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=-8.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 5F361C31E4A for ; Thu, 13 Jun 2019 23:42:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 31D8D2173C for ; Thu, 13 Jun 2019 23:42:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="VlbrMMDK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727438AbfFMXmh (ORCPT ); Thu, 13 Jun 2019 19:42:37 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:33384 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727341AbfFMXmM (ORCPT ); Thu, 13 Jun 2019 19:42:12 -0400 Received: by mail-pf1-f196.google.com with SMTP id x15so226346pfq.0 for ; Thu, 13 Jun 2019 16:42:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=VtrTSgIpf1xWm97iCxjL9r9Hr48USPFt3UpK18m2DGw=; b=VlbrMMDKbT4x3Yq8VVmgt3/aCuibVx46072FJZ85/2afM5Hoa9T45Tc95JV4QsjlHB rCVUUCDzd5r+hoHzmy89Z8rrvygMTjG//urZJ5Ek8TGoyjtalSNfqpLyR02bIOXAthdA Wo9gEBu1br9rAsGKlA2eFHXM1lLylkQ+rT+xI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=VtrTSgIpf1xWm97iCxjL9r9Hr48USPFt3UpK18m2DGw=; b=PavjRVG90iaPeCl1IZd3KOUEorIt3WqDyHq5MfUyJOFCvvDXOVg+P0PTPE2b6g8oXB 3zLLIhkccMSzWqZ066DrQmws4NnWRoIPHJj8L9tVklBJu7vp6dIMN7cnnIzSrOJSsBze kVssP9xKRSECSUGIcaaLWr1Ps7otbGdeSE9tyBJ6uK9FafibVittFYlhFPpBRz9oCBBJ gE1Q3huEhlItc3J0gYXwE2vrpCqqI2UHa5u1m/Yj7QrjCpFQjdN0JlNL+xzC2rXUFZBb DGiiElw/qPC3Pq5y1nWBoiap6ncqbeeSIuThaQButYtsrUINvjun+uwuEMtIawqHQeWC Ty9g== X-Gm-Message-State: APjAAAUJJlS20wdeIXWYmzI5GMSQvnl54NG6rgkorklKIgYbYPTcKngw yE9+0ujYZCytzCxwTdf7PPFQ1A== X-Google-Smtp-Source: APXvYqwOtyJFXBqMXgHurwXO78zJmhJfJcPcRJQtQzXHSDqjugUINkmcJyuTNXHTDEegD1kcT7ujFQ== X-Received: by 2002:a17:90a:8a10:: with SMTP id w16mr7994113pjn.133.1560469330656; Thu, 13 Jun 2019 16:42:10 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:24fa:e766:52c9:e3b2]) by smtp.gmail.com with ESMTPSA id p7sm781088pfp.131.2019.06.13.16.42.09 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 13 Jun 2019 16:42:10 -0700 (PDT) From: Douglas Anderson To: Ulf Hansson , Kalle Valo , Adrian Hunter , Arend van Spriel Cc: brcm80211-dev-list.pdl@broadcom.com, linux-rockchip@lists.infradead.org, Double Lo , briannorris@chromium.org, linux-wireless@vger.kernel.org, Naveen Gupta , Madhan Mohan R , mka@chromium.org, Wright Feng , Chi-Hsien Lin , netdev@vger.kernel.org, brcm80211-dev-list@cypress.com, Douglas Anderson , Jiong Wu , Ritesh Harjani , Allison Randal , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Gleixner , Greg Kroah-Hartman , Shawn Lin , Wolfram Sang , Avri Altman Subject: [PATCH v4 2/5] mmc: core: API to temporarily disable retuning for SDIO CRC errors Date: Thu, 13 Jun 2019 16:41:50 -0700 Message-Id: <20190613234153.59309-3-dianders@chromium.org> X-Mailer: git-send-email 2.22.0.rc2.383.gf4fbbf30c2-goog In-Reply-To: <20190613234153.59309-1-dianders@chromium.org> References: <20190613234153.59309-1-dianders@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Normally when the MMC core sees an "-EILSEQ" error returned by a host controller then it will trigger a retuning of the card. This is generally a good idea. However, if a command is expected to sometimes cause transfer errors then these transfer errors shouldn't cause a re-tuning. This re-tuning will be a needless waste of time. One example case where a transfer is expected to cause errors is when transitioning between idle (sometimes referred to as "sleep" in Broadcom code) and active state on certain Broadcom WiFi SDIO cards. Specifically if the card was already transitioning between states when the command was sent it could cause an error on the SDIO bus. Let's add an API that the SDIO function drivers can call that will temporarily disable the auto-tuning functionality. Then we can add a call to this in the Broadcom WiFi driver and any other driver that might have similar needs. NOTE: this makes the assumption that the card is already tuned well enough that it's OK to disable the auto-retuning during one of these error-prone situations. Presumably the driver code performing the error-prone transfer knows how to recover / retry from errors. ...and after we can get back to a state where transfers are no longer error-prone then we can enable the auto-retuning again. If we truly find ourselves in a case where the card needs to be retuned sometimes to handle one of these error-prone transfers then we can always try a few transfers first without auto-retuning and then re-try with auto-retuning if the first few fail. Without this change on rk3288-veyron-minnie I periodically see this in the logs of a machine just sitting there idle: dwmmc_rockchip