linux-kernel - Re: [PATCH v6 3/3] drm/rockchip: Add basic RK3588 HDMI output support

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Message-ID: <2376712.1SvkZsmPdQ@diego>
Date: Tue, 10 Sep 2024 21:08:26 +0200
From: Heiko Stübner <heiko@...ech.de>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.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>,
 Sandy Huang <hjc@...k-chips.com>, Andy Yan <andy.yan@...k-chips.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Mark Yao <markyao0591@...il.com>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 devicetree@...r.kernel.org, kernel@...labora.com,
 Alexandre ARNOUD <aarnoud@...com>, Luis de Arquer <ldearquer@...il.com>,
 Algea Cao <algea.cao@...k-chips.com>
Subject: Re: [PATCH v6 3/3] drm/rockchip: Add basic RK3588 HDMI output support

Am Freitag, 6. September 2024, 03:17:42 CEST schrieb Cristian Ciocaltea:
> The RK3588 SoC family integrates the newer Synopsys DesignWare HDMI 2.1
> Quad-Pixel (QP) TX controller IP and a HDMI/eDP TX Combo PHY based on a
> Samsung IP block.
> 
> Add just the basic support for now, i.e. RGB output up to 4K@...z,
> without audio, CEC or any of the HDMI 2.1 specific features.
> 
> Co-developed-by: Algea Cao <algea.cao@...k-chips.com>
> Signed-off-by: Algea Cao <algea.cao@...k-chips.com>
> Tested-by: Heiko Stuebner <heiko@...ech.de>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>

[...]

> diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
> index 3ff7b21c0414..3eab662a5a1d 100644
> --- a/drivers/gpu/drm/rockchip/Makefile
> +++ b/drivers/gpu/drm/rockchip/Makefile
> @@ -11,6 +11,7 @@ rockchipdrm-$(CONFIG_ROCKCHIP_VOP) += rockchip_drm_vop.o rockchip_vop_reg.o

> +static int dw_hdmi_qp_rockchip_bind(struct device *dev, struct device *master,
> +				    void *data)
> +{
> +	static const char * const clk_names[] = {
> +		"pclk", "earc", "aud", "hdp", "hclk_vo1",
> +		"ref" /* keep "ref" last */
> +	};

[...]

> +	for (i = 0; i < ARRAY_SIZE(clk_names); i++) {
> +		clk = devm_clk_get_enabled(hdmi->dev, clk_names[i]);
> +
> +		if (IS_ERR(clk)) {
> +			ret = PTR_ERR(clk);
> +			if (ret != -EPROBE_DEFER)
> +				drm_err(hdmi, "Failed to get %s clock: %d\n",
> +					clk_names[i], ret);
> +			return ret;
> +		}
> +	}
> +	hdmi->ref_clk = clk;

How about using devm_clk_bulk_get_all_enable() for everything except the
refclk and a separate call to devm_clk_get_enabled() for that refclk .

That hdmi->ref_clk just accidentially falls out of that loop at the end
looks somewhat strange, so getting and keeping that refclk
separately would make this look cleaner.