linux-kernel - [PATCH v6 6/6] drm/rockchip/dsi: add dw-mipi power domain support

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Message-Id: <1486520722-8853-7-git-send-email-zyw@rock-chips.com>
Date:   Wed,  8 Feb 2017 10:25:22 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     john@...anate.com, dianders@...omium.org, tfiga@...omium.org,
        heiko@...ech.de, yzq@...k-chips.com, mark.rutland@....com,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        galak@...eaurora.org, pawel.moll@....com, seanpaul@...omium.org
Cc:     linux-rockchip@...ts.infradead.org,
        Chris Zhong <zyw@...k-chips.com>,
        Mark Yao <mark.yao@...k-chips.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v6 6/6] drm/rockchip/dsi: add dw-mipi power domain support

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

Signed-off-by: Chris Zhong <zyw@...k-chips.com>
Reviewed-by: Sean Paul <seanpaul@...omium.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 a2b4ec4..2ee2317 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