From: Nicolas Boichat <drinkcat@chromium.org> To: Ulf Hansson <ulf.hansson@linaro.org> Cc: Kalle Valo <kvalo@codeaurora.org>, Wen Gong <wgong@qti.qualcomm.com>, Grant Grundler <grundler@google.com>, Wen Gong <wgong@codeaurora.org>, "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>, "ath10k@lists.infradead.org" <ath10k@lists.infradead.org>, Claire Chang <tientzu@chromium.org> Subject: Re: [PATCH] ath10k: remove mmc_hw_reset while hif power down Date: Tue, 18 Jun 2019 19:39:46 +0900 [thread overview] Message-ID: <CANMq1KD7tjG4dq4YP=oKTs_Ki6Wd1E_VbT7+b7e4UeBGY-KMsw@mail.gmail.com> (raw) In-Reply-To: <CAPDyKFrs1rO38yd-yQ50y2Oo1JE=R2hWM-5FWp=Ng_TM1df7ww@mail.gmail.com> On Tue, May 28, 2019 at 9:46 PM Ulf Hansson <ulf.hansson@linaro.org> wrote: [snip] > > In the end, it seems like this needs a more detailed debug study, to > figure out what exactly happens during the re-initialization of the > SDIO card, rather than just papering over the problem by removing the > call to mmc_hw_reset() in the SDIO func driver. Hope this helps. To close the loop on this, we fixed this on the platform by driving a reset/enable pin during reset: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1657506 (device tree for this device is not upstream yet). The problem has to do with the fact that on re-init (without power cycle or reset/enable pin cycling), the device still sets S18A=1 in CMD5 response (that's incorrect, the device should set S18A=0 if it's already using 1.8V), so the host tries to switch voltage using CMD11, which fails, as the device is already in 1.8V mode (that's correct according to the specs). Thanks, > > Kind regards > Uffe
WARNING: multiple messages have this Message-ID (diff)
From: Nicolas Boichat <drinkcat@chromium.org> To: Ulf Hansson <ulf.hansson@linaro.org> Cc: Wen Gong <wgong@qti.qualcomm.com>, "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>, "ath10k@lists.infradead.org" <ath10k@lists.infradead.org>, Grant Grundler <grundler@google.com>, Wen Gong <wgong@codeaurora.org>, Claire Chang <tientzu@chromium.org>, Kalle Valo <kvalo@codeaurora.org> Subject: Re: [PATCH] ath10k: remove mmc_hw_reset while hif power down Date: Tue, 18 Jun 2019 19:39:46 +0900 [thread overview] Message-ID: <CANMq1KD7tjG4dq4YP=oKTs_Ki6Wd1E_VbT7+b7e4UeBGY-KMsw@mail.gmail.com> (raw) In-Reply-To: <CAPDyKFrs1rO38yd-yQ50y2Oo1JE=R2hWM-5FWp=Ng_TM1df7ww@mail.gmail.com> On Tue, May 28, 2019 at 9:46 PM Ulf Hansson <ulf.hansson@linaro.org> wrote: [snip] > > In the end, it seems like this needs a more detailed debug study, to > figure out what exactly happens during the re-initialization of the > SDIO card, rather than just papering over the problem by removing the > call to mmc_hw_reset() in the SDIO func driver. Hope this helps. To close the loop on this, we fixed this on the platform by driving a reset/enable pin during reset: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1657506 (device tree for this device is not upstream yet). The problem has to do with the fact that on re-init (without power cycle or reset/enable pin cycling), the device still sets S18A=1 in CMD5 response (that's incorrect, the device should set S18A=0 if it's already using 1.8V), so the host tries to switch voltage using CMD11, which fails, as the device is already in 1.8V mode (that's correct according to the specs). Thanks, > > Kind regards > Uffe _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k
next prev parent reply other threads:[~2019-06-18 10:39 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-04-28 2:17 [PATCH] ath10k: remove mmc_hw_reset while hif power down Wen Gong 2019-04-28 2:17 ` Wen Gong 2019-05-03 18:01 ` Grant Grundler 2019-05-03 18:01 ` Grant Grundler 2019-05-07 5:05 ` Wen Gong 2019-05-07 5:05 ` Wen Gong 2019-05-07 9:34 ` Kalle Valo 2019-05-07 9:34 ` Kalle Valo 2019-05-28 12:45 ` Ulf Hansson 2019-05-28 12:45 ` Ulf Hansson 2019-06-18 10:39 ` Nicolas Boichat [this message] 2019-06-18 10:39 ` Nicolas Boichat
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