1 files changed, 19 insertions, 6 deletions

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 3c5483b75da4..9702ad3774cf 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -180,7 +180,15 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
         else
                 DALGN &= ~(1 << host->dma);
         DDADR(host->dma) = host->sg_dma;
-        DCSR(host->dma) = DCSR_RUN;
+
+        /*
+         * workaround for erratum #91:
+         * only start DMA now if we are doing a read,
+         * otherwise we wait until CMD/RESP has finished
+         * before starting DMA.
+         */
+        if (!cpu_is_pxa27x() || data->flags & MMC_DATA_READ)
+                DCSR(host->dma) = DCSR_RUN;
 }
 
 static void pxamci_start_cmd(struct pxamci_host *host, struct mmc_command *cmd, unsigned int cmdat)
@@ -251,23 +259,28 @@ static int pxamci_cmd_done(struct pxamci_host *host, unsigned int stat)
         if (stat & STAT_TIME_OUT_RESPONSE) {
                 cmd->error = -ETIMEDOUT;
         } else if (stat & STAT_RES_CRC_ERR && cmd->flags & MMC_RSP_CRC) {
-#ifdef CONFIG_PXA27x
                 /*
                  * workaround for erratum #42:
                  * Intel PXA27x Family Processor Specification Update Rev 001
                  * A bogus CRC error can appear if the msb of a 136 bit
                  * response is a one.
                  */
-                if (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000) {
+                if (cpu_is_pxa27x() &&
+                    (cmd->flags & MMC_RSP_136 && cmd->resp[0] & 0x80000000))
                         pr_debug("ignoring CRC from command %d - *risky*\n", cmd->opcode);
-                } else
-#endif
-                cmd->error = -EILSEQ;
+                else
+                        cmd->error = -EILSEQ;
         }
 
         pxamci_disable_irq(host, END_CMD_RES);
         if (host->data && !cmd->error) {
                 pxamci_enable_irq(host, DATA_TRAN_DONE);
+                /*
+                 * workaround for erratum #91, if doing write
+                 * enable DMA late
+                 */
+                if (cpu_is_pxa27x() && host->data->flags & MMC_DATA_WRITE)
+                        DCSR(host->dma) = DCSR_RUN;
         } else {
                 pxamci_finish_request(host, host->mrq);
         }