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spi: sifive: add PM callbacks to support suspend/resume
The patch has been tested on Unmatched using pm_test. The Unmatched board uses SD over SPI and it was tested by initiating S2RAM cycles for all devices while reading/writing files at the same time. We found no dropped connection to the card or corrupted filesystem during test cycles. Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Greentime Hu <greentime.hu@sifive.com> Link: https://lore.kernel.org/r/20220610074459.3261383-2-andy.chiu@sifive.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -427,6 +427,44 @@ static int sifive_spi_remove(struct platform_device *pdev)
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return 0;
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}
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static int sifive_spi_suspend(struct device *dev)
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{
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struct spi_master *master = dev_get_drvdata(dev);
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struct sifive_spi *spi = spi_master_get_devdata(master);
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int ret;
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ret = spi_master_suspend(master);
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if (ret)
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return ret;
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/* Disable all the interrupts just in case */
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sifive_spi_write(spi, SIFIVE_SPI_REG_IE, 0);
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clk_disable_unprepare(spi->clk);
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return ret;
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}
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static int sifive_spi_resume(struct device *dev)
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{
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struct spi_master *master = dev_get_drvdata(dev);
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struct sifive_spi *spi = spi_master_get_devdata(master);
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int ret;
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ret = clk_prepare_enable(spi->clk);
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if (ret)
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return ret;
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ret = spi_master_resume(master);
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if (ret)
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clk_disable_unprepare(spi->clk);
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return ret;
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(sifive_spi_pm_ops,
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sifive_spi_suspend, sifive_spi_resume);
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static const struct of_device_id sifive_spi_of_match[] = {
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{ .compatible = "sifive,spi0", },
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{}
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@ -438,6 +476,7 @@ static struct platform_driver sifive_spi_driver = {
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.remove = sifive_spi_remove,
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.driver = {
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.name = SIFIVE_SPI_DRIVER_NAME,
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.pm = &sifive_spi_pm_ops,
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.of_match_table = sifive_spi_of_match,
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},
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};
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