The Qualcomm SoundWire controller driver ignored the paging fields of
struct sdw_msg, so any register access above the 16-bit address space
(e.g. the SDCA control space used by the WCD9378 codec) silently read
the low 15 bits only. The core already splits the address into
addr_page1/addr_page2 and sets msg->page; write the two SCP_AddrPage
registers through the command FIFO before the transfer, as the vendor
swr-mstr-ctrl driver does.
Verified on Fairphone 6 (SM7635): WCD9378 SDCA registers (0x40000000+)
read back their documented reset defaults; without this every paged
read returned zeros.
Assisted-by: Claude:claude-fable-5
Signed-off-by: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
Jorijn van der Graaf
8ed47c2b0a