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Commit 808f1037 authored by Linus Walleij's avatar Linus Walleij Committed by Grant Likely
Browse files

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: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent ecd442fd

drivers/spi/amba-pl022.c

+13 −4
Original line number Diff line number Diff line
@@ -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;

}