_enable(dsi->pclk)) {
@@ -896,6 +906,8 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder 
*encoder)
        dw_mipi_dsi_set_mode(dsi, DW_MIPI_DSI_CMD_MODE);
        dw_mipi_dsi_disable(dsi);
        clk_disable_unprepare(dsi->pclk);
+       pm_runtime_put(dsi->dev);
+       dsi->dpms_mode = DRM_MODE_DPMS_OFF;
 }

 static void dw_mipi_dsi_encoder_commit(struct drm_encoder *encoder)
@@ -929,6 +941,7 @@ static void dw_mipi_dsi_encoder_commit(struct drm_encoder 
*encoder)

        regmap_write(dsi->grf_regmap, pdata->grf_switch_reg, val);
        dev_dbg(dsi->dev, "vop %s output to dsi0\n", (mux) ? "LIT" : "BIG");
+       dsi->dpms_mode = DRM_MODE_DPMS_ON;
 }

 static int
@@ -1150,6 +1163,7 @@ static int dw_mipi_dsi_bind(struct device *dev, struct 
device *master,

        dsi->dev = dev;
        dsi->pdata = pdata;
+       dsi->dpms_mode = DRM_MODE_DPMS_OFF;

        ret = rockchip_mipi_parse_dt(dsi);
        if (ret)
@@ -1195,6 +1209,8 @@ static int dw_mipi_dsi_bind(struct device *dev, struct 
device *master,

        dev_set_drvdata(dev, dsi);

+       pm_runtime_enable(dev);
+
        dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
        dsi->dsi_host.dev = dev;
        return mipi_dsi_host_register(&dsi->dsi_host);
@@ -1210,6 +1226,7 @@ static void dw_mipi_dsi_unbind(struct device *dev, struct 
device *master,
        struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);

        mipi_dsi_host_unregister(&dsi->dsi_host);
+       pm_runtime_disable(dev);
        clk_disable_unprepare(dsi->pllref_clk);
 }

-- 
2.6.3