Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7e86c0...
Commit: 7e86c0e6850504ec9516b953f316a47277825e33
Parent: 37a76bd4f1b716949fc38a6842e89f0ccb8384d0
Author: Clemens Ladisch <clemens@ladisch.de>
AuthorDate: Thu Jan 15 10:21:23 2009 +0100
Committer: Takashi Iwai <tiwai@suse.de>
CommitDate: Thu Jan 15 10:30:20 2009 +0100
sound: virtuoso: do not overwrite EEPROM on Xonar D2/D2X
On the Asus Xonar D2 and D2X models, the SPI chip select signal for the
fourth DAC shares its pin with the serial clock for the EEPROM that
contains the PCI subdevice ID values. It appears that when DAC
registers are written and some other unknown conditions occur (probably
noise on the EEPROM's chip select line), the EEPROM gets overwritten
with garbage, which makes it impossible to properly detect the card
later.
Therefore, we better avoid DAC register writes and make sure that the
driver works with the DAC's registers' default values. Consequently,
the sample format is now I2S instead of left-justified (no user-visible
change), and the DAC's volume/mute registers cannot be used anymore
(volume changes are now done by the software volume plugin).
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/pci/oxygen/virtuoso.c | 17 +++++++++++++----
1 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/sound/pci/oxygen/virtuoso.c b/sound/pci/oxygen/virtuoso.c
index 98c6a8c..e9e829e 100644
--- a/sound/pci/oxygen/virtuoso.c
+++ b/sound/pci/oxygen/virtuoso.c
@@ -26,7 +26,7 @@
* SPI 0 -> 1st PCM1796 (front)
* SPI 1 -> 2nd PCM1796 (surround)
* SPI 2 -> 3rd PCM1796 (center/LFE)
- * SPI 4 -> 4th PCM1796 (back)
+ * SPI 4 -> 4th PCM1796 (back) and EEPROM self-destruct (do not use!)
*
* GPIO 2 -> M0 of CS5381
* GPIO 3 -> M1 of CS5381
@@ -207,6 +207,12 @@ static void xonar_gpio_changed(struct oxygen *chip);
static inline void pcm1796_write_spi(struct oxygen *chip, unsigned int codec,
u8 reg, u8 value)
{
+ /*
+ * We don't want to do writes on SPI 4 because the EEPROM, which shares
+ * the same pin, might get confused and broken. We'd better take care
+ * that the driver works with the default register values ...
+ */
+#if 0
/* maps ALSA channel pair number to SPI output */
static const u8 codec_map[4] = {
0, 1, 2, 4
@@ -217,6 +223,7 @@ static inline void pcm1796_write_spi(struct oxygen *chip, unsigned int codec,
(codec_map[codec] << OXYGEN_SPI_CODEC_SHIFT) |
OXYGEN_SPI_CEN_LATCH_CLOCK_HI,
(reg << 8) | value);
+#endif
}
static inline void pcm1796_write_i2c(struct oxygen *chip, unsigned int codec,
@@ -750,6 +757,9 @@ static const DECLARE_TLV_DB_SCALE(cs4362a_db_scale, -12700, 100, 0);
static int xonar_d2_control_filter(struct snd_kcontrol_new *template)
{
+ if (!strncmp(template->name, "Master Playback ", 16))
+ /* disable volume/mute because they would require SPI writes */
+ return 1;
if (!strncmp(template->name, "CD Capture ", 11))
/* CD in is actually connected to the video in pin */
template->private_value ^= AC97_CD ^ AC97_VIDEO;
@@ -840,9 +850,8 @@ static const struct oxygen_model model_xonar_d2 = {
.dac_volume_min = 0x0f,
.dac_volume_max = 0xff,
.misc_flags = OXYGEN_MISC_MIDI,
- .function_flags = OXYGEN_FUNCTION_SPI |
- OXYGEN_FUNCTION_ENABLE_SPI_4_5,
- .dac_i2s_format = OXYGEN_I2S_FORMAT_LJUST,
+ .function_flags = OXYGEN_FUNCTION_SPI,
+ .dac_i2s_format = OXYGEN_I2S_FORMAT_I2S,
.adc_i2s_format = OXYGEN_I2S_FORMAT_LJUST,
};
--
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
