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authorAaron Lu <aaron.lu@amd.com>2012-06-29 16:17:31 +0800
committerChris Ball <cjb@laptop.org>2012-07-22 15:25:47 -0400
commitb67c6b411dcf17199e1dfdf18da8b1c6caf73e6e (patch)
tree157df99c38f12e04aec8480d468b8fc648b84ac2 /drivers/mmc
parent473b095a72a95ba719905b1f2e82cd18d099a427 (diff)
downloadlinux-b67c6b411dcf17199e1dfdf18da8b1c6caf73e6e.tar.bz2
mmc: sdhci: restore host settings when card is removed
Some of the host settings are affected by different cards inserted, e.g. when an UHS-I card is inserted, the SDHCI_NEEDS_RETUING flag might be set when the tuning timer expired and host's max_blk_count will be reduced to make sure the data transfer for a command does not exceed 4MiB to meet the retuning mode 1's requirement. When the card is removed, we should restore the original setting of the host since we can't be sure the next card being inserted will still be an UHS-I card that needs tuning. The original setting include its max_blk_count and no set of the flag of SDHCI_NEEDS_RETUNING. Signed-off-by: Aaron Lu <aaron.lu@amd.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 12015151fab9..b0a5629dea3e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -245,6 +245,18 @@ static void sdhci_init(struct sdhci_host *host, int soft)
static void sdhci_reinit(struct sdhci_host *host)
{
sdhci_init(host, 0);
+ /*
+ * Retuning stuffs are affected by different cards inserted and only
+ * applicable to UHS-I cards. So reset these fields to their initial
+ * value when card is removed.
+ */
+ if (host->version >= SDHCI_SPEC_300 && host->tuning_count &&
+ host->tuning_mode == SDHCI_TUNING_MODE_1) {
+ 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);
}