From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: [PATCH RFC 1/5] mmc: mmc: Introduce mmc_abort_tuning() Date: Thu, 1 Dec 2016 16:04:27 +0200 Message-ID: <1480601071-8881-2-git-send-email-adrian.hunter@intel.com> References: <1480601071-8881-1-git-send-email-adrian.hunter@intel.com> Return-path: Received: from mga03.intel.com ([134.134.136.65]:34517 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759525AbcLAOJk (ORCPT ); Thu, 1 Dec 2016 09:09:40 -0500 In-Reply-To: <1480601071-8881-1-git-send-email-adrian.hunter@intel.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Ulf Hansson Cc: linux-mmc If a tuning command times out, the card could still be processing it, which will cause problems for recovery. The eMMC specification says that CMD12 can be used to stop CMD21, so add a function that does that. Signed-off-by: Adrian Hunter --- drivers/mmc/core/mmc_ops.c | 25 +++++++++++++++++++++++++ include/linux/mmc/core.h | 1 + 2 files changed, 26 insertions(+) diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 9b2617cfff67..c0cfaaeb7637 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -688,6 +688,31 @@ int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error) } EXPORT_SYMBOL_GPL(mmc_send_tuning); +int mmc_abort_tuning(struct mmc_host *host, u32 opcode) +{ + struct mmc_command cmd = {0}; + + /* + * eMMC specification specifies that CMD12 can be used to stop a tuning + * command, but SD specification does not, so do nothing unless it is + * eMMC. + */ + if (opcode != MMC_SEND_TUNING_BLOCK_HS200) + return 0; + + cmd.opcode = MMC_STOP_TRANSMISSION; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; + + /* + * For drivers that override R1 to R1b, set an arbitrary timeout based + * on the tuning timeout i.e. 150ms. + */ + cmd.busy_timeout = 150; + + return mmc_wait_for_cmd(host, &cmd, 0); +} +EXPORT_SYMBOL_GPL(mmc_abort_tuning); + static int mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode, u8 len) diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 0ce928b3ce90..e33cc748dcfe 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -176,6 +176,7 @@ extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *, extern void mmc_start_bkops(struct mmc_card *card, bool from_exception); extern int mmc_switch(struct mmc_card *, u8, u8, u8, unsigned int); extern int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error); +extern int mmc_abort_tuning(struct mmc_host *host, u32 opcode); extern int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd); #define MMC_ERASE_ARG 0x00000000 -- 1.9.1