From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753648AbeE3P6C (ORCPT ); Wed, 30 May 2018 11:58:02 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:35734 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751623AbeE3P6A (ORCPT ); Wed, 30 May 2018 11:58:00 -0400 X-Google-Smtp-Source: ADUXVKJnazmnu97/PtI54CCiqjZKHVtzKQ8uz0y32+J57HToPPjAuwaoYV9SeGA51hjowcMgHo1pQA== Subject: Re: [PATCH v2 4/4] mmc: sdhci-msm: Add sdhci msm register write APIs which wait for pwr irq To: Vijay Viswanath Cc: adrian.hunter@intel.com, ulf.hansson@linaro.org, will.deacon@arm.com, linux-arm-kernel@lists.infradead.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, asutoshd@codeaurora.org, stummala@codeaurora.org, riteshh@codeaurora.org, subhashj@codeaurora.org, Bjorn Andersson References: <1506490483-46871-1-git-send-email-vviswana@codeaurora.org> <1506490483-46871-5-git-send-email-vviswana@codeaurora.org> <74a4fe0e-7ae8-9f49-5614-1e01ae977475@linaro.org> <6c84f6fc-270c-d826-6d87-7f9f6fc5015f@codeaurora.org> From: Georgi Djakov Openpgp: preference=signencrypt Autocrypt: addr=georgi.djakov@linaro.org; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Vijay, On 05/30/2018 10:11 AM, Vijay Viswanath wrote: > Hi Georgi, > > Thanks for testing the patch on 8096 and pointing out this issue. > The issue is coming because, when card is removed, the HOST_CONTROL2 > register is retaining the 1.8V Signalling enable bit till SDHCI reset > happens after a new card is inserted. > > Adding the change you suggested can avoid this wait, but I feel a better > solution is to clear the 1.8V signalling bit when the card is removed. > When a new card is inserted, we shouldn't be keeping the 1.8V bit set > until we send cmd11 to the SD card. A new SD card should start with 3V. > > One solution is to explicitly clear the HOST_CONTROL2 register when card > is removed. > > Other way is to revert the commit: > 9718f84b85396e090ca42fafa730410d286d61e3 "mmc: sdhci-msm: Do not reset > the controller if no card in the slot" > > The sdhci-msm doesn't require "SDHCI_QUIRK_NO_CARD_NO_RESET". The issue > which above commit is trying to avoid is fixed by the pwr-irq patches. > Resetting the controller will clear the HOST_CONTROL2 register and avoid > this issue. > > Can you please try this ? I tested reverting the QUIRK on two platforms: > db410c(8916) and sdm845. SD card insert/remove worked fine after that > and I didn't get any "Reset 0x1 never completed" error during card > insert/remove or shutdown. Thank you! I have submitted a patch to remove the quirk and tested it on db410c and db820c. BR, Georgi