ff0d0000.dwmmc: Successfully tuned phase to XYZ Fixes: bd11e8bd03ca ("mmc: core: Flag re-tuning is needed on CRC errors") Signed-off-by: Douglas Anderson --- Changes in v4: - Moved to SDIO API only (Adrian, Ulf). - Renamed to make it less generic, now retune_crc_disable (Ulf). - Function header makes it clear host must be claimed (Ulf). - No more WARN_ON (Ulf). Changes in v3: - Took out the spinlock since I believe this is all in one context. Changes in v2: - Updated commit message to clarify based on discussion of v1. drivers/mmc/core/core.c | 5 +++-- drivers/mmc/core/sdio_io.c | 36 +++++++++++++++++++++++++++++++++++ include/linux/mmc/core.h | 2 ++ include/linux/mmc/host.h | 1 + include/linux/mmc/sdio_func.h | 3 +++ 5 files changed, 45 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 6db36dc870b5..9020cb2490f7 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -144,8 +144,9 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq) int err = cmd->error; /* Flag re-tuning needed on CRC errors */ - if ((cmd->opcode != MMC_SEND_TUNING_BLOCK && - cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) && + if (cmd->opcode != MMC_SEND_TUNING_BLOCK && + cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200 && + !host->retune_crc_disable && (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) || (mrq->data && mrq->data->error == -EILSEQ) || (mrq->stop && mrq->stop->error == -EILSEQ))) diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c index f79f0b0caab8..f822a9630b0e 100644 --- a/drivers/mmc/core/sdio_io.c +++ b/drivers/mmc/core/sdio_io.c @@ -734,3 +734,39 @@ int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags) return 0; } EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags); + +/** + * sdio_retune_crc_disable - temporarily disable retuning on CRC errors + * @func: SDIO function attached to host + * + * If the SDIO card is known to be in a state where it might produce + * CRC errors on the bus in response to commands (like if we know it is + * transitioning between power states), an SDIO function driver can + * call this function to temporarily disable the SD/MMC core behavior of + * triggering an automatic retuning. + * + * This function should be called while the host is claimed and the host + * should remain claimed until sdio_retune_crc_enable() is called. + * Specifically, the expected sequence of calls is: + * - sdio_claim_host() + * - sdio_retune_crc_disable() + * - some number of calls like sdio_writeb() and sdio_readb() + * - sdio_release_host() + */ +void sdio_retune_crc_disable(struct sdio_func *func) +{ + func->card->host->retune_crc_disable = true; +} +EXPORT_SYMBOL_GPL(sdio_retune_crc_disable); + +/** + * sdio_retune_crc_enable - reneable retuning on CRC errors + * @func: SDIO function attached to host + * + * This is the compement to sdio_retune_crc_disable(). + */ +void sdio_retune_crc_enable(struct sdio_func *func) +{ + func->card->host->retune_crc_disable = false; +} +EXPORT_SYMBOL_GPL(sdio_retune_crc_enable); diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 134a6483347a..02a13abf0cda 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -178,6 +178,8 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int mmc_hw_reset(struct mmc_host *host); int mmc_sw_reset(struct mmc_host *host); +void mmc_expect_errors_begin(struct mmc_host *host); +void mmc_expect_errors_end(struct mmc_host *host); void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card); #endif /* LINUX_MMC_CORE_H */ diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 43d0f0c496f6..ecb7972e2423 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -398,6 +398,7 @@ struct mmc_host { unsigned int retune_now:1; /* do re-tuning at next req */ unsigned int retune_paused:1; /* re-tuning is temporarily disabled */ unsigned int use_blk_mq:1; /* use blk-mq */ + unsigned int retune_crc_disable:1; /* don't trigger retune upon crc */ int rescan_disable; /* disable card detection */ int rescan_entered; /* used with nonremovable devices */ diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h index e9dfdd501cd1..4820e6d09dac 100644 --- a/include/linux/mmc/sdio_func.h +++ b/include/linux/mmc/sdio_func.h @@ -167,4 +167,7 @@ extern void sdio_f0_writeb(struct sdio_func *func, unsigned char b, extern mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func); extern int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags); +extern void sdio_retune_crc_disable(struct sdio_func *func); +extern void sdio_retune_crc_enable(struct sdio_func *func); + #endif /* LINUX_MMC_SDIO_FUNC_H */ -- 2.22.0.rc2.383.gf4fbbf30c2-goog