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[104.57.184.186]) by smtp.gmail.com with ESMTPSA id 33sm590834otr.25.2020.10.29.06.40.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2020 06:40:20 -0700 (PDT) Date: Thu, 29 Oct 2020 08:40:17 -0500 From: Bjorn Andersson To: Rob Herring Cc: Amit Pundir , Kalle Valo , David S Miller , Jakub Kicinski , Jeffrey Hugo , John Stultz , Sumit Semwal , Konrad Dybcio , ath10k@lists.infradead.org, devicetree@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, lkml Subject: Re: [PATCH] ath10k: Introduce a devicetree quirk to skip host cap QMI requests Message-ID: <20201029134017.GA807@yoga> References: <1601058581-19461-1-git-send-email-amit.pundir@linaro.org> <20200929190817.GA968845@bogus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200929190817.GA968845@bogus> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue 29 Sep 14:08 CDT 2020, Rob Herring wrote: > On Fri, Sep 25, 2020 at 11:59:41PM +0530, Amit Pundir wrote: > > There are firmware versions which do not support host capability > > QMI request. We suspect either the host cap is not implemented or > > there may be firmware specific issues, but apparently there seem > > to be a generation of firmware that has this particular behavior. > > > > For example, firmware build on Xiaomi Poco F1 (sdm845) phone: > > "QC_IMAGE_VERSION_STRING=WLAN.HL.2.0.c3-00257-QCAHLSWMTPLZ-1" > > > > If we do not skip the host cap QMI request on Poco F1, then we > > get a QMI_ERR_MALFORMED_MSG_V01 error message in the > > ath10k_qmi_host_cap_send_sync(). But this error message is not > > fatal to the firmware nor to the ath10k driver and we can still > > bring up the WiFi services successfully if we just ignore it. > > > > Hence introducing this DeviceTree quirk to skip host capability > > QMI request for the firmware versions which do not support this > > feature. > > So if you change the WiFi firmware, you may force a DT change too. Those > are pretty independent things otherwise. > Yes and that's not good. But I looked at somehow derive this from firmware version numbers etc and it's not working out, so I'm out of ideas for alternatives. > Why can't you just always ignore this error? If you can't deal with this > entirely in the driver, then it should be part of the WiFi firmware so > it's always in sync. > Unfortunately the firmware versions I've hit this problem on has gone belly up when receiving this request, that's why I asked Amit to add a flag to skip it. That said, in the devices I've hit this I've managed to get newer firmware working, which doesn't have either problem. Regards, Bjorn