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Commit 81e49922 authored by Jerry Huang's avatar Jerry Huang Committed by Chris Ball
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mmc: esdhc: add PIO mode support 



For some FSL ESDHC controllers (e.g. P2020E, Rev1.0), the SDHC can not
work on DMA mode because of the hardware bug, so we set a broken dma flag
and use PIO mode.

Signed-off-by: default avatarJerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: default avatarGao Guanhua <B22826@freescale.com>
Acked-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 2c4967f7

drivers/mmc/host/sdhci-pltfm.c

+4 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
 * sdhci-pltfm.c Support for SDHCI platform devices

 * Copyright (c) 2009 Intel Corporation

 *

 * Copyright (c) 2007 Freescale Semiconductor, Inc.

 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.

 * Copyright (c) 2009 MontaVista Software, Inc.

 *

 * Authors: Xiaobo Xie <X.Xie@freescale.com>
@@ -71,6 +71,9 @@ void sdhci_get_of_property(struct platform_device *pdev) 
		if (sdhci_of_wp_inverted(np))

			host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;



		if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))

			host->quirks |= SDHCI_QUIRK_BROKEN_DMA;



		clk = of_get_property(np, "clock-frequency", &size);

		if (clk && size == sizeof(*clk) && *clk)

			pltfm_host->clock = be32_to_cpup(clk);