Linux-ARM-Kernel Archive on lore.kernel.org

* [PATCH] drm/rockchip: analogix_dp: add supports for regulators in edp IP
From: Randy Li @ 2016-10-22 19:18 UTC (permalink / raw)
  To: linux-arm-kernel

I found if eDP_AVDD_1V0 and eDP_AVDD_1V8 are not been power at
RK3288, once trying to enable the pclk clock, the kernel would dead.
This patch would try to enable them first. The eDP_AVDD_1V8 more
likely to be applied to eDP phy, but I have no time to confirmed
it yet.

Signed-off-by: Randy Li <ayaka@soulik.info>
---
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 8548e82..6bf0441 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -17,6 +17,7 @@
 #include <linux/of_device.h>
 #include <linux/of_graph.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/clk.h>
 
@@ -70,6 +71,7 @@ struct rockchip_dp_device {
 	struct clk               *grfclk;
 	struct regmap            *grf;
 	struct reset_control     *rst;
+	struct regulator_bulk_data supplies[2];
 
 	struct work_struct	 psr_work;
 	spinlock_t		 psr_lock;
@@ -146,6 +148,13 @@ static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
 
 	cancel_work_sync(&dp->psr_work);
 
+	ret = regulator_bulk_enable(ARRAY_SIZE(dp->supplies),
+			dp->supplies);
+	if (ret) {
+		dev_err(dp->dev, "failed to enable vdd supply %d\n", ret);
+		return ret;
+	}
+
 	ret = clk_prepare_enable(dp->pclk);
 	if (ret < 0) {
 		dev_err(dp->dev, "failed to enable pclk %d\n", ret);
@@ -168,6 +177,9 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 
 	clk_disable_unprepare(dp->pclk);
 
+	regulator_bulk_disable(ARRAY_SIZE(dp->supplies),
+			dp->supplies);
+
 	return 0;
 }
 
@@ -323,6 +335,19 @@ static int rockchip_dp_init(struct rockchip_dp_device *dp)
 		return PTR_ERR(dp->rst);
 	}
 
+	dp->supplies[0].supply = "vcc";
+	dp->supplies[1].supply = "vccio";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dp->supplies),
+			dp->supplies);
+	if (ret < 0) {
+		dev_err(dev, "failed to get regulators: %d\n", ret);
+	}
+	ret = regulator_bulk_enable(ARRAY_SIZE(dp->supplies),
+			dp->supplies);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable regulators: %d\n", ret);
+	}
+
 	ret = clk_prepare_enable(dp->pclk);
 	if (ret < 0) {
 		dev_err(dp->dev, "failed to enable pclk %d\n", ret);
-- 
2.7.4

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