From 6ebebeab5185f50d55c6a24d0abe47e5dac1b191 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 2 Nov 2016 15:49:08 +0200 Subject: [PATCH] mmc: sdhci: Fix CMD line reset interfering with ongoing data transfer CMD line reset during an ongoing data transfer can cause the data transfer to hang. Fix by delaying the reset until the data transfer is finished. Signed-off-by: Adrian Hunter Cc: stable@vger.kernel.org # v4.8+ Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 71654b9..fd0f24c 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2286,10 +2286,8 @@ static bool sdhci_request_done(struct sdhci_host *host) for (i = 0; i < SDHCI_MAX_MRQS; i++) { mrq = host->mrqs_done[i]; - if (mrq) { - host->mrqs_done[i] = NULL; + if (mrq) break; - } } if (!mrq) { @@ -2320,6 +2318,17 @@ static bool sdhci_request_done(struct sdhci_host *host) * upon error conditions. */ if (sdhci_needs_reset(host, mrq)) { + /* + * Do not finish until command and data lines are available for + * reset. Note there can only be one other mrq, so it cannot + * also be in mrqs_done, otherwise host->cmd and host->data_cmd + * would both be null. + */ + if (host->cmd || host->data_cmd) { + spin_unlock_irqrestore(&host->lock, flags); + return true; + } + /* Some controllers need this kick or reset won't work here */ if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) /* This is to force an update */ @@ -2327,10 +2336,8 @@ static bool sdhci_request_done(struct sdhci_host *host) /* Spec says we should do both at the same time, but Ricoh controllers do not like that. */ - if (!host->cmd) - sdhci_do_reset(host, SDHCI_RESET_CMD); - if (!host->data_cmd) - sdhci_do_reset(host, SDHCI_RESET_DATA); + sdhci_do_reset(host, SDHCI_RESET_CMD); + sdhci_do_reset(host, SDHCI_RESET_DATA); host->pending_reset = false; } @@ -2338,6 +2345,8 @@ static bool sdhci_request_done(struct sdhci_host *host) if (!sdhci_has_requests(host)) sdhci_led_deactivate(host); + host->mrqs_done[i] = NULL; + mmiowb(); spin_unlock_irqrestore(&host->lock, flags); -- 2.7.4