From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D2D3ED5C0E1 for ; Fri, 8 Nov 2024 14:59:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:Message-ID:References:In-Reply-To:Subject:Cc:To:From:Date: MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=upYsGgf23umhPBOmb5HT7kjqp65LPpB+QOD8j0l2rE4=; b=0ui/yPqOe3mRKtYzeetxg7055i 8955ODm2tl24NrBKIUHnaVeLhksC5M6EjKp9scUHEXK6dra9Kc/+v6sVhVkYKD9KA4X0KnOMjc6Ek glcXBgM4wT8tDc0Yffpp8zmwNRDWY1gvSewQMmdVdI0Dr3iEutUyGjqazxwg/phc7OL3nMEo4rD0c 1WEuKhNj13GJqjai1MF8j4+y5H4BwCwPQa9TKOzvdrHWE/QPGKqjJAlY6lZcAsa0wDJJuQ5KU8I0J s2dT8/5ay0wpr0hMvB29ec63OlQe4baKEO6iU/XRg0telE45i6prAmvDAfL7uhGhGiGm1te7f+ZyQ m4hIGutA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t9QRp-0000000Aw8g-2dS4; Fri, 08 Nov 2024 14:58:53 +0000 Received: from mail.manjaro.org ([2a01:4f8:c0c:51f3::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t9PpD-0000000ApEf-3Rko; Fri, 08 Nov 2024 14:19:01 +0000 MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=manjaro.org; s=2021; t=1731075537; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=upYsGgf23umhPBOmb5HT7kjqp65LPpB+QOD8j0l2rE4=; b=Cu67kjSVWeIMcCC+Jbh62CKfQeBvbLbaeVrOoJTC7E08ONzDAKwTyxCnm3RyphTtwkEVxz 7Wau9/7UQPCWK+ySJoG4vlhqVFRzMAEh/VWwMiZF/1PwqTKqkv5r7Xaoa1MCJdJdGKU//+ lmsJf12fwprFcVfdBv5pTh5FGelCl/UYDveT2OBScypZ2UfzdmrVq55B5XiAaCuPhnikrr sg5AUSk0Po+kPHUOE88sesoLjlepcOFGoK3+HEIAlYw9DzstYiqNJgSRhhFXYDTI7LI2eg s6zc6+jAtlJisK2L8fbwYDSy2yZy6bsw+7wCAGQAivffatli+E/rkGxXezjTDA== Date: Fri, 08 Nov 2024 15:18:57 +0100 From: Dragan Simic To: Sebastian Reichel Cc: linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org, heiko@sntech.de, hjc@rock-chips.com, andy.yan@rock-chips.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Diederik de Haas Subject: Re: [PATCH 2/2] drm/rockchip: dsi: Don't log errors on deferred dphy In-Reply-To: References: <559094275c3e41cae7c89e904341f89a1240a51a.1731073565.git.dsimic@manjaro.org> Message-ID: <599471308374b786af4dc8a6b42fea76@manjaro.org> X-Sender: dsimic@manjaro.org Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Authentication-Results: ORIGINATING; auth=pass smtp.auth=dsimic@manjaro.org smtp.mailfrom=dsimic@manjaro.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241108_061900_398431_99040399 X-CRM114-Status: GOOD ( 21.86 ) 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 Hello Sebastian, On 2024-11-08 15:08, Sebastian Reichel wrote: > On Fri, Nov 08, 2024 at 02:53:58PM +0100, Dragan Simic wrote: >> Deferred driver probing shouldn't result in errors or warnings being >> logged, >> because their presence in the kernel log provides no value and may >> actually >> cause false impression that some issues exist. Thus, let's no longer >> produce >> error messages when getting the dphy results in deferred probing. >> >> This prevents misleading error messages like the following one, which >> was >> observed on a Pine64 PineTab2, from appearing in the kernel log. To >> make >> matters worse, the following error message was observed appearing >> multiple >> times in the kernel log of a single PineTab2 boot: >> >> dw-mipi-dsi-rockchip fe060000.dsi: [drm:dw_mipi_dsi_rockchip_probe \ >> [rockchipdrm]] *ERROR* failed to get mipi dphy: -517 >> >> At the same time, make the adjusted logged message a bit more >> consistent with >> the other logged messages by capitalizing its first word. >> >> Reported-by: Diederik de Haas >> Signed-off-by: Dragan Simic >> --- > > From include/drm/drm_print.h: > > * DRM_DEV_ERROR() - Error output. > * > * NOTE: this is deprecated in favor of drm_err() or dev_err(). > > The recommended way to do this nowadays looks like this: > > return dev_err_probe(dev, PTR_ERR(dsi->phy), "Failed to get mipi > dphy"); > > That will not print anything for -EPROBE_DEFER, but capture > the reason and make it available through > /sys/kernel/debug/devices_deferred if the device never probes. Thanks for your quick response! As already discussed with Heiko, I'll move forward with implementing a complete file-level conversion. At first, I thought that a partial bugfix would be beneficial, [1] but now I agree that performing a complete file-level coversion is the way to go. [2] I've got to admit, I love seeing that DRM_DEV_ERROR() is deprecated, because I've never been a big fan of the format of the messages it produces. [1] https://lore.kernel.org/dri-devel/3734f6a5424e3537d717c587a058fc85@manjaro.org/ [2] https://lore.kernel.org/dri-devel/047164cc6e88dcbc7701cb0e28d564db@manjaro.org/ >> drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 3 ++- >> 1 file changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c >> b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c >> index f451e70efbdd..ffa7f2bc640d 100644 >> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c >> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c >> @@ -1387,7 +1387,8 @@ static int dw_mipi_dsi_rockchip_probe(struct >> platform_device *pdev) >> dsi->phy = devm_phy_optional_get(dev, "dphy"); >> if (IS_ERR(dsi->phy)) { >> ret = PTR_ERR(dsi->phy); >> - DRM_DEV_ERROR(dev, "failed to get mipi dphy: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + DRM_DEV_ERROR(dev, "Failed to get mipi dphy: %d\n", ret); >> return ret; >> } >>