mmc: sdhci: Tuning should not change max_blk_count

Re-tuning requires that the maximum data length
is limited to 4MiB. The code currently changes
max_blk_count in an attempt to achieve that.
This is wrong because max_blk_count is a different
limit, but it is also un-necessary because
max_req_size is 512KiB anyway. Consequently, the
changes to max_blk_count are removed and the
comment for max_req_size adjusted accordingly.
The comment is also tweaked to show that the 512KiB
limit is a SDMA limit not an ADMA limit.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index cbb245b58538..040158d4fc9a 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -259,8 +259,6 @@ static void sdhci_reinit(struct sdhci_host *host)
 
                 del_timer_sync(&host->tuning_timer);
                 host->flags &= ~SDHCI_NEEDS_RETUNING;
-                host->mmc->max_blk_count =
-                        (host->quirks & SDHCI_QUIRK_NO_MULTIBLOCK) ? 1 : 65535;
         }
         sdhci_enable_card_detection(host);
 }
@@ -2048,8 +2046,6 @@ out:
                 host->flags |= SDHCI_USING_RETUNING_TIMER;
                 mod_timer(&host->tuning_timer, jiffies +
                         host->tuning_count * HZ);
-                /* Tuning mode 1 limits the maximum data length to 4MB */
-                mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
         } else if (host->flags & SDHCI_USING_RETUNING_TIMER) {
                 host->flags &= ~SDHCI_NEEDS_RETUNING;
                 /* Reload the new initial value for timer */
@@ -3260,8 +3256,9 @@ int sdhci_add_host(struct sdhci_host *host)
                 mmc->max_segs = SDHCI_MAX_SEGS;
 
         /*
-         * Maximum number of sectors in one transfer. Limited by DMA boundary
-         * size (512KiB).
+         * Maximum number of sectors in one transfer. Limited by SDMA boundary
+         * size (512KiB). Note some tuning modes impose a 4MiB limit, but this
+         * is less anyway.
          */
         mmc->max_req_size = 524288;