diff options
| author | Linus Walleij <linus.walleij@stericsson.com> | 2011-02-08 13:03:32 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-02-15 15:09:02 -0700 |
| commit | 808f1037ab3fbf75d25026ad8e175c57927cdb3a (patch) | |
| tree | f92cc4e1f9b41e75f41df1caa4f43bd874a426c9 /drivers/spi | |
| parent | ecd442fd9e388a31d382a62fb43e851048c282e1 (diff) | |
| download | linux-808f1037ab3fbf75d25026ad8e175c57927cdb3a.tar.bz2 | |
spi/pl022: disable core voltage when idle
This utilizes the new core voltage switch to power off the PL022
core voltage when it's not in use transmitting packets, if and
only if a core voltage switch is available.
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/amba-pl022.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c index 4220aad42840..8fdf530f9f50 100644 --- a/drivers/spi/amba-pl022.c +++ b/drivers/spi/amba-pl022.c @@ -508,9 +508,10 @@ static void giveback(struct pl022 *pl022) msg->state = NULL; if (msg->complete) msg->complete(msg->context); - /* This message is completed, so let's turn off the clocks! */ + /* This message is completed, so let's turn off the clocks & power */ clk_disable(pl022->clk); amba_pclk_disable(pl022->adev); + amba_vcore_disable(pl022->adev); } /** @@ -1475,9 +1476,11 @@ static void pump_messages(struct work_struct *work) /* Setup the SPI using the per chip configuration */ pl022->cur_chip = spi_get_ctldata(pl022->cur_msg->spi); /* - * We enable the clocks here, then the clocks will be disabled when - * giveback() is called in each method (poll/interrupt/DMA) + * We enable the core voltage and clocks here, then the clocks + * and core will be disabled when giveback() is called in each method + * (poll/interrupt/DMA) */ + amba_vcore_enable(pl022->adev); amba_pclk_enable(pl022->adev); clk_enable(pl022->clk); restore_state(pl022); @@ -2123,8 +2126,12 @@ pl022_probe(struct amba_device *adev, struct amba_id *id) goto err_spi_register; } dev_dbg(dev, "probe succeded\n"); - /* Disable the silicon block pclk and clock it when needed */ + /* + * Disable the silicon block pclk and any voltage domain and just + * power it up and clock it when it's needed + */ amba_pclk_disable(adev); + amba_vcore_disable(adev); return 0; err_spi_register: @@ -2189,9 +2196,11 @@ static int pl022_suspend(struct amba_device *adev, pm_message_t state) return status; } + amba_vcore_enable(adev); amba_pclk_enable(adev); load_ssp_default_config(pl022); amba_pclk_disable(adev); + amba_vcore_disable(adev); dev_dbg(&adev->dev, "suspended\n"); return 0; } |