From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dong Aisheng Subject: [PATCH v2 1/5] mmc: sdhci: add platfrom get_max_timeout_count hook Date: Tue, 17 Dec 2013 16:16:27 +0800 Message-ID: <1387268191-19859-2-git-send-email-b29396@freescale.com> References: <1387268191-19859-1-git-send-email-b29396@freescale.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from co1ehsobe006.messaging.microsoft.com ([216.32.180.189]:20606 "EHLO co1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751118Ab3LQIp6 (ORCPT ); Tue, 17 Dec 2013 03:45:58 -0500 In-Reply-To: <1387268191-19859-1-git-send-email-b29396@freescale.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, cjb@laptop.org, shawn.guo@linaro.org, s.hauer@pengutronix.de, b29396@freescale.com, ulf.hansson@linaro.org, adrian.hunter@intel.com, vladimir_zapolskiy@mentor.com, ed.sutter@alcatel-lucent.com Currently the max_discard_to is simply got by (1 << 27) / host->timeout_clk which is assumed to be the maximum timeout value, however, some platforms maximum timeout counter may not be 1 << 27, e.g. i.MX uSDHC is 1 << 28. Thus 1 << 27 may not be correct for such platforms. It is also possible that other platforms may have different problems. To be flexible, we add a get_max_timeout_count hook to get the correct maximum timeout value for these platforms. Signed-off-by: Dong Aisheng --- drivers/mmc/host/sdhci.c | 4 +++- drivers/mmc/host/sdhci.h | 1 + 2 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index cc00bed..7fef3bb 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2942,7 +2942,9 @@ int sdhci_add_host(struct sdhci_host *host) if (host->quirks & SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK) host->timeout_clk = mmc->f_max / 1000; - mmc->max_discard_to = (1 << 27) / host->timeout_clk; + mmc->max_discard_to = host->ops->get_max_timeout_count ? + host->ops->get_max_timeout_count(host) : 1 << 27; + mmc->max_discard_to /= host->timeout_clk; mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23; diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 0a3ed01..acba9a7 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -281,6 +281,7 @@ struct sdhci_ops { unsigned int (*get_max_clock)(struct sdhci_host *host); unsigned int (*get_min_clock)(struct sdhci_host *host); unsigned int (*get_timeout_clock)(struct sdhci_host *host); + unsigned int (*get_max_timeout_count)(struct sdhci_host *host); int (*platform_bus_width)(struct sdhci_host *host, int width); void (*platform_send_init_74_clocks)(struct sdhci_host *host, -- 1.7.2.rc3