From: Clemens Ladisch <clemens@ladisch.de>
Date: Wed, 24 Sep 2008 13:25:28 +0000 (+0200)
Subject: ALSA: oxygen: wait for ACK when resetting UART
X-Git-Tag: v2.6.28-rc1~720^2~33
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=cdad5b8db91ac46a8e226306d062fe4c896b2bed;p=linux-2.6-omap-h63xx.git

ALSA: oxygen: wait for ACK when resetting UART

After sending a reset command to the UART, wait some time for the ACK to
be generated (and to be read and dropped by the interrupt handler)
before sending the next command.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
---

diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index deba7389aec..3126c4b403d 100644
--- a/sound/pci/oxygen/oxygen_io.c
+++ b/sound/pci/oxygen/oxygen_io.c
@@ -244,6 +244,7 @@ static void _write_uart(struct oxygen *chip, unsigned int port, u8 data)
 void oxygen_reset_uart(struct oxygen *chip)
 {
 	_write_uart(chip, 1, MPU401_RESET);
+	msleep(1); /* wait for ACK */
 	_write_uart(chip, 1, MPU401_ENTER_UART);
 }
 EXPORT_SYMBOL(oxygen_reset_uart);