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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues_text/target_missing/host_missing/accel_missing/1618
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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+intel-hda:  SD_STS different behavior for byte write vs. word write
+Description of problem:
+The Intel HDA SD_STS register is accessible two different ways in QEMU:  either it's the top 8 bits of a 32-bit access
+or it's directly accessible as a byte.
+On reads, the register behavior for SD_STS is identical whether accessed as a 32-bit read or an 8-bit read.
+On writes, the behavior is different; when written to as an 8-bit write, the BCIS, FIFOE, and DESE bits implement the documented HDA behavior of RW1C (writing a 1 to a bit clears it).  When written to as the top 8 bits of a 32-bit write, writing a 1 to a bit sets the bit -- so an attempt to clear a status bit instead unconditionally sets the status bit.
+Steps to reproduce:
+1.  Write 32 bits at SD_CTL address with bit 27 set (FIFOE).  This should clear FIFOE, but does not.
+2.  Read back SD_STS (SD_CTL address + 3) as a byte.  The FIFOE bit will be set.
+3.  Write 8 bits at SD_STS address with bit 3 set (FIFOE).  This should clear FIFOE, and it does.
+4.  Read back SD_STS as a byte.  The FIFOE bit will be cleared.
+Additional information:
+