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(mreue009 [212.227.15.167]) with ESMTPSA (Nemesis) id 1M6lxe-1kKtvI2KFy-008J9f; Wed, 30 Sep 2020 18:52:18 +0200 Subject: Re: [PATCH v5 80/80] ARM: dts: bcm2711: Enable the display pipeline To: Nathan Chancellor , Maxime Ripard Cc: Nicolas Saenz Julienne , Eric Anholt , 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 References: <20200929221526.GA1370981@ubuntu-m3-large-x86> <20200930140758.gummt3umouva3wyu@gilmour.lan> <20200930163823.GA237050@ubuntu-m3-large-x86> From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tClZlcnNpb246IEdudVBHIHYy CgptUUlOQkZ0NmdCTUJFQUN1Yi9wQmV2SHhidkplZnlaRzMySklObW4yYnNFUFgyNVY2ZmVq bXlZd21DR0tqRnRMCi9Eb1VNRVZIRHhDSjQ3Qk1YbzM0NGZIVjFDM0FudWRnTjFCZWhMb0J0 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V03:K1:E9Rk/K/gMH92DqJLWrbfP4Ciq1ARTulMrAvAOlEzpdEClW8QkUu MxbuhJVUlEI22OHRmUcGjtbjPkaNIeNOJ4XWJWLeKKw88Fa2e1xUgIQsbWjhO5pW5XTFAO9 QbxEj7duKz9WidlyupBsZGrtoTbm9oFLck25kvHjW7Kn9mvtF0nuC6kWWG0hd2LhrknpUjp 0ZWr5eRZLx6FaTjU2p4Xg== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:4WXWGay/9zA=:ZNQ5+MCd5ad/GljGQJY1kt KxuM6AVjMbe9RZxgttCoI0BAiVZjWKcBEKd2S/TmryVxWRj/SBNeo7QAkxzmh7UKfP8icKvgA WJLHy5oUkIroJiS1JB7/s1Bcv2K3I9sx1fVFOp6sLxNXmaWvSz4Ah8mUPN7RlowqQ0iOmx0ww sJ762mqTUgmDqzOZITN3pM33gngEIrlikBJ077W+LnK00odQZm9dYk9/hlXlyt/sQ5kxsE7BZ DAI14ZUNnuVrDzU3xx6kmTdaL9hx8pwVrsxFXq+BfC+UZxjppIlgeBWIxeFbJaaCjZiXUnm9l 1+kp7BzmvibRivfpQqQb9iqQR0gsHXXhJXavX4Po170jcOWIjaAPhjTAoHWYoi0sto6Nr3rUk SGvBFWUhl5ea2YzHFfqfPQHyPijcMV3xmG4DUAl+f54sIlRyn64oGDj+a6yGX4A0ZQjdDWvoW Xqc72N3PmtRiON9yZW1yiMfK/n5TDc9gVhAXlrM5wdhxnF6BvU1aX5w33c4IKfJPCO12WteP7 Z7lxQ4frtSbeTB52nKWiSb0Dldnaodjvp80DK+SmqEOqONKR/aKN7siou1shApWR1kMIBdzxC 6jwDwSWegpwzTe7XGIIVPhMiv1DjNjHMpXovxB8n5dLBjPWENR3jPLu0NpW+1EfP/Me7eUkLy 9IJKoSM5VuGnwz4Wue+j6aPPRF67ohvFOF7uf0qbnEaGvsRgHDr1VuKryEJi6WocRYA/F00EY kB/l4YcB9jaDqbSvs6XNR52lRvIt5racQc+CndFRFOCyMTkl517Ks21E9aUN0ypi+NLdt7axk uVtkKQuQaxKay7/Uop2iChH7BQ6+A5UcnpVVd7Vqe+44BbsqBMeypQWX+nIgkTv0C6vbwC5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Am 30.09.20 um 18:38 schrieb Nathan Chancellor: > 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. there was a patch series & discussion about this topic, but we finally didn't find a rock solid solution. You can have a look at "[RFC 5/5] serial: 8250: bcm2835aux: add notifier to follow clock changes" from 3.4.2019 on linux-rpi-kernel. Best regards > > Cheers, > Nathan