Re: [PATCH v8 08/16] drm/meson: dw-hdmi: Don't open code devm_clk_get_enabled()

From: Neil Armstrong <narmstrong@baylibre.com>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Michael Turquette" <mturquette@baylibre.com>,
	"Stephen Boyd" <sboyd@kernel.org>,
	"Russell King" <linux@armlinux.org.uk>,
	"David Airlie" <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Kevin Hilman" <khilman@baylibre.com>,
	"Jerome Brunet" <jbrunet@baylibre.com>,
	"Martin Blumenstingl" <martin.blumenstingl@googlemail.com>
Cc: linux-clk@vger.kernel.org, kernel@pengutronix.de,
	dri-devel@lists.freedesktop.org,
	linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v8 08/16] drm/meson: dw-hdmi: Don't open code devm_clk_get_enabled()
Date: Wed, 16 Mar 2022 09:33:02 +0100	[thread overview]
Message-ID: <73cca4e1-c427-1fa3-52f6-18c211dd84b7@baylibre.com> (raw)
In-Reply-To: <20220314141643.22184-9-u.kleine-koenig@pengutronix.de>

On 14/03/2022 15:16, Uwe Kleine-König wrote:
> devm_clk_get_enabled() returns a clock prepared and enabled and already
> registers a devm exit handler to disable (and unprepare) the clock.
> 
> There is slight change in behavior as a failure to enable the clock
> now results in an error message, too. Also the actual error code is added
> to the message.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> ---
>   drivers/gpu/drm/meson/meson_dw_hdmi.c | 48 +++++++++------------------
>   1 file changed, 16 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> index 5cd2b2ebbbd3..6034e80c5b2e 100644
> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> @@ -670,29 +670,6 @@ static void meson_disable_regulator(void *data)
>   	regulator_disable(data);
>   }
>   
> -static void meson_disable_clk(void *data)
> -{
> -	clk_disable_unprepare(data);
> -}
> -
> -static int meson_enable_clk(struct device *dev, char *name)
> -{
> -	struct clk *clk;
> -	int ret;
> -
> -	clk = devm_clk_get(dev, name);
> -	if (IS_ERR(clk)) {
> -		dev_err(dev, "Unable to get %s pclk\n", name);
> -		return PTR_ERR(clk);
> -	}
> -
> -	ret = clk_prepare_enable(clk);
> -	if (!ret)
> -		ret = devm_add_action_or_reset(dev, meson_disable_clk, clk);
> -
> -	return ret;
> -}
> -
>   static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>   				void *data)
>   {
> @@ -702,6 +679,7 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>   	struct drm_device *drm = data;
>   	struct meson_drm *priv = drm->dev_private;
>   	struct dw_hdmi_plat_data *dw_plat_data;
> +	struct clk *clk;
>   	int irq;
>   	int ret;
>   
> @@ -763,17 +741,23 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>   	if (IS_ERR(meson_dw_hdmi->hdmitx))
>   		return PTR_ERR(meson_dw_hdmi->hdmitx);
>   
> -	ret = meson_enable_clk(dev, "isfr");
> -	if (ret)
> -		return ret;
> +	clk = devm_clk_get_enabled(dev, "isfr");
> +	if (IS_ERR(clk)) {
> +		dev_err(dev, "Failed to get enabled isfr pclk (%pe)\n", clk);
> +		return PTR_ERR(clk);
> +	}
>   
> -	ret = meson_enable_clk(dev, "iahb");
> -	if (ret)
> -		return ret;
> +	clk = devm_clk_get_enabled(dev, "iahb");
> +	if (IS_ERR(clk)) {
> +		dev_err(dev, "Failed to get enabled iahb pclk (%pe)\n", clk);
> +		return PTR_ERR(clk);
> +	}
>   
> -	ret = meson_enable_clk(dev, "venci");
> -	if (ret)
> -		return ret;
> +	clk = devm_clk_get_enabled(dev, "venci");
> +	if (IS_ERR(clk)) {
> +		dev_err(dev, "Failed to get enabled venci pclk (%pe)\n", clk);
> +		return PTR_ERR(clk);
> +	}
>   
>   	dw_plat_data->regm = devm_regmap_init(dev, NULL, meson_dw_hdmi,
>   					      &meson_dw_hdmi_regmap_config);

Acked-by: Neil Armstrong <narmstrong@baylibre.com>

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