MMC: Use timeout values from CSR

Hard-coded timeout values of 250ms for writes and 100ms for reads are
currently used for MMC transactions over SPI. The spec states that the
timeout values from the card should be used.

Signed-off-by: Matthew Fleming <matthew.fleming@imgtec.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 7503b81..07faf54 100644 (file)
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -95,8 +95,6 @@
  * reads which takes nowhere near that long.  Older cards may be able to use
  * shorter timeouts ... but why bother?
  */
-#define readblock_timeout      ktime_set(0, 100 * 1000 * 1000)
-#define writeblock_timeout     ktime_set(0, 250 * 1000 * 1000)
 #define r1b_timeout            ktime_set(3, 0)
 
 
@@ -220,9 +218,9 @@ mmc_spi_wait_unbusy(struct mmc_spi_host *host, ktime_t timeout)
        return mmc_spi_skip(host, timeout, sizeof(host->data->status), 0);
 }
 
-static int mmc_spi_readtoken(struct mmc_spi_host *host)
+static int mmc_spi_readtoken(struct mmc_spi_host *host, ktime_t timeout)
 {
-       return mmc_spi_skip(host, readblock_timeout, 1, 0xff);
+       return mmc_spi_skip(host, timeout, 1, 0xff);
 }
 
 
@@ -605,7 +603,8 @@ mmc_spi_setup_data_message(
  * Return negative errno, else success.
  */
 static int
-mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t)
+mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t,
+       ktime_t timeout)
 {
        struct spi_device       *spi = host->spi;
        int                     status, i;
@@ -673,7 +672,7 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t)
                if (scratch->status[i] != 0)
                        return 0;
        }
-       return mmc_spi_wait_unbusy(host, writeblock_timeout);
+       return mmc_spi_wait_unbusy(host, timeout);
 }
 
 /*
@@ -693,7 +692,8 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t)
  * STOP_TRANSMISSION command.
  */
 static int
-mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t)
+mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t,
+       ktime_t timeout)
 {
        struct spi_device       *spi = host->spi;
        int                     status;
@@ -707,7 +707,7 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t)
                return status;
        status = scratch->status[0];
        if (status == 0xff || status == 0)
-               status = mmc_spi_readtoken(host);
+               status = mmc_spi_readtoken(host, timeout);
 
        if (status == SPI_TOKEN_SINGLE) {
                if (host->dma_dev) {
@@ -778,6 +778,8 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
        struct scatterlist      *sg;
        unsigned                n_sg;
        int                     multiple = (data->blocks > 1);
+       u32                     clock_rate;
+       ktime_t                 timeout;
 
        if (data->flags & MMC_DATA_READ)
                direction = DMA_FROM_DEVICE;
@@ -786,6 +788,14 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
        mmc_spi_setup_data_message(host, multiple, direction);
        t = &host->t;
 
+       if (t->speed_hz)
+               clock_rate = t->speed_hz;
+       else
+               clock_rate = spi->max_speed_hz;
+
+       timeout = ktime_add_ns(ktime_set(0, 0), data->timeout_ns +
+                       data->timeout_clks * 1000000 / clock_rate);
+
        /* Handle scatterlist segments one at a time, with synch for
         * each 512-byte block
         */
@@ -832,9 +842,9 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
                                t->len);
 
                        if (direction == DMA_TO_DEVICE)
-                               status = mmc_spi_writeblock(host, t);
+                               status = mmc_spi_writeblock(host, t, timeout);
                        else
-                               status = mmc_spi_readblock(host, t);
+                               status = mmc_spi_readblock(host, t, timeout);
                        if (status < 0)
                                break;
 
@@ -917,7 +927,7 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
                        if (scratch->status[tmp] != 0)
                                return;
                }
-               tmp = mmc_spi_wait_unbusy(host, writeblock_timeout);
+               tmp = mmc_spi_wait_unbusy(host, timeout);
                if (tmp < 0 && !data->error)
                        data->error = tmp;
        }