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header.from=cherry.de; Received: from AS8PR04MB8897.eurprd04.prod.outlook.com (2603:10a6:20b:42c::20) by AS8PR04MB9175.eurprd04.prod.outlook.com (2603:10a6:20b:44a::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8489.22; Fri, 28 Feb 2025 17:19:55 +0000 Received: from AS8PR04MB8897.eurprd04.prod.outlook.com ([fe80::35f6:bc7d:633:369a]) by AS8PR04MB8897.eurprd04.prod.outlook.com ([fe80::35f6:bc7d:633:369a%6]) with mapi id 15.20.8489.021; Fri, 28 Feb 2025 17:19:55 +0000 Message-ID: <521cb717-68a4-43ce-84fa-580fcd8cd50b@cherry.de> Date: Fri, 28 Feb 2025 18:19:54 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] drm/rockchip: lvds: move pclk preparation in with clk_get To: Heiko Stuebner Cc: andy.yan@rock-chips.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, 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AS8PR04MB9175 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250228_091958_885384_A4043284 X-CRM114-Status: GOOD ( 20.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Heiko, On 2/28/25 5:57 PM, Heiko Stuebner wrote: > From: Heiko Stuebner > > The LVDS block needs a separate pclk only on some socs, so currently > requests and prepares it in the soc-specific probe function, but common > code is required to unprepare it in the error path or on driver remove. > > While this works because clk_unprepare just does nothing if clk is NULL, > this mismatch of who is responsible still is not very nice. > The clock-framework already has a helper for clk-get-and-prepare even > with devres support in devm_clk_get_prepared(). > > This will get and prepare the clock and also unprepare it on driver > removal, saving the driver from having to handle it "manually". > > Signed-off-by: Heiko Stuebner Reviewed-by: Quentin Schulz Small nitpick below. > --- > drivers/gpu/drm/rockchip/rockchip_lvds.c | 17 ++--------------- > 1 file changed, 2 insertions(+), 15 deletions(-) > > diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c > index 385cf6881504..c19b7b1f6cb5 100644 > --- a/drivers/gpu/drm/rockchip/rockchip_lvds.c > +++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c > @@ -448,13 +448,11 @@ struct drm_encoder_helper_funcs px30_lvds_encoder_helper_funcs = { > static int rk3288_lvds_probe(struct platform_device *pdev, > struct rockchip_lvds *lvds) > { > - int ret; > - > lvds->regs = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(lvds->regs)) > return PTR_ERR(lvds->regs); > > - lvds->pclk = devm_clk_get(lvds->dev, "pclk_lvds"); > + lvds->pclk = devm_clk_get_prepared(lvds->dev, "pclk_lvds"); > if (IS_ERR(lvds->pclk)) { > DRM_DEV_ERROR(lvds->dev, "could not get pclk_lvds\n"); Should we say Could not get or prepare pclk_lvds\n instead? Thanks! Quentin