mmc: esdhc: add PIO mode support
authorJerry Huang <Chang-Ming.Huang@freescale.com>
Mon, 16 Jan 2012 06:13:03 +0000 (14:13 +0800)
committerChris Ball <cjb@laptop.org>
Tue, 14 Feb 2012 01:38:59 +0000 (20:38 -0500)
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: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Gao Guanhua <B22826@freescale.com>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
drivers/mmc/host/sdhci-pltfm.c

index 03970bcb3495ee7f542a12fc118074635dcd78ff..67b9ab075deebe9a8f4d00f3fa0866b1570512ea 100644 (file)
@@ -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);