From 9d6002926cb2d495fdb9097d29da23b63b031f83 Mon Sep 17 00:00:00 2001
From: RichardG867 <richardg867@gmail.com>
Date: Mon, 22 Nov 2021 17:04:14 -0300
Subject: [PATCH] Fix a register bit mask on ES1371

---
 src/sound/snd_audiopci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sound/snd_audiopci.c b/src/sound/snd_audiopci.c
index 22f8751a5..876cd227d 100644
--- a/src/sound/snd_audiopci.c
+++ b/src/sound/snd_audiopci.c
@@ -965,7 +965,7 @@ es1371_outl(uint16_t port, uint32_t val, void *p)
 	/* Sample Rate Converter Interface Register, Address 10H
 	   Addressable as longword only */
 	case 0x10:
-		dev->sr_cir = val & 0xfff8ffff; /*Bits 16 to 18 are undefined*/
+		dev->sr_cir = val & 0xff7fffff; /* Bits 16 to 18 are undefined but read-write. */
 		if (dev->sr_cir & SRC_RAM_WE) {
 			dev->sr_ram[dev->sr_cir >> 25] = val & 0xffff;
 			switch (dev->sr_cir >> 25) {