diff options
| author | Sahitya Tummala <stummala@codeaurora.org> | 2013-02-25 15:45:32 +0530 |
|---|---|---|
| committer | Subhash Jadavani <subhashj@codeaurora.org> | 2016-05-27 10:28:55 -0700 |
| commit | 29ff0494897e8afdf44d42e095174de1685eeb23 (patch) | |
| tree | 42e7406c7ebeabeeb5a4fd3e80da3352ae617f2b /drivers | |
| parent | f9359ba80e55fba4612d2b627c079bcc61e60444 (diff) | |
mmc: sdhci: Add new callback to enable/disable CDR
MSM SDHCI has CDR mechanism (clock-data recovery) to
automatically adjust the sampling point based on the
voltage/temperature variations. This must be enabled
for only read. Hence, add new host op toggle_cdr to
control CDR.
Change-Id: I75940cfca15fe88de6d46fe58cb33620a3b7ced1
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
[subhashj@codeaurora.org: fixed minor merge conflict]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 7 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 1 |
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 4930d9f09d7f..0a7a599588df 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1009,8 +1009,13 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, } } - if (data->flags & MMC_DATA_READ) + if (data->flags & MMC_DATA_READ) { mode |= SDHCI_TRNS_READ; + if (host->ops->toggle_cdr) + host->ops->toggle_cdr(host, true); + } + if (host->ops->toggle_cdr && (data->flags & MMC_DATA_WRITE)) + host->ops->toggle_cdr(host, false); if (host->flags & SDHCI_REQ_USE_DMA) mode |= SDHCI_TRNS_DMA; diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 6d8ddfc07fb5..1430ca98dd94 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -641,6 +641,7 @@ struct sdhci_ops { bool enable, u32 type); void (*dump_vendor_regs)(struct sdhci_host *host); + void (*toggle_cdr)(struct sdhci_host *host, bool enable); void (*voltage_switch)(struct sdhci_host *host); int (*select_drive_strength)(struct sdhci_host *host, struct mmc_card *card, |