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Wed, 30 Sep 2020 09:38:25 -0700 (PDT) Date: Wed, 30 Sep 2020 09:38:23 -0700 From: Nathan Chancellor To: Maxime Ripard Cc: Nicolas Saenz Julienne , Eric Anholt , Stefan Wahren , Tim Gover , Dave Stevenson , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Hoegeun Kwon , Chanwoo Choi , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Phil Elwell , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v5 80/80] ARM: dts: bcm2711: Enable the display pipeline Message-ID: <20200930163823.GA237050@ubuntu-m3-large-x86> References: <20200929221526.GA1370981@ubuntu-m3-large-x86> <20200930140758.gummt3umouva3wyu@gilmour.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200930140758.gummt3umouva3wyu@gilmour.lan> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 30, 2020 at 04:07:58PM +0200, Maxime Ripard wrote: > Hi Nathan, > > On Tue, Sep 29, 2020 at 03:15:26PM -0700, Nathan Chancellor wrote: > > On Thu, Sep 03, 2020 at 10:01:52AM +0200, Maxime Ripard wrote: > > > Now that all the drivers have been adjusted for it, let's bring in the > > > necessary device tree changes. > > > > > > The VEC and PV3 are left out for now, since it will require a more specific > > > clock setup. > > > > > > Reviewed-by: Dave Stevenson > > > Tested-by: Chanwoo Choi > > > Tested-by: Hoegeun Kwon > > > Tested-by: Stefan Wahren > > > Signed-off-by: Maxime Ripard > > > > Apologies if this has already been reported or have a solution but this > > patch (and presumably series) breaks output to the serial console after > > a certain point during init. On Raspbian, I see systemd startup messages > > then the output just turns into complete garbage. It looks like this > > patch is merged first in linux-next, which is why my bisect fell on the > > DRM merge. I am happy to provide whatever information could be helpful > > for debugging this. I am on the latest version of the firmware > > (currently 26620cc9a63c6cb9965374d509479b4ee2c30241). > > Unfortunately, the miniUART is in the same clock tree than the core > clock and will thus have those kind of issues when the core clock is > changed (which is also something that one should expect when using the > DRM or other drivers). > > The only real workaround there would be to switch to one of the PL011 > UARTs. I guess we can also somehow make the UART react to the core clock > frequency changes, but that's going to require some effort > > Maxime Ack, thank you for the reply! There does not really seem to be a whole ton of documentation around using one of the other PL011 UARTs so for now, I will just revert this commit locally. 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Wed, 30 Sep 2020 09:38:25 -0700 (PDT) Date: Wed, 30 Sep 2020 09:38:23 -0700 From: Nathan Chancellor To: Maxime Ripard Subject: Re: [PATCH v5 80/80] ARM: dts: bcm2711: Enable the display pipeline Message-ID: <20200930163823.GA237050@ubuntu-m3-large-x86> References: <20200929221526.GA1370981@ubuntu-m3-large-x86> <20200930140758.gummt3umouva3wyu@gilmour.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200930140758.gummt3umouva3wyu@gilmour.lan> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200930_123828_479512_AB521821 X-CRM114-Status: GOOD ( 26.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Wahren , Chanwoo Choi , Tim Gover , Dave Stevenson , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Phil Elwell , Eric Anholt , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Hoegeun Kwon , Nicolas Saenz Julienne , 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+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Sep 30, 2020 at 04:07:58PM +0200, Maxime Ripard wrote: > Hi Nathan, > > On Tue, Sep 29, 2020 at 03:15:26PM -0700, Nathan Chancellor wrote: > > On Thu, Sep 03, 2020 at 10:01:52AM +0200, Maxime Ripard wrote: > > > Now that all the drivers have been adjusted for it, let's bring in the > > > necessary device tree changes. > > > > > > The VEC and PV3 are left out for now, since it will require a more specific > > > clock setup. > > > > > > Reviewed-by: Dave Stevenson > > > Tested-by: Chanwoo Choi > > > Tested-by: Hoegeun Kwon > > > Tested-by: Stefan Wahren > > > Signed-off-by: Maxime Ripard > > > > Apologies if this has already been reported or have a solution but this > > patch (and presumably