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authorAbhilash Kesavan <a.kesavan@samsung.com>2012-11-19 10:26:21 +0530
committerChris Ball <cjb@laptop.org>2012-12-06 13:54:54 -0500
commitab269128a2cff7abee06f023e6466fc29991738c (patch)
treeb6b75ebec2cad581d36a0bfc0ed9ad7e19f9e711 /drivers/mmc
parentf5ccfd4174639119664b6d76495ea1388f13b838 (diff)
downloadlinux-ab269128a2cff7abee06f023e6466fc29991738c.tar.bz2
mmc: dw_mmc: Add sdio power bindings
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/dw_mmc.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 5b4134811c90..73420296b268 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -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;