[PATCH 1/3] ASoC: rt1320: run the initialisation preset on the first hardware init

[Sergey Lebedev <lsa.uz@pm.me>]

rt1320_io_init() applies the vendor initialisation preset only when the
amplifier's SDCA function status has FUNCTION_NEEDS_INITIALIZATION set:

	if ((amp_func_status & FUNCTION_NEEDS_INITIALIZATION)) {

Its two sibling drivers guard the same write differently, also running
the preset on the first hardware init:

  rt712-sdca.c:  if ((amp_func_status & FUNCTION_NEEDS_INITIALIZATION) ||
                     (!rt712->first_hw_init)) {
  rt722-sdca.c:  if ((amp_func_status & FUNCTION_NEEDS_INITIALIZATION) ||
                     (!rt722->first_hw_init)) {

On the Microsoft Surface Pro 11 (Intel) the RT1320 never sets that bit.
Its function status reads back 0x41 on every boot, cold or warm:

  rt1320-sdca sdw:0:0:025d:1320:01: rt1320_io_init amp func_status=0x41

which is NEWLY_ATTACHED | FUNCTION_HAS_BEEN_RESET: the function reports
that it has been reset and does not consider itself in need of
initialisation. Bit 5 is never set, so the preset never runs,
rt1320_vc_preset() and the MCU patch load are skipped, and the amplifier
is left unprogrammed. rt712 and rt722 would have run it via their
first_hw_init fallback.

Add the same fallback. With it rt1320_vc_preset() executes and the
amplifier reports RT1320_KR0_INT_READY=0x1f where previously it did not.

Signed-off-by: Sergey Lebedev <lsa.uz@pm.me>
---
 sound/soc/codecs/rt1320-sdw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt1320-sdw.c b/sound/soc/codecs/rt1320-sdw.c
index 13493b85f..d1f3b160a 100644
--- a/sound/soc/codecs/rt1320-sdw.c
+++ b/sound/soc/codecs/rt1320-sdw.c
@@ -1900,7 +1900,7 @@ static int rt1320_io_init(struct device *dev, struct sdw_slave *slave)
 	dev_dbg(dev, "%s amp func_status=0x%x\n", __func__, amp_func_status);
 
 	/* initialization write */
-	if ((amp_func_status & FUNCTION_NEEDS_INITIALIZATION)) {
+	if ((amp_func_status & FUNCTION_NEEDS_INITIALIZATION) || !rt1320->first_hw_init) {
 		switch (rt1320->dev_id) {
 		case RT1320_DEV_ID:
 			if (rt1320->version_id < RT1320_VC)
-- 
2.50.1 (Apple Git-155)