From b2be40b73b29921e5c7f2e3a11ceaa31c508326c Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 15 Nov 2018 15:53:41 +0200 Subject: [PATCH] mmc: sdhci: Fix data command CRC error handling [ Upstream commit 4bf780996669280171c9cd58196512849b93434e ] Existing data command CRC error handling is non-standard and does not work with some Intel host controllers. Specifically, the assumption that the host controller will continue operating normally after the error interrupt, is not valid. Change the driver to handle the error in the same manner as a data CRC error, taking care to ensure that the data line reset is done for single or multi-block transfers, and it is done before unmapping DMA. Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin --- drivers/mmc/host/sdhci.c | 40 +++++++++++++++------------------------- 1 file changed, 15 insertions(+), 25 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 654051e..4bfaca3 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1078,8 +1078,7 @@ static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq) return (!(host->flags & SDHCI_DEVICE_DEAD) && ((mrq->cmd && mrq->cmd->error) || (mrq->sbc && mrq->sbc->error) || - (mrq->data && ((mrq->data->error && !mrq->data->stop) || - (mrq->data->stop && mrq->data->stop->error))) || + (mrq->data && mrq->data->stop && mrq->data->stop->error) || (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))); } @@ -1131,6 +1130,16 @@ static void sdhci_finish_data(struct sdhci_host *host) host->data = NULL; host->data_cmd = NULL; + /* + * The controller needs a reset of internal state machines upon error + * conditions. + */ + if (data->error) { + if (!host->cmd || host->cmd == data_cmd) + sdhci_do_reset(host, SDHCI_RESET_CMD); + sdhci_do_reset(host, SDHCI_RESET_DATA); + } + if ((host->flags & (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) == (SDHCI_REQ_USE_DMA | SDHCI_USE_ADMA)) sdhci_adma_table_post(host, data); @@ -1155,17 +1164,6 @@ static void sdhci_finish_data(struct sdhci_host *host) if (data->stop && (data->error || !data->mrq->sbc)) { - - /* - * The controller needs a reset of internal state machines - * upon error conditions. - */ - if (data->error) { - if (!host->cmd || host->cmd == data_cmd) - sdhci_do_reset(host, SDHCI_RESET_CMD); - sdhci_do_reset(host, SDHCI_RESET_DATA); - } - /* * 'cap_cmd_during_tfr' request must not use the command line * after mmc_command_done() has been called. It is upper layer's @@ -2642,7 +2640,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t) * * \*****************************************************************************/ -static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask) +static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p) { if (!host->cmd) { /* @@ -2665,20 +2663,12 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask) else host->cmd->error = -EILSEQ; - /* - * If this command initiates a data phase and a response - * CRC error is signalled, the card can start transferring - * data - the card may have received the command without - * error. We must not terminate the mmc_request early. - * - * If the card did not receive the command or returned an - * error which prevented it sending data, the data phase - * will time out. - */ + /* Treat data command CRC error the same as data CRC error */ if (host->cmd->data && (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) == SDHCI_INT_CRC) { host->cmd = NULL; + *intmask_p |= SDHCI_INT_DATA_CRC; return; } @@ -2906,7 +2896,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id) } if (intmask & SDHCI_INT_CMD_MASK) - sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK); + sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask); if (intmask & SDHCI_INT_DATA_MASK) sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK); -- 2.7.4