Hi,
On Tue, Jul 22, 2025 at 04:41:12PM +0200, Otto Pflüger wrote:
> 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.pflue...@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
> e01d1d28fe579644ec2e0c83ec9170269932adfe..2af4273a6c73185084290c9d14b8ac18914d514b
> 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;
> }I'm a bit confused. Why do you need to enable / disable that clock in pre_enable / post_disable, if you already enabled it at probe? Maxime
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