[RESEND PATCH v7 7/7] drm/rockchip/dsi: add dw-mipi power domain support

Chris Zhong
2017-02-20T08:03:22Z

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

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
---

Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None

drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index a653384..b32e4fc 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/reset.h>
#include <linux/mfd/syscon.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;
@@ -960,6 +962,9 @@ 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;
+
if (clk_prepare_enable(dsi->pclk)) {
dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
return;
@@ -971,7 +976,9 @@ static void dw_mipi_dsi_encoder_disable(struct drm_encoder *encoder)
drm_panel_unprepare(dsi->panel);

dw_mipi_dsi_disable(dsi);
+ pm_runtime_put(dsi->dev);
clk_disable_unprepare(dsi->pclk);
+ dsi->dpms_mode = DRM_MODE_DPMS_OFF;
}

static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
@@ -987,11 +994,15 @@ static void dw_mipi_dsi_encoder_enable(struct drm_encoder *encoder)
if (ret < 0)
return;

+ if (dsi->dpms_mode == DRM_MODE_DPMS_ON)
+ return;
+
if (clk_prepare_enable(dsi->pclk)) {
dev_err(dsi->dev, "%s: Failed to enable pclk\n", __func__);
return;
}

+ pm_runtime_get_sync(dsi->dev);
dw_mipi_dsi_init(dsi);
dw_mipi_dsi_dpi_config(dsi, mode);
dw_mipi_dsi_packet_handler_config(dsi);
@@ -1027,6 +1038,7 @@ static void dw_mipi_dsi_encoder_enable(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
@@ -1194,6 +1206,7 @@ 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)
@@ -1274,6 +1287,8 @@ 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;
ret = mipi_dsi_host_register(&dsi->dsi_host);
@@ -1296,6 +1311,7 @@ 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