From: Clemens Ladisch <clemens@ladisch.de>
Date: Mon, 3 Sep 2007 07:56:23 +0000 (+0200)
Subject: [ALSA] cmipci: check that the legacy MIDI port works
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=88039815d8868fb507eb69448f5a3a65c90b0bf2;p=linux-beck.git

[ALSA] cmipci: check that the legacy MIDI port works

Check that the UART_EN bit actually enabled the MPU-401 port.
Apparently, C-Media thinks that it is a good idea to be paranoid here.

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

diff --git a/sound/pci/cmipci.c b/sound/pci/cmipci.c
index fdc4615ea0e7..9149d00d1ad5 100644
--- a/sound/pci/cmipci.c
+++ b/sound/pci/cmipci.c
@@ -3012,6 +3012,13 @@ static int __devinit snd_cmipci_create(struct snd_card *card, struct pci_dev *pc
 			snd_cmipci_write(cm, CM_REG_LEGACY_CTRL, val);
 			/* enable UART */
 			snd_cmipci_set_bit(cm, CM_REG_FUNCTRL1, CM_UART_EN);
+			if (inb(iomidi + 1) == 0xff) {
+				snd_printk(KERN_ERR "cannot enable MPU-401 port"
+					   " at %#lx\n", iomidi);
+				snd_cmipci_clear_bit(cm, CM_REG_FUNCTRL1,
+						     CM_UART_EN);
+				iomidi = 0;
+			}
 		}
 	}