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<6523119a-50ac-973a-d1cd-ab1569259411@nvidia.com> Message-ID: Date: Tue, 25 Feb 2020 11:41:31 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <6523119a-50ac-973a-d1cd-ab1569259411@nvidia.com> X-Originating-IP: [172.20.13.39] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1582630860; bh=kN3trSKoccgVaVoLzgLr6MddKiuYEMaFJBNPZvEzBt8=; h=X-PGP-Universal:Subject:From:To:CC:References:Message-ID:Date: User-Agent:MIME-Version:In-Reply-To:X-Originating-IP: X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=jcoG8NiUW+9/vpRg5f9yNJFSRtICczCMS8LRMfCL22Ns33XRFKglyjZTyZdFKI1m/ Xy7Qhvsmwo5Bfjzdk5oi2yuKlXEo2gDO8LdneqUJix7SjcERGs2iL0jOE1qcrBPSUG Dp1vG4V4r4Usty1XFbQLi/KD8nM3x8k77voEA+fNzW+ATMmbQcgF71bxv9MrdBf8I5 o46ihG47nP8qEAeDJJTouOdZT5CJrbgU6eEar/y1qbXd4xyfdibd8AgzskBQIbMdaf MBAdVvI0rxU6J67yhiPoMs2JbPAWJubD5/z4z2C1BCYRe29OpVgWjmLHYqEKUSljYQ YIHTQOut/qpwQ== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 25/02/2020 10:04, Jon Hunter wrote: ... >>> I find that from the commit the changes in mmc_flush_cache below is >>> the cause. >>> >>> ## >>> @@ -961,7 +963,8 @@ int mmc_flush_cache(struct mmc_card *card) >>> (card->ext_csd.cache_size > 0) && >>> (card->ext_csd.cache_ctrl & 1)) { >>> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, >>> - EXT_CSD_FLUSH_CACHE, 1, 0); >>> + EXT_CSD_FLUSH_CACHE, 1, >>> + MMC_CACHE_FLUSH_TIMEOUT_MS); > > > I no longer see the issue on reverting the above hunk as Bitan suggested > but now I see the following (which is expected) ... > > WARNING KERN mmc1: unspecified timeout for CMD6 - use generic For Tegra, the default timeout used when no timeout is specified for CMD6 is 100mS. So hard-coding the following also appears to workaround the problem on Tegra ... diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 868653bc1555..5155e0240fca 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -992,7 +992,7 @@ int mmc_flush_cache(struct mmc_card *card) (card->ext_csd.cache_size > 0) && (card->ext_csd.cache_ctrl & 1)) { err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_FLUSH_CACHE, 1, 0); + EXT_CSD_FLUSH_CACHE, 1, 100); if (err) pr_err("%s: cache flush error %d\n", mmc_hostname(card->host), err); So the problem appears to be causing by the timeout being too long rather than not long enough. Looking more at the code, I think now that we are hitting the condition ... diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 868653bc1555..feae82b1ff35 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -579,8 +579,10 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, * the host to avoid HW busy detection, by converting to a R1 response * instead of a R1B. */ - if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) + if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) { + pr_warn("%s: timeout (%d) > max busy timeout (%d)", mmc_hostname(host), timeout_ms, host->max_busy_timeout); use_r1b_resp = false; + } With the above I see ... WARNING KERN mmc1: timeout (1600) > max busy timeout (672) So with the longer timeout we are not using/requesting the response. Cheers Jon -- nvpublic