From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Tue, 13 Dec 2022 15:13:58 +0100 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1p562f-002hde-VU for lore@lore.pengutronix.de; Tue, 13 Dec 2022 15:13:58 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1p562e-0000wW-Vf for lore@pengutronix.de; Tue, 13 Dec 2022 15:13:57 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=7+4ddenDU5IJjXB15uSnl0vkemPh1cL0BoBtrIUSFUM=; b=gADDh4dKu8kK4seANwCADYwyUO DMG4OschSeOReLHPl8rkIKJWI/wMkDicrPRNCRh+p1cZIizm9smeKl0F9pHsVMZC9VlkM5lKedPkG XpOeNWacBxgvYoWqNcrHitXgHqbxE2XiO9c4d7Fm7npxDm+Lyf1RfiKn+wUAdUUZj/dFLtvgTibvj aNd+Dt4JkTSks//UCkuSh+bmmUmMQ4JFNXWmKQTR60f+8wcuLOrR76IwDfHSByXELKPTWlJwGPFmb PqbRsB1d513WXfH/auwkmkMrFkd+7qsMDQ+l8DexkLM2nntM2bVxRu6m5xPeoOAOmyvu3tFU+F6LV 6Tl28dpg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p5614-000y2g-3b; Tue, 13 Dec 2022 14:12:18 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p560x-000xqX-09 for barebox@lists.infradead.org; Tue, 13 Dec 2022 14:12:13 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1p560s-0000mg-Nc; Tue, 13 Dec 2022 15:12:06 +0100 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1p560r-004Gce-Au; Tue, 13 Dec 2022 15:12:06 +0100 Received: from afa by dude04.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1p560r-007wXY-Hd; Tue, 13 Dec 2022 15:12:05 +0100 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Tue, 13 Dec 2022 15:12:04 +0100 Message-Id: <20221213141204.1860400-1-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221213_061211_064987_870E5DB0 X-CRM114-Status: GOOD ( 24.84 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.7 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH] mci: only write blocks when card out of programming mode X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) eMMC Spec v5.1 (JEDEC Standard No. 84-B51) is quite clear that: Due to legacy reasons, a Device may still treat CMD24/25 during prg-state (while busy is active) as a legal or illegal command. A host should not send CMD24/25 while the Device is in the prg state and busy is active. So far, we had never evaluated MMC_CMD_SEND_STATUS. This patch corrects this and thereby resolves an issue of timed out writes with the atmel_mci driver: barebox@SAMA5D4:/ saveenv ERROR: atmel_mci fc000000.mmc@fc000000.of: command/data timeout ERROR: atmel_mci fc000000.mmc@fc000000.of: command/data timeout These issues are not new, but were first reported in 2018[0] along with a workaround suggesting a delay at the end of atmci_request: if (cmdidx == MMC_CMD_STOP_TRANSMISSION) mdelay(5) Just before the command timing out, we read 0x00c00_0025 from the status register, which is CMDRDY | TXRDY | NOTBUSY | XFERDONE | FIFOEMPTY which suggests the issue is not at the MCI host side, but rather at the card side. With this patch applied and debugging enabled, this seems to be confirmed: barebox@SAMA5D4:/ saveenv saving environment mmc1: Ready polling took 0ms mmc1: Ready polling took 4ms I compared with AT91Bootstrap[1], U-Boot[2] and Trusted Firmware-A[3] and all of them poll MCI status after block writes. The sequence imported here is taken from U-Boot, but instead of doing it after writes, we do it before them in hope that we need not always incur the extra delay. I don't have an answer why this was only necessary on the SAMA5D3/4 and such issues weren't observed with other drivers. Card was operated at 50MHz (SD HS) and I didn't observe differences when trying other cards. I tested this change also on a Beaglebone Black where an environment is also stored into FAT on a SD-Card operated with 50 MHz: Ready polling took 0ms for each of the two writes. [0]: https://lore.barebox.org/barebox/20181102091156.26476-1-s.hauer@pengutronix.de/ [1]: https://github.com/linux4sam/at91bootstrap/blob/v4.0.5/driver/mci_media.c#L1187 [2]: https://github.com/trini/u-boot/blob/v2023.01-rc3/drivers/mmc/mmc_write.c#L181 [3]: https://github.com/ARM-software/arm-trusted-firmware/blob/v2.8.0/drivers/mmc/mmc.c#L718 Signed-off-by: Ahmad Fatoum --- For next, not master. I intend to