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: <johan.derycke@barco.com>, <haibo.chen@freescale.com>,
        <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 v3 6/6] mmc: sdhci-esdhc-imx: set back the burst_length_enable bit to 1
Date: Wed, 29 Jul 2015 17:03:57 +0800
Message-ID: <1438160637-28061-7-git-send-email-haibo.chen@freescale.com>
In-Reply-To: <1438160637-28061-1-git-send-email-haibo.chen@freescale.com>
References: <1438160637-28061-1-git-send-email-haibo.chen@freescale.com>
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Currently we find that if a usdhc is choosed to boot system, then ROM
code will set the burst length enable bit of this usdhc as 0.

This will make performance drop a lot if this usdhc's burst length is
16. So this patch set back the burst_length_enable bit as 1, which is
the default value, and means burst length is enabled for INCR.

Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 37d0095..dd945e5 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -32,6 +32,7 @@
 #include "sdhci-esdhc.h"
 
 #define	ESDHC_CTRL_D3CD			0x08
+#define ESDHC_BURST_LEN_EN_INCR		(1 << 27)
 /* VENDOR SPEC register */
 #define ESDHC_VENDOR_SPEC		0xc0
 #define  ESDHC_VENDOR_SPEC_SDIO_QUIRK	(1 << 1)
@@ -1158,6 +1159,16 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 		host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
 		host->mmc->caps |= MMC_CAP_1_8V_DDR;
 
+		/*
+		 * ROM code will change the burst_length_enable setting to
+		 * zero if this usdhc is choosed to boot system. Change it
+		 * back here, otherwise it will impact the performance a
+		 * lot if the burst length is 16.
+		 */
+		writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
+			| ESDHC_BURST_LEN_EN_INCR,
+			host->ioaddr + SDHCI_HOST_CONTROL);
+
 		if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
 			host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
 
-- 
1.9.1

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