ALSA: oxygen: add the separate SPI waiting function (10dd44dc) · Commits · 戴 / test

The oxygen_wait_spi() function now performs waiting when the SPI bus completes a transaction. Introduce the timeout error checking and increase timeout to 200 from 40. Signed-off-by:

Roman Volkov <v1ron@mail.ru> Signed-off-by:

Clemens Ladisch <clemens@ladisch.de>

sound/pci/oxygen/oxygen_io.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -194,6 +194,24 @@ void oxygen_write_ac97_masked(struct oxygen *chip, unsigned int codec,
		}
		EXPORT_SYMBOL(oxygen_write_ac97_masked);

		static int oxygen_wait_spi(struct oxygen *chip)
		{
		unsigned int count;

		/*
		* Higher timeout to be sure: 200 us;
		* actual transaction should not need more than 40 us.
		*/
		for (count = 50; count > 0; count--) {
		udelay(4);
		if ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) &
		OXYGEN_SPI_BUSY) == 0)
		return 0;
		}
		snd_printk(KERN_ERR "oxygen: SPI wait timeout\n");
		return -EIO;
		}

		void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
		{
		unsigned int count;

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