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AC97 register 0x54 is used by ICH to control GPIOs, which we don't want to access

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@6907 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper
2004-03-05 23:08:28 +00:00
parent 2ba990dd94
commit 1ee25753d7
2 changed files with 6 additions and 5 deletions
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src/add-ons/kernel/drivers/audio/ac97/ich/ac97.c
-5
View File
@@ -586,11 +586,6 @@ ac97_reg_is_valid(ac97_dev *dev, uint8 reg)
return false;
switch (dev->codec_id) {
case CODEC_ID_ALC201A:
if (reg != 0x54) /* reading register 0x54 causes a semaphore timeout on the next register accessed */
return true;
return false;
case CODEC_ID_AK4540:
case CODEC_ID_AK4542:
if (reg < 0x1e || reg == 0x20 || reg == 0x26 || reg > 0x7a)
src/add-ons/kernel/drivers/audio/ac97/ich/io.c
+6
View File
@@ -130,7 +130,10 @@ ich_codec_read(int regno)
{
status_t rv;
ASSERT(regno >= 0);
ASSERT((regno & 1) == 0);
ASSERT(((config->type & TYPE_ICH4) != 0 && regno <= 511) || regno <= 255);
if (regno == 0x54) // intel uses 0x54 for GPIO access, we filter it!
return 0;
rv = ich_codec_wait();
if (rv != B_OK)
PRINT(("semaphore timeout reading register %#x\n",regno));
@@ -145,7 +148,10 @@ ich_codec_write(int regno, uint16 value)
{
status_t rv;
ASSERT(regno >= 0);
ASSERT((regno & 1) == 0);
ASSERT(((config->type & TYPE_ICH4) != 0 && regno <= 511) || regno <= 255);
if (regno == 0x54) // intel uses 0x54 for GPIO access, we filter it!
return;
rv = ich_codec_wait();
if (rv != B_OK)
PRINT(("semaphore timeout writing register %#x\n",regno));