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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79F50C10F13 for ; Thu, 11 Apr 2019 19:03:15 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 46F3D2146F for ; Thu, 11 Apr 2019 19:03:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="NlWET5nV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 46F3D2146F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sntech.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=sSSoJb6MzL+/QWfPKgtad937GjSV+h2dfr7ZWnEQQmk=; b=NlWET5nVgIspDS PXOQcWgeQZYIzh1tSup9CaeTOfKt9r/qLwSRHEhvTPuwIfyur5mLZfEbXaF3+o9VKDZk7nMAxQXqG OTm64UHgT3iSyvMAYepZZ9X3P+pE0ngBqgSCd9niusTlM4aZsMolWrkk7YS6a4bx3Dc4YCt+9w4bu O4w77MXA9Q4C2xLQ2cGja/MZxGbN+73jgVMENxmbJq7EjcRf1juhE+Pn0NRG4EGGDZbFa9xzGVQLW xDcsiNRdVtDpPwQt4rhIbRd7ybuAQRh78wiH4x8shirwrWjvBMhxFfeLJ7T9FGmh79+9hFxOvI7mB KeP1k1Rv1dz15F7rL2Ig==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEeyg-0002XT-GN; Thu, 11 Apr 2019 19:03:14 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hEeyc-0002Wb-U1; Thu, 11 Apr 2019 19:03:12 +0000 Received: from ip5f5a6320.dynamic.kabel-deutschland.de ([95.90.99.32] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hEeyZ-0001DH-Pa; Thu, 11 Apr 2019 21:03:07 +0200 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Matthias Kaehlcke Subject: Re: [PATCH] clk: rockchip: rk3288: Limit use of USB PHY clock to USB Date: Thu, 11 Apr 2019 21:03:07 +0200 Message-ID: <3787637.WUkDPpUsF8@diego> In-Reply-To: <20190411175917.173566-1-mka@chromium.org> References: <20190411175917.173566-1-mka@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190411_120311_120868_3F0F1315 X-CRM114-Status: GOOD ( 14.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stephen Boyd , Michael Turquette , linux-kernel@vger.kernel.org, Douglas Anderson , linux-rockchip@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Matthias, Am Donnerstag, 11. April 2019, 19:59:17 CEST schrieb Matthias Kaehlcke: > The USB PHY clock can be configured as (grand) parent of uart0_sclk and > sclk_gpu. It has been observed that UART0 doesn't work reliably in high > speed mode with the PHY clock as input when certain USB devices are > plugged to the USB HOST1 port (see https://crrev.com/c/320543). > > Prefix the name of the PHY clock with a '.' in the non-USB muxes to > effectively remove the clock as input from these muxes. > > Signed-off-by: Matthias Kaehlcke > --- > drivers/clk/rockchip/clk-rk3288.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c > index 5a67b7869960..677bc5485201 100644 > --- a/drivers/clk/rockchip/clk-rk3288.c > +++ b/drivers/clk/rockchip/clk-rk3288.c > @@ -200,8 +200,8 @@ PNAME(mux_aclk_cpu_src_p) = { "cpll_aclk_cpu", "gpll_aclk_cpu" }; > PNAME(mux_pll_src_cpll_gpll_p) = { "cpll", "gpll" }; > PNAME(mux_pll_src_npll_cpll_gpll_p) = { "npll", "cpll", "gpll" }; > PNAME(mux_pll_src_cpll_gpll_npll_p) = { "cpll", "gpll", "npll" }; > -PNAME(mux_pll_src_cpll_gpll_usb480m_p) = { "cpll", "gpll", "usbphy480m_src" }; > -PNAME(mux_pll_src_cpll_gll_usb_npll_p) = { "cpll", "gpll", "usbphy480m_src", "npll" }; > +PNAME(mux_pll_src_cpll_gpll_usb480m_p) = { "cpll", "gpll", ".usbphy480m_src" }; > +PNAME(mux_pll_src_cpll_gll_usb_npll_p) = { "cpll", "gpll", ".usbphy480m_src", "npll" }; In general I like to have things like the clock-tree described fully and let the kernel handle correct sourcing ... but: As you write this seems like a systemic problem when just connecting random peripherals can create unstable clock source frequencies, so I tend to agree here ... but: Can we please find a more "talking" name for this ... because as with the above someone will find the "." and submit a fix for it ;-) . So just name it "unstable_dummy" or so? Heiko _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel