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authorDoug Anderson <dianders@chromium.org>2013-06-07 10:28:29 -0700
committerChris Ball <cjb@laptop.org>2013-06-27 12:39:06 -0400
commit870556a3dfb16d004f8e09dd59a1eddc727fcf0c (patch)
tree54c95bbaea975ad8cc85137fb6d72ec8b8f1f12b
parent0ddf03c95bbb4f4ed57281fa7b781472950df749 (diff)
downloadlinux-870556a3dfb16d004f8e09dd59a1eddc727fcf0c.tar.bz2
mmc: dw_mmc: Handle late vmmc regulators with EPROBE_DEFER
It is possible to specify a regulator that should be turned on when dw_mmc is probed. At the moment dw_mmc will fail to use the regulator properly if the regulator probes after dw_mmc. Fix this problem by honoring EPROBE_DEFER. At the same time move the regulator code out of the slot init code. We only specify one regulator for the whole device and other parts of the code (like suspend/resume) assume that the regulator has only been enabled once. Signed-off-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Chris Ball <cjb@laptop.org>
-rw-r--r--Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt4
-rw-r--r--drivers/mmc/host/dw_mmc.c34
2 files changed, 24 insertions, 14 deletions
diff --git a/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt
index 726fd2122a13..d5cc94ecd60e 100644
--- a/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt
+++ b/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt
@@ -55,6 +55,9 @@ Optional properties:
* broken-cd: as documented in mmc core bindings.
+* vmmc-supply: The phandle to the regulator to use for vmmc. If this is
+ specified we'll defer probe until we can find this regulator.
+
Aliases:
- All the MSHC controller nodes should be represented in the aliases node using
@@ -79,6 +82,7 @@ board specific portions as listed below.
broken-cd;
fifo-depth = <0x80>;
card-detect-delay = <200>;
+ vmmc-supply = <&buck8>;
slot@0 {
reg = <0>;
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 7dca5e92dcb4..957f5d7ea426 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1991,19 +1991,6 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
#endif /* CONFIG_MMC_DW_IDMAC */
}
- host->vmmc = devm_regulator_get(mmc_dev(mmc), "vmmc");
- if (IS_ERR(host->vmmc)) {
- pr_info("%s: no vmmc regulator found\n", mmc_hostname(mmc));
- host->vmmc = NULL;
- } else {
- ret = regulator_enable(host->vmmc);
- if (ret) {
- dev_err(host->dev,
- "failed to enable regulator: %d\n", ret);
- goto err_setup_bus;
- }
- }
-
if (dw_mci_get_cd(mmc))
set_bit(DW_MMC_CARD_PRESENT, &slot->flags);
else
@@ -2235,11 +2222,29 @@ int dw_mci_probe(struct dw_mci *host)
}
}
+ host->vmmc = devm_regulator_get(host->dev, "vmmc");
+ if (IS_ERR(host->vmmc)) {
+ ret = PTR_ERR(host->vmmc);
+ if (ret == -EPROBE_DEFER)
+ goto err_clk_ciu;
+
+ dev_info(host->dev, "no vmmc regulator found: %d\n", ret);
+ host->vmmc = NULL;
+ } else {
+ ret = regulator_enable(host->vmmc);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(host->dev,
+ "regulator_enable fail: %d\n", ret);
+ goto err_clk_ciu;
+ }
+ }
+
if (!host->bus_hz) {
dev_err(host->dev,
"Platform data must supply bus speed\n");
ret = -ENODEV;
- goto err_clk_ciu;
+ goto err_regulator;
}
host->quirks = host->pdata->quirks;
@@ -2386,6 +2391,7 @@ err_dmaunmap:
if (host->use_dma && host->dma_ops->exit)
host->dma_ops->exit(host);
+err_regulator:
if (host->vmmc)
regulator_disable(host->vmmc);