linux-kernel - Re: [PATCH 9/9] drm/verisilicon: Add starfive hdmi driver

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Date:   Mon, 5 Jun 2023 10:08:48 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Keith Zhao <keith.zhao@...rfivetech.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        christian.koenig@....com, Bjorn Andersson <andersson@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Shawn Guo <shawnguo@...nel.org>, Jagan Teki <jagan@...eble.ai>,
        Chris Morgan <macromorgan@...mail.com>,
        Jack Zhu <jack.zhu@...rfivetech.com>,
        Shengyang Chen <shengyang.chen@...rfivetech.com>,
        Changhuang Liang <changhuang.liang@...rfivetech.com>
Subject: Re: [PATCH 9/9] drm/verisilicon: Add starfive hdmi driver

Hi Keith,

On Fri, Jun 02, 2023 at 03:40:43PM +0800, Keith Zhao wrote:
> Add HDMI dirver for StarFive SoC JH7110.
> 
> Signed-off-by: Keith Zhao <keith.zhao@...rfivetech.com>
> ---
>  drivers/gpu/drm/verisilicon/Kconfig         |  11 +
>  drivers/gpu/drm/verisilicon/Makefile        |   1 +
>  drivers/gpu/drm/verisilicon/starfive_hdmi.c | 928 ++++++++++++++++++++
>  drivers/gpu/drm/verisilicon/starfive_hdmi.h | 296 +++++++
>  drivers/gpu/drm/verisilicon/vs_drv.c        |   6 +
>  drivers/gpu/drm/verisilicon/vs_drv.h        |   4 +
>  6 files changed, 1246 insertions(+)
>  create mode 100644 drivers/gpu/drm/verisilicon/starfive_hdmi.c
>  create mode 100644 drivers/gpu/drm/verisilicon/starfive_hdmi.h
> 
[...]
> diff --git a/drivers/gpu/drm/verisilicon/starfive_hdmi.c b/drivers/gpu/drm/verisilicon/starfive_hdmi.c
> new file mode 100644
> index 000000000000..128ecca03309
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/starfive_hdmi.c
> @@ -0,0 +1,928 @@
[...]
> +static int starfive_hdmi_enable_clk_deassert_rst(struct device *dev, struct starfive_hdmi *hdmi)
> +{
> +	int ret;
> +
> +	ret = clk_prepare_enable(hdmi->sys_clk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "Cannot enable HDMI sys clock: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(hdmi->mclk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "Cannot enable HDMI mclk clock: %d\n", ret);
> +		return ret;
> +	}
> +	ret = clk_prepare_enable(hdmi->bclk);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "Cannot enable HDMI bclk clock: %d\n", ret);
> +		return ret;
> +	}
> +	ret = reset_control_deassert(hdmi->tx_rst);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to deassert tx_rst\n");

The error paths should clk_disable_unprepare() enabled clocks.

> +		return ret;
> +	}
> +	return 0;
> +}
> +
[...]
> +static int starfive_hdmi_get_clk_rst(struct device *dev, struct starfive_hdmi *hdmi)
> +{
> +	hdmi->sys_clk = devm_clk_get(dev, "sysclk");
> +	if (IS_ERR(hdmi->sys_clk)) {
> +		DRM_DEV_ERROR(dev, "Unable to get HDMI sysclk clk\n");
> +		return PTR_ERR(hdmi->sys_clk);
> +	}
> +	hdmi->mclk = devm_clk_get(dev, "mclk");
> +	if (IS_ERR(hdmi->mclk)) {
> +		DRM_DEV_ERROR(dev, "Unable to get HDMI mclk clk\n");
> +		return PTR_ERR(hdmi->mclk);
> +	}
> +	hdmi->bclk = devm_clk_get(dev, "bclk");
> +	if (IS_ERR(hdmi->bclk)) {
> +		DRM_DEV_ERROR(dev, "Unable to get HDMI bclk clk\n");
> +		return PTR_ERR(hdmi->bclk);
> +	}
> +	hdmi->tx_rst = reset_control_get_shared(dev, "hdmi_tx");

Use devm_reset_control_get_shared() for consistency, otherwise this is missing
a reset_control_put() somewhere.

regards
Philipp