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mmc: dw_mmc: Add sdio power bindings

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Add dt-based retrieval of host sdio pm capabilities. Based on
the dt based discovery do a bus init in the resume function.

Signed-off-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Abhilash Kesavan 2012-11-19 10:26:21 +05:30 committed by Chris Ball
parent f5ccfd4174
commit ab269128a2
2 changed files with 18 additions and 3 deletions
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20
drivers/mmc/host/dw_mmc.c
View File

@ -617,13 +617,13 @@ static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg)
cmd, arg, cmd_status);
}
static void dw_mci_setup_bus(struct dw_mci_slot *slot)
static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
{
struct dw_mci *host = slot->host;
u32 div;
u32 clk_en_a;
if (slot->clock != host->current_speed) {
if (slot->clock != host->current_speed || force_clkinit) {
div = host->bus_hz / slot->clock;
if (host->bus_hz % slot->clock && host->bus_hz > slot->clock)
/*
@ -684,7 +684,7 @@ static void __dw_mci_start_request(struct dw_mci *host,
host->pdata->select_slot(slot->id);
/* Slot specific timing and width adjustment */
dw_mci_setup_bus(slot);
dw_mci_setup_bus(slot, false);
host->cur_slot = slot;
host->mrq = mrq;
@ -1850,6 +1850,9 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
if (host->pdata->caps)
mmc->caps = host->pdata->caps;
if (host->pdata->pm_caps)
mmc->pm_caps = host->pdata->pm_caps;
if (host->dev->of_node) {
ctrl_id = of_alias_get_id(host->dev->of_node, "mshc");
if (ctrl_id < 0)
@ -2072,6 +2075,12 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
return ERR_PTR(ret);
}
if (of_find_property(np, "keep-power-in-suspend", NULL))
pdata->pm_caps |= MMC_PM_KEEP_POWER;
if (of_find_property(np, "enable-sdio-wakeup", NULL))
pdata->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
return pdata;
}
@ -2411,6 +2420,11 @@ int dw_mci_resume(struct dw_mci *host)
struct dw_mci_slot *slot = host->slot[i];
if (!slot)
continue;
if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) {
dw_mci_set_ios(slot->mmc, &slot->mmc->ios);
dw_mci_setup_bus(slot, true);
}
ret = mmc_resume_host(host->slot[i]->mmc);
if (ret < 0)
return ret;

1
include/linux/mmc/dw_mmc.h
View File

@ -231,6 +231,7 @@ struct dw_mci_board {
u32 caps; /* Capabilities */
u32 caps2; /* More capabilities */
u32 pm_caps; /* PM capabilities */
/*
* Override fifo depth. If 0, autodetect it from the FIFOTH register,
* but note that this may not be reliable after a bootloader has used