diff options
| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2013-06-06 18:35:44 +0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-06-06 19:48:04 +0400 |
| commit | e83b7a8acc420923cbe8a30901d9eb60677f54fb (patch) | |
| tree | 27784dc589543f97678574af7c529c0b6c473b2d /drivers/mmc/host/tmio_mmc.h | |
| parent | 19f1ba51c79f133aec3ce558b8292e3b081363f3 (diff) | |
| download | linux-e83b7a8acc420923cbe8a30901d9eb60677f54fb.tar.xz | |
mmc: tmio: fix unbalanced power-on calls with clock-gating enabled
With MMC clock gating enabled the MMC core currently calls MMC host driver's
.set_ios() method with .power_mode == MMC_POWER_ON and the clock value set
either to 0 or to the target rate. The tmio MMC driver then wrongly
translates the latter calls to card slot power-on requests, even when the
slot already was on. This patch fixes the driver to avoid needlessly
incrementing power-supplying regulator's use count.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/tmio_mmc.h')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc.h | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index 759d8f4f130c..86fd21e00099 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -40,6 +40,22 @@ struct tmio_mmc_data; +/* + * We differentiate between the following 3 power states: + * 1. card slot powered off, controller stopped. This is used, when either there + * is no card in the slot, or the card really has to be powered down. + * 2. card slot powered on, controller stopped. This is used, when a card is in + * the slot, but no activity is currently taking place. This is a power- + * saving mode with card-state preserved. This state can be entered, e.g. + * when MMC clock-gating is used. + * 3. card slot powered on, controller running. This is the actual active state. + */ +enum tmio_mmc_power { + TMIO_MMC_OFF_STOP, /* card power off, controller stopped */ + TMIO_MMC_ON_STOP, /* card power on, controller stopped */ + TMIO_MMC_ON_RUN, /* card power on, controller running */ +}; + struct tmio_mmc_host { void __iomem *ctl; unsigned long bus_shift; @@ -48,8 +64,8 @@ struct tmio_mmc_host { struct mmc_data *data; struct mmc_host *mmc; - /* Controller power state */ - bool power; + /* Controller and card power state */ + enum tmio_mmc_power power; /* Callbacks for clock / power control */ void (*set_pwr)(struct platform_device *host, int state); |