mmc: esdhc: Fix DMA_MASK to not break mx25 DMA access

Patch to not set reserved bits in i.MX25 PROCTL register.  DMA stops
working if those bits get set.

Signed-off-by: Wilson Callan <wilson.callan@savantsystems.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index ebbe984..e23f813 100644 (file)
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -299,6 +299,8 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
 
 static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
 {
+       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+       struct pltfm_imx_data *imx_data = pltfm_host->priv;
        u32 new_val;
 
        switch (reg) {
@@ -315,8 +317,11 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
                                SDHCI_CTRL_D3CD);
                /* ensure the endianess */
                new_val |= ESDHC_HOST_CONTROL_LE;
-               /* DMA mode bits are shifted */
-               new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
+               /* bits 8&9 are reserved on mx25 */
+               if (!is_imx25_esdhc(imx_data)) {
+                       /* DMA mode bits are shifted */
+                       new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
+               }
 
                esdhc_clrset_le(host, 0xffff, new_val, reg);
                return;