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>

diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c
index 4220aad..8fdf530 100644 (file)
--- 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;
 }