From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mo2.mail-out.ovh.net ([178.32.228.2]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1Tyl3m-0007od-8Q for barebox@lists.infradead.org; Fri, 25 Jan 2013 15:19:24 +0000 Received: from mail436.ha.ovh.net (b6.ovh.net [213.186.33.56]) by mo2.mail-out.ovh.net (Postfix) with SMTP id 11C4CDC1D06 for ; Fri, 25 Jan 2013 16:29:06 +0100 (CET) From: Jean-Christophe PLAGNIOL-VILLARD Date: Fri, 25 Jan 2013 16:17:41 +0100 Message-Id: <1359127067-30079-8-git-send-email-plagnioj@jcrosoft.com> In-Reply-To: <1359127067-30079-1-git-send-email-plagnioj@jcrosoft.com> References: <20130125151448.GD26329@game.jcrosoft.org> <1359127067-30079-1-git-send-email-plagnioj@jcrosoft.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 08/14] atmel_mci: rwproof is only needed since IP version 0x200 To: barebox@lists.infradead.org Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- drivers/mci/atmel_mci.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/mci/atmel_mci.c b/drivers/mci/atmel_mci.c index d5fdd1d..bf0adb0 100644 --- a/drivers/mci/atmel_mci.c +++ b/drivers/mci/atmel_mci.c @@ -28,6 +28,7 @@ #include "atmel-mci-regs.h" struct atmel_mci_caps { + bool has_rwproof; bool has_odd_clk_div; }; @@ -94,7 +95,13 @@ static void atmci_set_clk_rate(struct atmel_mci *host, dev_dbg(host->hw_dev, "atmel_set_clk_rate: clkIn=%ld clkIos=%d divider=%d\n", host->bus_hz, clock_min, clkdiv); - host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF; + /* + * WRPROOF and RDPROOF prevent overruns/underruns by + * stopping the clock when the FIFO is full/empty. + * This state is not expected to last for long. + */ + if (host->caps.has_rwproof) + host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF; atmci_writel(host, ATMCI_MR, host->mode_reg); } @@ -470,6 +477,7 @@ static void atmci_get_cap(struct atmel_mci *host) case 0x400: case 0x300: case 0x200: + host->caps.has_rwproof = 1; case 0x100: case 0x0: break; -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox