Message ID | 1438771122-8601-6-git-send-email-haibo.chen@freescale.com (mailing list archive) |
---|---|
State | New, archived |
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Return-Path: <linux-mmc-owner@kernel.org> X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id BBA8AC05AC for <patchwork-linux-mmc@patchwork.kernel.org>; Wed, 5 Aug 2015 10:36:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DCE1B203E5 for <patchwork-linux-mmc@patchwork.kernel.org>; Wed, 5 Aug 2015 10:36:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F0607203E1 for <patchwork-linux-mmc@patchwork.kernel.org>; Wed, 5 Aug 2015 10:36:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752547AbbHEKgY (ORCPT <rfc822;patchwork-linux-mmc@patchwork.kernel.org>); Wed, 5 Aug 2015 06:36:24 -0400 Received: from mail-by2on0101.outbound.protection.outlook.com ([207.46.100.101]:21856 "EHLO na01-by2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751867AbbHEKgT (ORCPT <rfc822;linux-mmc@vger.kernel.org>); 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Wed, 5 Aug 2015 10:36:16 +0000 Received: from b51421-server.ap.freescale.net (b51421-server.ap.freescale.net [10.193.102.57]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id t75AZe9L026522; Wed, 5 Aug 2015 03:36:11 -0700 From: Haibo Chen <haibo.chen@freescale.com> To: <robh+dt@kernel.org>, <pawel.moll@arm.com>, <mark.rutland@arm.com>, <ijc+devicetree@hellion.org.uk>, <galak@codeaurora.org>, <shawnguo@kernel.org>, <kernel@pengutronix.de>, <linux@arm.linux.org.uk>, <ulf.hansson@linaro.org>, <aisheng.dong@freescale.com> CC: <haibo.chen@freescale.com>, <johan.derycke@barco.com>, <mkl@pengutronix.de>, <fabio.estevam@freescale.com>, <b29396@freescale.com>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-mmc@vger.kernel.org> Subject: [PATCH v4 5/6] mmc: sdhci-esdhc-imx: change default watermark level and burst length Date: Wed, 5 Aug 2015 18:38:41 +0800 Message-ID: <1438771122-8601-6-git-send-email-haibo.chen@freescale.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438771122-8601-1-git-send-email-haibo.chen@freescale.com> References: <1438771122-8601-1-git-send-email-haibo.chen@freescale.com> X-EOPAttributedMessage: 0 X-Microsoft-Exchange-Diagnostics: 1; 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diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 803d24f..97aa944 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -1160,7 +1160,8 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) * to something insane. Change it back here. */ if (esdhc_is_usdhc(imx_data)) { - writel(0x08100810, host->ioaddr + ESDHC_WTMK_LVL); + writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL); + host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN; host->mmc->caps |= MMC_CAP_1_8V_DDR;
By default, for all imx SoC types, the watermark level is 16, and the burst length is 8. But if the SDIO/SD/MMC I/O speed is fast enough, this default watermark level and burst length will be the performance bottleneck. For example, i.MX7D support eMMC HS400 mode, this mode can run in 8 bit, 200MHZ DDR mode. So the I/O speed improve a lot compare to SD3.0. The default burst length is 8, if we don't change this value, in HS400 mode, when we do eMMC read operation, we can find that the clock signal will stop for a period of time. This means the speed of data moving on AHB bus is slower than I/O speed. So we should improve the speed of data moving on AHB bus. This patch set the default burst length as 16, and set the default watermark level as 64. The test result is the clock signal has no stop during the eMMC HS400 operation. Signed-off-by: Haibo Chen <haibo.chen@freescale.com> --- drivers/mmc/host/sdhci-esdhc-imx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)