[PATCH 1/3] spi: add power control when set_cs_timing
From: Leilk Liu <hidden>
Date: 2021-02-07 03:12:18
Also in:
linux-arm-kernel
Subsystem:
spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
From: "leilk.liu" <redacted> As to set_cs_timing takes effect immediately, power spi is needed when call spi_set_cs_timing. Signed-off-by: leilk.liu <redacted> --- drivers/spi/spi.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a17efa8c3047..21ea3e8a00e2 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c@@ -3460,11 +3460,30 @@ EXPORT_SYMBOL_GPL(spi_setup); int spi_set_cs_timing(struct spi_device *spi, struct spi_delay *setup, struct spi_delay *hold, struct spi_delay *inactive) { + struct device *parent = spi->controller->dev.parent; size_t len; + int status; + + if (spi->controller->set_cs_timing) { + if (spi->controller->auto_runtime_pm) { + status = pm_runtime_get_sync(parent); + if (status < 0) { + pm_runtime_put_noidle(parent); + dev_err(&spi->controller->dev, "Failed to power device: %d\n", + status); + return status; + } - if (spi->controller->set_cs_timing) - return spi->controller->set_cs_timing(spi, setup, hold, - inactive); + status = spi->controller->set_cs_timing(spi, setup, + hold, inactive); + pm_runtime_mark_last_busy(parent); + pm_runtime_put_autosuspend(parent); + return status; + } else { + return spi->controller->set_cs_timing(spi, setup, hold, + inactive); + } + } if ((setup && setup->unit == SPI_DELAY_UNIT_SCK) || (hold && hold->unit == SPI_DELAY_UNIT_SCK) ||
--
2.18.0
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