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Message-ID: <CANAwSgR8i2BbNkQtDXTWi+kOfWtxwHe9E=sLa_8ZSU2bvTO-Yg@mail.gmail.com>
Date: Thu, 22 Aug 2024 11:02:16 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Rong Qianfeng <rongqianfeng@...o.com>
Cc: Stefan Agner <stefan@...er.ch>, Alison Wang <alison.wang@....com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-sunxi@...ts.linux.dev, opensource.kernel@...o.com
Subject: Re: [PATCH] gpu: drm: Use devm_clk_get_enabled() helpers
Hi Rong,
On Tue, 20 Aug 2024 at 18:30, Rong Qianfeng <rongqianfeng@...o.com> wrote:
>
> Replace devm_clk_get() and clk_prepare_enable() with
> devm_clk_get_enabled() that also disables and unprepares it on
> driver detach.
>
> Signed-off-by: Rong Qianfeng <rongqianfeng@...o.com>
> ---
> drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 13 +++----------
> drivers/gpu/drm/sun4i/sun6i_drc.c | 15 ++++-----------
> drivers/gpu/drm/sun4i/sun8i_mixer.c | 13 +++----------
> 3 files changed, 10 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> index ab6c0c6cd0e2..057dceaf079e 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -284,16 +284,11 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
> return PTR_ERR(fsl_dev->regmap);
> }
>
> - fsl_dev->clk = devm_clk_get(dev, "dcu");
> + fsl_dev->clk = devm_clk_get_enabled(dev, "dcu");
> if (IS_ERR(fsl_dev->clk)) {
> dev_err(dev, "failed to get dcu clock\n");
> return PTR_ERR(fsl_dev->clk);
You can use dev_err_probe it will be fine in all cases for clocks.to
get enabled.
return dev_err_probe(dev, PTR_ERR(fsl_dev->clk),
"failed to get duc clock\n");
Thanks
-Anand
> }
> - ret = clk_prepare_enable(fsl_dev->clk);
> - if (ret < 0) {
> - dev_err(dev, "failed to enable dcu clk\n");
> - return ret;
> - }
>
> pix_clk_in = devm_clk_get(dev, "pix");
> if (IS_ERR(pix_clk_in)) {
> @@ -311,8 +306,7 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
> div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
> if (IS_ERR(fsl_dev->pix_clk)) {
> dev_err(dev, "failed to register pix clk\n");
> - ret = PTR_ERR(fsl_dev->pix_clk);
> - goto disable_clk;
> + return PTR_ERR(fsl_dev->pix_clk);
> }
>
> fsl_dev->tcon = fsl_tcon_init(dev);
> @@ -341,8 +335,7 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
> drm_dev_put(drm);
> unregister_pix_clk:
> clk_unregister(fsl_dev->pix_clk);
> -disable_clk:
> - clk_disable_unprepare(fsl_dev->clk);
> +
> return ret;
> }
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_drc.c b/drivers/gpu/drm/sun4i/sun6i_drc.c
> index 0d342f43fa93..f263ad282828 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_drc.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_drc.c
> @@ -42,33 +42,28 @@ static int sun6i_drc_bind(struct device *dev, struct device *master,
> return ret;
> }
>
> - drc->bus_clk = devm_clk_get(dev, "ahb");
> + drc->bus_clk = devm_clk_get_enabled(dev, "ahb");
> if (IS_ERR(drc->bus_clk)) {
> dev_err(dev, "Couldn't get our bus clock\n");
> ret = PTR_ERR(drc->bus_clk);
> goto err_assert_reset;
> }
> - clk_prepare_enable(drc->bus_clk);
>
> - drc->mod_clk = devm_clk_get(dev, "mod");
> + drc->mod_clk = devm_clk_get_enabled(dev, "mod");
> if (IS_ERR(drc->mod_clk)) {
> dev_err(dev, "Couldn't get our mod clock\n");
> ret = PTR_ERR(drc->mod_clk);
> - goto err_disable_bus_clk;
> + goto err_assert_reset;
> }
>
> ret = clk_set_rate_exclusive(drc->mod_clk, 300000000);
> if (ret) {
> dev_err(dev, "Couldn't set the module clock frequency\n");
> - goto err_disable_bus_clk;
> + goto err_assert_reset;
> }
>
> - clk_prepare_enable(drc->mod_clk);
> -
> return 0;
>
> -err_disable_bus_clk:
> - clk_disable_unprepare(drc->bus_clk);
> err_assert_reset:
> reset_control_assert(drc->reset);
> return ret;
> @@ -80,8 +75,6 @@ static void sun6i_drc_unbind(struct device *dev, struct device *master,
> struct sun6i_drc *drc = dev_get_drvdata(dev);
>
> clk_rate_exclusive_put(drc->mod_clk);
> - clk_disable_unprepare(drc->mod_clk);
> - clk_disable_unprepare(drc->bus_clk);
> reset_control_assert(drc->reset);
> }
>
> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> index bd0fe2c6624e..ebf00676a76d 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> @@ -507,19 +507,18 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
> return ret;
> }
>
> - mixer->bus_clk = devm_clk_get(dev, "bus");
> + mixer->bus_clk = devm_clk_get_enabled(dev, "bus");
> if (IS_ERR(mixer->bus_clk)) {
> dev_err(dev, "Couldn't get the mixer bus clock\n");
> ret = PTR_ERR(mixer->bus_clk);
> goto err_assert_reset;
> }
> - clk_prepare_enable(mixer->bus_clk);
>
> - mixer->mod_clk = devm_clk_get(dev, "mod");
> + mixer->mod_clk = devm_clk_get_enabled(dev, "mod");
> if (IS_ERR(mixer->mod_clk)) {
> dev_err(dev, "Couldn't get the mixer module clock\n");
> ret = PTR_ERR(mixer->mod_clk);
> - goto err_disable_bus_clk;
> + goto err_assert_reset;
> }
>
> /*
> @@ -530,8 +529,6 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
> if (mixer->cfg->mod_rate)
> clk_set_rate(mixer->mod_clk, mixer->cfg->mod_rate);
>
> - clk_prepare_enable(mixer->mod_clk);
> -
> list_add_tail(&mixer->engine.list, &drv->engine_list);
>
> base = sun8i_blender_base(mixer);
> @@ -592,8 +589,6 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
>
> return 0;
>
> -err_disable_bus_clk:
> - clk_disable_unprepare(mixer->bus_clk);
> err_assert_reset:
> reset_control_assert(mixer->reset);
> return ret;
> @@ -606,8 +601,6 @@ static void sun8i_mixer_unbind(struct device *dev, struct device *master,
>
> list_del(&mixer->engine.list);
>
> - clk_disable_unprepare(mixer->mod_clk);
> - clk_disable_unprepare(mixer->bus_clk);
> reset_control_assert(mixer->reset);
> }
>
> --
> 2.39.0
>
>
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