series) breaks output to the serial console after > > a certain point during init. On Raspbian, I see systemd startup messages > > then the output just turns into complete garbage. It looks like this > > patch is merged first in linux-next, which is why my bisect fell on the > > DRM merge. I am happy to provide whatever information could be helpful > > for debugging this. I am on the latest version of the firmware > > (currently 26620cc9a63c6cb9965374d509479b4ee2c30241). > > Unfortunately, the miniUART is in the same clock tree than the core > clock and will thus have those kind of issues when the core clock is > changed (which is also something that one should expect when using the > DRM or other drivers). > > The only real workaround there would be to switch to one of the PL011 > UARTs. I guess we can also somehow make the UART react to the core clock > frequency changes, but that's going to require some effort > > Maxime Ack, thank you for the reply! There does not really seem to be a whole ton of documentation around using one of the other PL011 UARTs so for now, I will just revert this commit locally. Cheers, Nathan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-6.5 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 653A6C47420 for ; Thu, 1 Oct 2020 08:16:27 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 23D9F2087E for ; 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Wed, 30 Sep 2020 09:38:26 -0700 (PDT) Received: from ubuntu-m3-large-x86 ([2604:1380:45e1:2200::1]) by smtp.gmail.com with ESMTPSA id e19sm3354451pfl.135.2020.09.30.09.38.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2020 09:38:25 -0700 (PDT) Date: Wed, 30 Sep 2020 09:38:23 -0700 From: Nathan Chancellor To: Maxime Ripard Subject: Re: [PATCH v5 80/80] ARM: dts: bcm2711: Enable the display pipeline Message-ID: <20200930163823.GA237050@ubuntu-m3-large-x86> References: <20200929221526.GA1370981@ubuntu-m3-large-x86> <20200930140758.gummt3umouva3wyu@gilmour.lan> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200930140758.gummt3umouva3wyu@gilmour.lan> X-Mailman-Approved-At: Thu, 01 Oct 2020 08:15:43 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Wahren , Chanwoo Choi , Tim Gover , Dave Stevenson , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Phil Elwell , bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Hoegeun Kwon , Nicolas Saenz Julienne , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Wed, Sep 30, 2020 at 04:07:58PM +0200, Maxime Ripard wrote: > Hi Nathan, > > On Tue, Sep 29, 2020 at 03:15:26PM -0700, Nathan Chancellor wrote: > > On Thu, Sep 03, 2020 at 10:01:52AM +0200, Maxime Ripard wrote: > > > Now that all the drivers have been adjusted for it, let's bring in the > > > necessary device tree changes. > > > > > > The VEC and PV3 are left out for now, since it will require a more specific > > > clock setup. > > > > > > Reviewed-by: Dave Stevenson > > > Tested-by: Chanwoo Choi > > > Tested-by: Hoegeun Kwon > > > Tested-by: Stefan Wahren > > > Signed-off-by: Maxime Ripard > > > > Apologies if this has already been reported or have a solution but this > > patch (and presumably series) breaks output to the serial console after > > a certain point during init. On Raspbian, I see systemd startup messages > > then the output just turns into complete garbage. It looks like this > > patch is merged first in linux-next, which is why my bisect fell on the > > DRM merge. I am happy to provide whatever information could be helpful > > for debugging this. I am on the latest version of the firmware > > (currently 26620cc9a63c6cb9965374d509479b4ee2c30241). > > Unfortunately, the miniUART is in the same clock tree than the core > clock and will thus have those kind of issues when the core clock is > changed (which is also something that one should expect when using the > DRM or other drivers). > > The only real workaround there would be to switch to one of the PL011 > UARTs. I guess we can also somehow make the UART react to the core clock > frequency changes, but that's going to require some effort > > Maxime Ack, thank you for the reply! There does not really seem to be a whole ton of documentation around using one of the other PL011 UARTs so for now, I will just revert this commit locally. Cheers, Nathan _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel