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    Subject[PATCH 1/1] spi: mediatek: add power control when set_cs
    Date
    From: "luhua.xu" <luhua.xu@mediatek.com>

    Use runtime PM to power spi when set_cs
    As set_cs may be called from interrupt context,
    set runtime PM IRQ safe for spi.

    Signed-off-by: luhua.xu <luhua.xu@mediatek.com>
    ---
    drivers/spi/spi-mt65xx.c | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
    index 6888a4d..039b67d 100644
    --- a/drivers/spi/spi-mt65xx.c
    +++ b/drivers/spi/spi-mt65xx.c
    @@ -262,8 +262,16 @@ static int mtk_spi_prepare_message(struct spi_master *master,
    static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
    {
    u32 reg_val;
    + int ret;
    struct mtk_spi *mdata = spi_master_get_devdata(spi->master);

    + ret = pm_runtime_get_sync(spi->master->dev.parent);
    + if (ret < 0) {
    + pm_runtime_put_noidle(spi->master->dev.parent);
    + dev_err(&spi->dev, "failed to power device(%d)\n", ret);
    + return;
    + }
    +
    reg_val = readl(mdata->base + SPI_CMD_REG);
    if (!enable) {
    reg_val |= SPI_CMD_PAUSE_EN;
    @@ -274,6 +282,9 @@ static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
    mdata->state = MTK_SPI_IDLE;
    mtk_spi_reset(mdata);
    }
    +
    + pm_runtime_mark_last_busy(spi->master->dev.parent);
    + pm_runtime_put_autosuspend(spi->master->dev.parent);
    }

    static void mtk_spi_prepare_transfer(struct spi_master *master,
    @@ -749,6 +760,7 @@ static int mtk_spi_probe(struct platform_device *pdev)
    clk_disable_unprepare(mdata->spi_clk);

    pm_runtime_enable(&pdev->dev);
    + pm_runtime_irq_safe(&pdev->dev);

    ret = devm_spi_register_master(&pdev->dev, master);
    if (ret) {
    --
    2.6.4
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