3.16.62-rc1 review patch. If anyone has any objections, please let me know.
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From: Daniel Mack daniel@zonque.org
commit 7444a8092906ed44c09459780c56ba57043e39b1 upstream.
Prior to commit 573185cc7e64 ("mmc: core: Invoke sdio func driver's PM callbacks from the sdio bus"), the MMC core used to call into the power management functions of SDIO clients itself and removed the card if the return code was non-zero. IOW, the mmc handled errors gracefully and didn't upchain them to the pm core.
Since this change, the mmc core relies on generic power management functions which treat all errors as a reason to cancel the suspend immediately. This causes suspend attempts to fail when the libertas driver is loaded.
To fix this, power down the card explicitly in if_sdio_suspend() when we know we're about to lose power and return success. Also set a flag in these cases, and power up the card again in if_sdio_resume().
Fixes: 573185cc7e64 ("mmc: core: Invoke sdio func driver's PM callbacks from the sdio bus") Signed-off-by: Daniel Mack daniel@zonque.org Reviewed-by: Chris Ball chris@printf.net Reviewed-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Kalle Valo kvalo@codeaurora.org [bwh: Backported to 3.16: adjust filenames] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/net/wireless/libertas/dev.h | 1 + drivers/net/wireless/libertas/if_sdio.c | 30 +++++++++++++++---- 2 files changed, 25 insertions(+), 6 deletions(-)
--- a/drivers/net/wireless/libertas/dev.h +++ b/drivers/net/wireless/libertas/dev.h @@ -102,6 +102,7 @@ struct lbs_private { u8 fw_ready; u8 surpriseremoved; u8 setup_fw_on_resume; + u8 power_up_on_resume; int (*hw_host_to_card) (struct lbs_private *priv, u8 type, u8 *payload, u16 nb); void (*reset_card) (struct lbs_private *priv); int (*power_save) (struct lbs_private *priv); --- a/drivers/net/wireless/libertas/if_sdio.c +++ b/drivers/net/wireless/libertas/if_sdio.c @@ -1342,15 +1342,23 @@ static void if_sdio_remove(struct sdio_f static int if_sdio_suspend(struct device *dev) { struct sdio_func *func = dev_to_sdio_func(dev); - int ret; struct if_sdio_card *card = sdio_get_drvdata(func); + struct lbs_private *priv = card->priv; + int ret;
mmc_pm_flag_t flags = sdio_get_host_pm_caps(func); + priv->power_up_on_resume = false;
/* If we're powered off anyway, just let the mmc layer remove the * card. */ - if (!lbs_iface_active(card->priv)) - return -ENOSYS; + if (!lbs_iface_active(priv)) { + if (priv->fw_ready) { + priv->power_up_on_resume = true; + if_sdio_power_off(card); + } + + return 0; + }
dev_info(dev, "%s: suspend: PM flags = 0x%x\n", sdio_func_id(func), flags); @@ -1358,9 +1366,14 @@ static int if_sdio_suspend(struct device /* If we aren't being asked to wake on anything, we should bail out * and let the SD stack power down the card. */ - if (card->priv->wol_criteria == EHS_REMOVE_WAKEUP) { + if (priv->wol_criteria == EHS_REMOVE_WAKEUP) { dev_info(dev, "Suspend without wake params -- powering down card\n"); - return -ENOSYS; + if (priv->fw_ready) { + priv->power_up_on_resume = true; + if_sdio_power_off(card); + } + + return 0; }
if (!(flags & MMC_PM_KEEP_POWER)) { @@ -1373,7 +1386,7 @@ static int if_sdio_suspend(struct device if (ret) return ret;
- ret = lbs_suspend(card->priv); + ret = lbs_suspend(priv); if (ret) return ret;
@@ -1388,6 +1401,11 @@ static int if_sdio_resume(struct device
dev_info(dev, "%s: resume: we're back\n", sdio_func_id(func));
+ if (card->priv->power_up_on_resume) { + if_sdio_power_on(card); + wait_event(card->pwron_waitq, card->priv->fw_ready); + } + ret = lbs_resume(card->priv);
return ret;