From: Kevin Wells <[email protected]> Enable I2C peripheral clocking at the start of a transfer and disable on transfer completion to reduce peripheral power use when bus is not in use.
Signed-off-by: Kevin Wells <[email protected]> --- drivers/i2c/busses/i2c-pnx.c | 33 +++++++-------------------------- 1 files changed, 7 insertions(+), 26 deletions(-) diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c index 6bb6ff7..23bd556 100644 --- a/drivers/i2c/busses/i2c-pnx.c +++ b/drivers/i2c/busses/i2c-pnx.c @@ -448,6 +448,8 @@ i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) "%s(): entering: %d messages, stat = %04x.\n", __func__, num, ioread32(I2C_REG_STS(alg_data))); + clk_enable(alg_data->clk); + bus_reset_if_active(alg_data); /* Process transactions in a loop. */ @@ -516,6 +518,8 @@ i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) bus_reset_if_active(alg_data); + clk_disable(alg_data->clk); + /* Cleanup to be sure... */ alg_data->mif.buf = NULL; alg_data->mif.len = 0; @@ -539,29 +543,6 @@ static struct i2c_algorithm pnx_algorithm = { .functionality = i2c_pnx_func, }; -#ifdef CONFIG_PM -static int i2c_pnx_controller_suspend(struct platform_device *pdev, - pm_message_t state) -{ - struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev); - - /* FIXME: shouldn't this be clk_disable? */ - clk_enable(alg_data->clk); - - return 0; -} - -static int i2c_pnx_controller_resume(struct platform_device *pdev) -{ - struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev); - - return clk_enable(alg_data->clk); -} -#else -#define i2c_pnx_controller_suspend NULL -#define i2c_pnx_controller_resume NULL -#endif - static int __devinit i2c_pnx_probe(struct platform_device *pdev) { unsigned long tmp; @@ -665,6 +646,9 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n", alg_data->adapter.name, i2c_pnx->base, i2c_pnx->irq); + /* Disable clock until needed */ + clk_disable(alg_data->clk); + return 0; out_irq: @@ -692,7 +676,6 @@ static int __devexit i2c_pnx_remove(struct platform_device *pdev) free_irq(i2c_pnx->irq, alg_data); i2c_del_adapter(&alg_data->adapter); - clk_disable(alg_data->clk); iounmap(alg_data->ioaddr); release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE); clk_put(alg_data->clk); @@ -709,8 +692,6 @@ static struct platform_driver i2c_pnx_driver = { }, .probe = i2c_pnx_probe, .remove = __devexit_p(i2c_pnx_remove), - .suspend = i2c_pnx_controller_suspend, - .resume = i2c_pnx_controller_resume, }; static int __init i2c_adap_pnx_init(void) -- 1.6.6 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
