From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: [PATCH RFC 12/46] mmc: sdhci: Track whether a reset is pending Date: Thu, 9 Jun 2016 14:52:12 +0300 Message-ID: <1465473166-22532-13-git-send-email-adrian.hunter@intel.com> References: <1465473166-22532-1-git-send-email-adrian.hunter@intel.com> Return-path: Received: from mga01.intel.com ([192.55.52.88]:63235 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751052AbcFIL5y (ORCPT ); Thu, 9 Jun 2016 07:57:54 -0400 In-Reply-To: <1465473166-22532-1-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 , Alex Lemberg , Mateusz Nowak , Yuliy Izrailov , Jaehoon Chung , Dong Aisheng , Das Asutosh , Zhangfei Gao , Sujit Reddy Thumma , Dorfman Konstantin , David Griego , Sahitya Tummala , Harjani Ritesh SDHCI recovers from errors by resetting the cmd and data circuits. Until that is done, there very well might be more interrupts, so ignore them in that case. Signed-off-by: Adrian Hunter --- drivers/mmc/host/sdhci.c | 20 ++++++++++++++++++++ drivers/mmc/host/sdhci.h | 1 + 2 files changed, 21 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index f75c226de7ff..a1afcd9dd228 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -935,6 +935,9 @@ static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq) static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) { + if (sdhci_needs_reset(host, mrq)) + host->pending_reset = true; + tasklet_schedule(&host->finish_tasklet); } @@ -2226,6 +2229,8 @@ static void sdhci_tasklet_finish(unsigned long param) controllers do not like that. */ sdhci_do_reset(host, SDHCI_RESET_CMD); sdhci_do_reset(host, SDHCI_RESET_DATA); + + host->pending_reset = false; } host->mrq = NULL; @@ -2281,6 +2286,13 @@ static void sdhci_timeout_timer(unsigned long data) static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *mask) { if (!host->cmd) { + /* + * SDHCI recovers from errors by resetting the cmd and data + * circuits. Until that is done, there very well might be more + * interrupts, so ignore them in that case. + */ + if (host->pending_reset) + return; pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n", mmc_hostname(host->mmc), (unsigned)intmask); sdhci_dumpregs(host); @@ -2403,6 +2415,14 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask) } } + /* + * SDHCI recovers from errors by resetting the cmd and data + * circuits. Until that is done, there very well might be more + * interrupts, so ignore them in that case. + */ + if (host->pending_reset) + return; + pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n", mmc_hostname(host->mmc), (unsigned)intmask); sdhci_dumpregs(host); diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index d649dfd2f4d2..331a72b417ef 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -460,6 +460,7 @@ struct sdhci_host { bool runtime_suspended; /* Host is runtime suspended */ bool bus_on; /* Bus power prevents runtime suspend */ bool preset_enabled; /* Preset is enabled */ + bool pending_reset; /* Cmd/data reset is pending */ struct mmc_request *mrq; /* Current request */ struct mmc_command *cmd; /* Current command */ -- 1.9.1