[ALSA] oxygen: reduce SPI clock frequency for AK4396/WM8785

According to the datasheets, the SPI clock cycle must be at least 200 ns
for the AK4396 and the WM8785, so we cannot use the default 160 ns.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/oxygen/oxygen.c

@@ -166,7 +166,7 @@ static void ak4396_write(struct oxygen *chip, unsigned int codec,
 	};
 	oxygen_write_spi(chip, OXYGEN_SPI_TRIGGER |
 			 OXYGEN_SPI_DATA_LENGTH_2 |
-			 OXYGEN_SPI_CLOCK_160 |
+			 OXYGEN_SPI_CLOCK_320 |
 			 (codec_spi_map[codec] << OXYGEN_SPI_CODEC_SHIFT) |
 			 OXYGEN_SPI_CEN_LATCH_CLOCK_HI,
 			 AK4396_WRITE | (reg << 8) | value);
@@ -176,7 +176,7 @@ static void wm8785_write(struct oxygen *chip, u8 reg, unsigned int value)
 {
 	oxygen_write_spi(chip, OXYGEN_SPI_TRIGGER |
 			 OXYGEN_SPI_DATA_LENGTH_2 |
-			 OXYGEN_SPI_CLOCK_160 |
+			 OXYGEN_SPI_CLOCK_320 |
 			 (3 << OXYGEN_SPI_CODEC_SHIFT) |
 			 OXYGEN_SPI_CEN_LATCH_CLOCK_LO,
 			 (reg << 9) | value);

sound/pci/oxygen/oxygen_io.c

@@ -174,7 +174,7 @@ void oxygen_write_spi(struct oxygen *chip, u8 control, unsigned int data)
 {
 	unsigned int count;
 
-	/* should not need more than 3.84 us (24 * 160 ns) */
+	/* should not need more than 7.68 us (24 * 320 ns) */
 	count = 10;
 	while ((oxygen_read8(chip, OXYGEN_SPI_CONTROL) & OXYGEN_SPI_BUSY)
 	       && count > 0) {