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Commit 10dd44dc authored by Roman Volkov's avatar Roman Volkov Committed by Clemens Ladisch
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ALSA: oxygen: add the separate SPI waiting function 



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: default avatarRoman Volkov <v1ron@mail.ru>
Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
parent d8ec26d7

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;