diff options
Diffstat (limited to 'drivers/mmc/host/mmci.c')
| -rw-r--r-- | drivers/mmc/host/mmci.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index e3d67089265..368f855ceac 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -789,6 +789,14 @@ mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c) if (/*interrupt*/0) c |= MCI_CPSM_INTERRUPT; + /* + * For levelshifters we must not use more than 25MHz when + * sending commands. + */ + host->cclk_desired = host->cclk; + if (host->plat->ios_handler && (host->cclk_desired > 25000000)) + mmci_set_clkreg(host, 25000000); + host->cmd = cmd; writel(cmd->arg, base + MMCIARGUMENT); @@ -881,6 +889,13 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, cmd->resp[3] = readl(base + MMCIRESPONSE3); } + /* + * For levelshifters we might have decreased cclk to 25MHz when + * sending commands, then we restore the frequency here. + */ + if (host->plat->ios_handler && (host->cclk_desired > host->cclk)) + mmci_set_clkreg(host, host->cclk_desired); + if (!cmd->data || cmd->error) { /* Terminate the DMA transfer */ if (dma_inprogress(host)) { |