test this change across more devices in the coming weeks. --- drivers/mci/mci-core.c | 96 ++++++++++++++++++++++++++++++++++++++++++ include/mci.h | 15 +++++++ 2 files changed, 111 insertions(+) diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c index 8cda07e71120..ec78bd33911c 100644 --- a/drivers/mci/mci-core.c +++ b/drivers/mci/mci-core.c @@ -74,6 +74,28 @@ static int mci_send_cmd(struct mci *mci, struct mci_cmd *cmd, struct mci_data *d return host->send_cmd(mci->host, cmd, data); } +/** + * mci_send_cmd_retry() - send a command to the mmc device, retrying on error + * + * @dev: device to receive the command + * @cmd: command to send + * @data: additional data to send/receive + * @retries: how many times to retry; mci_send_cmd is always called at least + * once + * Return: 0 if ok, -ve on error + */ +static int mci_send_cmd_retry(struct mci *mci, struct mci_cmd *cmd, + struct mci_data *data, unsigned retries) +{ + int ret; + + do + ret = mci_send_cmd(mci, cmd, data); + while (ret && retries--); + + return ret; +} + /** * @param p Command definition to setup * @param cmd Valid SD/MMC command (refer MMC_CMD_* / SD_CMD_*) @@ -119,6 +141,69 @@ static int mci_set_blocklen(struct mci *mci, unsigned len) static void *sector_buf; +static int mci_send_status(struct mci *mci, unsigned int *status) +{ + struct mci_host *host = mci->host; + struct mci_cmd cmd; + int ret; + + cmd.cmdidx = MMC_CMD_SEND_STATUS; + cmd.resp_type = MMC_RSP_R1; + if (!mmc_host_is_spi(host)) + cmd.cmdarg = mci->rca << 16; + + ret = mci_send_cmd_retry(mci, &cmd, NULL, 4); + if (!ret) + *status = cmd.response[0]; + + return ret; +} + +static int mci_poll_until_ready(struct mci *mci, int timeout_ms) +{ + unsigned int status; + int err, retries = 0; + + while (1) { + err = mci_send_status(mci, &status); + if (err) + return err; + + /* + * Some cards mishandle the status bits, so make sure to + * check both the busy indication and the card state. + */ + if ((status & R1_READY_FOR_DATA) && + R1_CURRENT_STATE(status) != R1_STATE_PRG) + break; + + if (status & R1_STATUS_MASK) { + dev_err(&mci->dev, "Status Error: 0x%08x\n", status); + return -EIO; + } + + if (retries++ == timeout_ms) + break; + + udelay(1000); + } + + if (retries >= timeout_ms) { + dev_err(&mci->dev, "Timeout waiting card ready\n"); + return -ETIMEDOUT; + } + + /* + * With small UART FIFOs and slow CPUs, printing in the loop above + * may take enough time to render the polling loop above unnecessary + * falsifying the debugging info. Thus we report the retries here. + */ + dev_info(&mci->dev, "Ready polling took %ums\n", retries); + + return 0; +} + + /** * Write one or several blocks of data to the card * @param mci_dev MCI instance @@ -136,6 +221,17 @@ static int mci_block_write(struct mci *mci, const void *src, int blocknum, unsigned mmccmd; int ret; + /* + * Quoting eMMC Spec v5.1 (JEDEC Standard No. 84-B51): + * Due to legacy reasons, a Device may still treat CMD24/25 during + * prg-state (while busy is active) as a legal or illegal command. + * A host should not send CMD24/25 while the Device is in the prg + * state and busy is active. + */ + ret = mci_poll_until_ready(mci, 10 /* ms */); + if (ret) + return ret; + if (blocks > 1) mmccmd = MMC_CMD_WRITE_MULTIPLE_BLOCK; else diff --git a/include/mci.h b/include/mci.h index d949310fac30..1e53a09d71db 100644 --- a/include/mci.h +++ b/include/mci.h @@ -308,8 +308,23 @@ #define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */ #define R1_ILLEGAL_COMMAND (1 << 22) +#define R1_STATUS(x) (x & 0xFFF9A000) +#define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */ +#define R1_READY_FOR_DATA (1 << 8) /* sx, a */ #define R1_APP_CMD (1 << 5) +#define R1_STATUS_MASK (~0x0206BF7F) + +#define R1_STATE_IDLE 0 +#define R1_STATE_READY 1 +#define R1_STATE_IDENT 2 +#define R1_STATE_STBY 3 +#define R1_STATE_TRAN 4 +#define R1_STATE_DATA 5 +#define R1_STATE_RCV 6 +#define R1_STATE_PRG 7 +#define R1_STATE_DIS 8 + #define R1_SPI_IDLE (1 << 0) #define R1_SPI_ERASE_RESET (1 << 1) #define R1_SPI_ILLEGAL_COMMAND (1 << 2) -- 2.30.2