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[95.91.236.49]) by smtp.gmail.com with ESMTPSA id a3sm3976850wrx.38.2021.08.17.15.42.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 15:42:49 -0700 (PDT) From: Bean Huo To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Bean Huo Subject: [PATCH v1 2/2] mmc: core: Let BKOPS timeout readable/writable via sysfs Date: Wed, 18 Aug 2021 00:42:08 +0200 Message-Id: <20210817224208.153652-3-huobean@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210817224208.153652-1-huobean@gmail.com> References: <20210817224208.153652-1-huobean@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bean Huo For special cases, the application in the userspace wants to change BKOPS operation timeout value, also, wants eMMC back to R1_STATE_TRAN after BKOPS timeouts. A fixed BKOPS timeout value(120s) is no longer feasible, therefore, it is better to let the user controls its timeout value. Signed-off-by: Bean Huo --- drivers/mmc/core/mmc.c | 32 ++++++++++++++++++++++++++++++++ drivers/mmc/core/mmc_ops.c | 3 +-- include/linux/mmc/card.h | 1 + 3 files changed, 34 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 838726b68ff3..617ff18b5b0e 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -29,6 +29,7 @@ #define DEFAULT_CMD6_TIMEOUT_MS 500 #define MIN_CACHE_EN_TIMEOUT_MS 1600 #define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */ +#define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */ static const unsigned int tran_exp[] = { 10000, 100000, 1000000, 10000000, @@ -836,6 +837,35 @@ static ssize_t mmc_dsr_show(struct device *dev, static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); +static ssize_t bkops_timeout_ms_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct mmc_card *card = mmc_dev_to_card(dev); + return sysfs_emit(buf, "%d\n", card->bkops_timeout_ms); +} + +static ssize_t bkops_timeout_ms_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct mmc_card *card = mmc_dev_to_card(dev); + unsigned int new; + int ret; + + ret = kstrtouint(buf, 0, &new); + if (ret < 0) + return ret; + + if (new == 0) + return -EINVAL; + + card->bkops_timeout_ms = new; + + return len; +} + +static DEVICE_ATTR_RW(bkops_timeout_ms); + static struct attribute *mmc_std_attrs[] = { &dev_attr_cid.attr, &dev_attr_csd.attr, @@ -862,6 +892,7 @@ static struct attribute *mmc_std_attrs[] = { &dev_attr_rca.attr, &dev_attr_dsr.attr, &dev_attr_cmdq_en.attr, + &dev_attr_bkops_timeout_ms.attr, NULL, }; ATTRIBUTE_GROUPS(mmc_std); @@ -1624,6 +1655,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, card->ocr = ocr; card->type = MMC_TYPE_MMC; card->rca = 1; + card->bkops_timeout_ms = MMC_BKOPS_TIMEOUT_MS; memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); } diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 0c54858e89c0..9af5e4671de2 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -19,7 +19,6 @@ #include "host.h" #include "mmc_ops.h" -#define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */ #define MMC_SANITIZE_TIMEOUT_MS (240 * 1000) /* 240s */ static const u8 tuning_blk_pattern_4bit[] = { @@ -958,7 +957,7 @@ void mmc_run_bkops(struct mmc_card *card) * urgent levels by using an asynchronous background task, when idle. */ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, - EXT_CSD_BKOPS_START, 1, MMC_BKOPS_TIMEOUT_MS); + EXT_CSD_BKOPS_START, 1, card->bkops_timeout_ms); /* * If the BKOPS timed out, the card is probably still busy in the * R1_STATE_PRG. Rather than continue to wait, let's try to abort diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 74e6c0624d27..9e038d212067 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -294,6 +294,7 @@ struct mmc_card { bool reenable_cmdq; /* Re-enable Command Queue */ + unsigned int bkops_timeout_ms; unsigned int erase_size; /* erase size in sectors */ unsigned int erase_shift; /* if erase unit is power 2 */ unsigned int pref_erase; /* in sectors */ -- 2.25.1