V4L/DVB (10434): cx18: Smarter verification of CX18_AUDIO_ENABLE register writes

The CX18_AUDIO_ENABLE register usually never reads back what was just written
under normal circumstances.  Perform better checking that a write went to the
register as expected with a specification of what bits to verify.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-audio.c

@@ -64,8 +64,7 @@ int cx18_audio_set_io(struct cx18 *cx)
 	val = cx18_read_reg(cx, CX18_AUDIO_ENABLE) & ~0x30;
 	val |= (audio_input > CX18_AV_AUDIO_SERIAL2) ? 0x20 :
 					(audio_input << 4);
-	cx18_write_reg(cx, val | 0xb00, CX18_AUDIO_ENABLE);
-	cx18_vapi(cx, CX18_APU_RESETAI, 1, 0);
+	cx18_write_reg_expect(cx, val | 0xb00, CX18_AUDIO_ENABLE, val, 0x30);
 	return 0;
 }
 

drivers/media/video/cx18/cx18-av-firmware.c

@@ -131,7 +131,8 @@ int cx18_av_loadfw(struct cx18 *cx)
 	v = cx18_read_reg(cx, CX18_AUDIO_ENABLE);
 	/* If bit 11 is 1, clear bit 10 */
 	if (v & 0x800)
-		cx18_write_reg(cx, v & 0xFFFFFBFF, CX18_AUDIO_ENABLE);
+		cx18_write_reg_expect(cx, v & 0xFFFFFBFF, CX18_AUDIO_ENABLE,
+				      0, 0x400);
 
 	/* Enable WW auto audio standard detection */
 	v = cx18_av_read4(cx, CXADEC_STD_DET_CTL);