ALSA: hdac: clear link output stream mapping

Fix potential DMA hang upon starting playback on devices in HDA mode
on Intel platforms (Gemini Lake/Whiskey Lake/Comet Lake/Ice Lake). It
doesn't affect platforms before Gemini Lake or any Intel device in
non-HDA mode.

The reset value for the LOSDIV register is all output streams valid.
Clear this register to invalidate non-existent streams when the bus
is powered up.

Signed-off-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190930142945.7805-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h
index 0fd3929..057d2a2 100644 (file)
--- a/include/sound/hda_register.h
+++ b/include/sound/hda_register.h
@@ -264,6 +264,9 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 #define AZX_REG_ML_LOUTPAY             0x20
 #define AZX_REG_ML_LINPAY              0x30
 
+/* bit0 is reserved, with BIT(1) mapping to stream1 */
+#define ML_LOSIDV_STREAM_MASK          0xFFFE
+
 #define ML_LCTL_SCF_MASK                       0xF
 #define AZX_MLCTL_SPA                          (0x1 << 16)
 #define AZX_MLCTL_CPA                          (0x1 << 23)

diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c
index 211ca85..cfab60d 100644 (file)
--- a/sound/hda/ext/hdac_ext_controller.c
+++ b/sound/hda/ext/hdac_ext_controller.c
@@ -271,6 +271,11 @@ int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
                ret = snd_hdac_ext_bus_link_power_up(link);
 
                /*
+                * clear the register to invalidate all the output streams
+                */
+               snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV,
+                                ML_LOSIDV_STREAM_MASK, 0);
+               /*
                 *  wait for 521usec for codec to report status
                 *  HDA spec section 4.3 - Codec Discovery
                 */