From patchwork Wed Dec 22 07:09:48 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philip Rakity X-Patchwork-Id: 426161 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oBM7BtZc021642 for ; Wed, 22 Dec 2010 07:12:46 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752413Ab0LVHMp (ORCPT ); Wed, 22 Dec 2010 02:12:45 -0500 Received: from na3sys009aog106.obsmtp.com ([74.125.149.77]:49703 "HELO na3sys009aog106.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752301Ab0LVHMp (ORCPT ); Wed, 22 Dec 2010 02:12:45 -0500 Received: from source ([65.219.4.129]) (using TLSv1) by na3sys009aob106.postini.com ([74.125.148.12]) with SMTP ID DSNKTRGk7DFhsvQU0H14I6pCnSWofLUh3Bts@postini.com; Tue, 21 Dec 2010 23:12:45 PST Received: from SC-vEXCH3.marvell.com ([10.93.76.133]) by SC-OWA01.marvell.com ([10.93.76.21]) with mapi; Tue, 21 Dec 2010 23:09:49 -0800 From: Philip Rakity To: "linux-mmc@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" CC: Mark Brown Date: Tue, 21 Dec 2010 23:09:48 -0800 Subject: [PATCH 14/23] Alternative mmc structure to support pxa168, pxa910, mmp2 family SD Thread-Topic: [PATCH 14/23] Alternative mmc structure to support pxa168, pxa910, mmp2 family SD Thread-Index: Acuhpzhr1YufbRTTR8GljfHsAu3MBw== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: en-US MIME-Version: 1.0 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Wed, 22 Dec 2010 07:12:46 +0000 (UTC) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6486009..ff9d5f0 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -922,6 +922,14 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) mdelay(1); } + /* + * we cannot talk to controller for 8 bus cycles according to sdio spec + * at lowest speed this is 100,000 HZ per cycle or 800,000 cycles + * which is quite a LONG TIME on a fast cpu -- so delay if needed + */ + if (host->ops->platform_specific_delay) + host->ops->platform_specific_delay(host); + mod_timer(&host->timer, jiffies + 10 * HZ); host->cmd = cmd; diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index a8c43c9..91749dc 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -225,6 +225,7 @@ struct sdhci_ops { void (*platform_reset_enter)(struct sdhci_host *host, u8 mask); void (*platform_reset_exit)(struct sdhci_host *host, u8 mask); unsigned int (*get_f_max_clock)(struct sdhci_host *host); + void (*platform_specific_delay)(struct sdhci_host *host); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS