[PATCH 08/12] drm: sprd: add gate clock support

[Otto Pflüger]

Enable the DPU and DSI gate clocks specified in the device tree.
Disable the DSI clock when it is not needed.

Signed-off-by: Otto Pflüger <otto.pflueger at abscue.de>
---
 drivers/gpu/drm/sprd/sprd_dpu.c |  7 +++++++
 drivers/gpu/drm/sprd/sprd_dpu.h |  1 +
 drivers/gpu/drm/sprd/sprd_dsi.c | 10 ++++++++++
 drivers/gpu/drm/sprd/sprd_dsi.h |  4 +++-
 4 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c
index 0d9eb778794d92418b39f8535d94abde3566de43..575bcdb0e0bb30055ac5c3d0e65178cc9f6611f3 100644
--- a/drivers/gpu/drm/sprd/sprd_dpu.c
+++ b/drivers/gpu/drm/sprd/sprd_dpu.c
@@ -3,6 +3,7 @@
  * Copyright (C) 2020 Unisoc Inc.
  */
 
+#include <linux/clk.h>
 #include <linux/component.h>
 #include <linux/delay.h>
 #include <linux/dma-buf.h>
@@ -794,6 +795,12 @@ static int sprd_dpu_context_init(struct sprd_dpu *dpu,
 	if (ctx->irq < 0)
 		return ctx->irq;
 
+	ctx->clk = devm_clk_get_optional_enabled(dev, "enable");
+	if (IS_ERR(ctx->clk)) {
+		dev_err(dev, "failed to get dpu enable clock\n");
+		return PTR_ERR(ctx->clk);
+	}
+
 	/* disable and clear interrupts before register dpu IRQ. */
 	writel(0x00, ctx->base + REG_DPU_INT_EN);
 	writel(0xff, ctx->base + REG_DPU_INT_CLR);
diff --git a/drivers/gpu/drm/sprd/sprd_dpu.h b/drivers/gpu/drm/sprd/sprd_dpu.h
index 157a78f24dc18b071602552ea9d005af66525263..d48b922de580a8a4bf07c4610c431d3321f7b810 100644
--- a/drivers/gpu/drm/sprd/sprd_dpu.h
+++ b/drivers/gpu/drm/sprd/sprd_dpu.h
@@ -44,6 +44,7 @@ enum {
  */
 struct dpu_context {
 	void __iomem *base;
+	struct clk *clk;
 	int irq;
 	u8 if_type;
 	struct videomode vm;
diff --git a/drivers/gpu/drm/sprd/sprd_dsi.c b/drivers/gpu/drm/sprd/sprd_dsi.c
index e01d1d28fe579644ec2e0c83ec9170269932adfe..e781e6c84860402f37352e768244d88ca6ffd4c9 100644
--- a/drivers/gpu/drm/sprd/sprd_dsi.c
+++ b/drivers/gpu/drm/sprd/sprd_dsi.c
@@ -828,6 +828,8 @@ static void sprd_dsi_bridge_pre_enable(struct drm_bridge *bridge)
 	struct sprd_dsi *dsi = bridge_to_dsi(bridge);
 	struct dsi_context *ctx = &dsi->ctx;
 
+	clk_prepare_enable(ctx->clk);
+
 	if (ctx->enabled) {
 		drm_warn(dsi->drm, "dsi is initialized\n");
 		return;
@@ -875,6 +877,8 @@ static void sprd_dsi_bridge_post_disable(struct drm_bridge *bridge)
 	sprd_dphy_fini(ctx);
 	sprd_dsi_fini(ctx);
 
+	clk_disable_unprepare(ctx->clk);
+
 	ctx->enabled = false;
 }
 
@@ -1098,6 +1102,12 @@ static int sprd_dsi_probe(struct platform_device *pdev)
 	if (!dsi->ctx.pll.platform)
 		return -EINVAL;
 
+	dsi->ctx.clk = devm_clk_get_optional(dev, "enable");
+	if (IS_ERR(dsi->ctx.clk)) {
+		dev_err(dev, "failed to get dsi enable clock\n");
+		return PTR_ERR(dsi->ctx.clk);
+	}
+
 	return mipi_dsi_host_register(&dsi->host);
 }
 
diff --git a/drivers/gpu/drm/sprd/sprd_dsi.h b/drivers/gpu/drm/sprd/sprd_dsi.h
index 0b9f1cabe71570743cbc68a8061e95a249f27191..15e57f3f49f8e5c4f856fb496a0c88f1b0414ced 100644
--- a/drivers/gpu/drm/sprd/sprd_dsi.h
+++ b/drivers/gpu/drm/sprd/sprd_dsi.h
@@ -6,8 +6,9 @@
 #ifndef __SPRD_DSI_H__
 #define __SPRD_DSI_H__
 
-#include <linux/of.h>
+#include <linux/clk.h>
 #include <linux/device.h>
+#include <linux/of.h>
 #include <linux/regmap.h>
 #include <video/videomode.h>
 
@@ -95,6 +96,7 @@ struct dphy_pll {
 struct dsi_context {
 	void __iomem *base;
 	struct regmap *regmap;
+	struct clk *clk;
 	struct dphy_pll pll;
 	struct videomode vm;
 	bool enabled;

-- 
2.50.0