[PATCH v3 11/16] drm: sprd: add clock gating support
Otto Pflüger
otto.pflueger at abscue.de
Thu Jul 31 15:51:24 UTC 2025
Enable the DPU and DSI 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 | 9 +++++++++
drivers/gpu/drm/sprd/sprd_dsi.h | 4 +++-
4 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c
index 0d9eb778794d92418b39f8535d94abde3566de43..9d274600e6a80bdfc435f6c6eff77c9dd71cb38c 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, "core");
+ if (IS_ERR(ctx->clk)) {
+ dev_err(dev, "failed to get DPU core 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 071313b605447525326f6b869bc09991d4fcd691..0edb626eb35a7eeb759c2a2f5b8428cd3b092d1f 100644
--- a/drivers/gpu/drm/sprd/sprd_dsi.c
+++ b/drivers/gpu/drm/sprd/sprd_dsi.c
@@ -832,6 +832,8 @@ 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);
+
sprd_dsi_init(ctx);
if (ctx->work_mode == DSI_MODE_VIDEO)
sprd_dsi_dpi_video(ctx);
@@ -886,6 +888,8 @@ static void sprd_dsi_bridge_post_disable(struct drm_bridge *bridge)
sprd_dphy_fini(ctx);
sprd_dsi_fini(ctx);
+
+ clk_disable_unprepare(ctx->clk);
}
static const struct drm_bridge_funcs sprd_dsi_bridge_funcs = {
@@ -1109,6 +1113,11 @@ static int sprd_dsi_probe(struct platform_device *pdev)
if (!dsi->ctx.pll.platform)
return -EINVAL;
+ dsi->ctx.clk = devm_clk_get_optional(dev, "pclk");
+ if (IS_ERR(dsi->ctx.clk))
+ return dev_err_probe(dev, PTR_ERR(dsi->ctx.clk),
+ "failed to get pclk\n");
+
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 1aa609b1da33601217941390673553552f2923b1..14d06236087255f15b2704a0aff2589889fda5e9 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>
@@ -93,6 +94,7 @@ struct dphy_pll {
struct dsi_context {
void __iomem *base;
struct regmap *regmap;
+ struct clk *clk;
struct dphy_pll pll;
struct videomode vm;
--
2.50.0
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