From 5d5feb13c0973fbfb6fcc7c161dbfef60506fa8b Mon Sep 17 00:00:00 2001 From: Robin Gong Date: Thu, 12 Apr 2012 14:40:42 +0800 Subject: [PATCH] ENGR00179497-1 ECSPI: disable ecspi clock after probe and spi transfer before, it enable spi clock after probe, never been disable unless driver removed. To reduce power, disable clock after probe, and enable it before every spi transfer and disable it after spi transfer Signed-off-by: Robin Gong --- drivers/spi/spi_imx.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index eba760095956..be58e17dc526 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2004-2007, 2011 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2004-2007, 2012 Freescale Semiconductor, Inc. All Rights Reserved. * Copyright (C) 2008 Juergen Beisert * * This program is free software; you can redistribute it and/or @@ -652,6 +652,7 @@ static int spi_imx_setupxfer(struct spi_device *spi, struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); struct spi_imx_config config; + clk_enable(spi_imx->clk); config.bpw = t ? t->bits_per_word : spi->bits_per_word; config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; config.mode = spi->mode; @@ -678,7 +679,7 @@ static int spi_imx_setupxfer(struct spi_device *spi, BUG(); spi_imx->devtype_data.config(spi_imx, &config); - + clk_disable(spi_imx->clk); return 0; } @@ -687,6 +688,7 @@ static int spi_imx_transfer(struct spi_device *spi, { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + clk_enable(spi_imx->clk); spi_imx->tx_buf = transfer->tx_buf; spi_imx->rx_buf = transfer->rx_buf; spi_imx->count = transfer->len; @@ -699,6 +701,7 @@ static int spi_imx_transfer(struct spi_device *spi, spi_imx->devtype_data.intctrl(spi_imx, MXC_INT_TE); wait_for_completion(&spi_imx->xfer_done); + clk_disable(spi_imx->clk); return transfer->len; } @@ -863,12 +866,12 @@ static int __devinit spi_imx_probe(struct platform_device *pdev) spi_imx->devtype_data.reset(spi_imx); spi_imx->devtype_data.intctrl(spi_imx, 0); - ret = spi_bitbang_start(&spi_imx->bitbang); if (ret) { dev_err(&pdev->dev, "bitbang start failed with %d\n", ret); goto out_clk_put; } + clk_disable(spi_imx->clk); dev_info(&pdev->dev, "probed\n"); @@ -902,7 +905,7 @@ static int __devexit spi_imx_remove(struct platform_device *pdev) int i; spi_bitbang_stop(&spi_imx->bitbang); - + clk_enable(spi_imx->clk); writel(0, spi_imx->base + MXC_CSPICTRL); clk_disable(spi_imx->clk); clk_put(spi_imx->clk); -- 2.39.5