i2c: pasemi: Log bus reset causes

This ensures we get all information we need to debug issues when users
forward us their logs.

Signed-off-by: Hector Martin <[e-mail]>
Reviewed-by: Neal Gompa <[e-mail]>
Reviewed-by: Alyssa Rosenzweig <[e-mail]>
Signed-off-by: Sven Peter <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Andi Shyti <[e-mail]>

drivers/i2c/busses/i2c-pasemi-core.c

···
 /* Register offsets */
 #define REG_MTXFIFO	0x00
 #define REG_MRXFIFO	0x04
+#define REG_XFSTA	0x0c
 #define REG_SMSTA	0x14
 #define REG_IMASK	0x18
 #define REG_CTL		0x1c
···
 				 USEC_PER_MSEC * PASEMI_TRANSFER_TIMEOUT_MS);
 
 	if (ret < 0) {
-		dev_err(smbus->dev, "Bus is still stuck (status 0x%08x)\n", status);
+		dev_err(smbus->dev, "Bus is still stuck (status 0x%08x xfstatus 0x%08x)\n",
+			 status, reg_read(smbus, REG_XFSTA));
 		return -EIO;
 	}
 
 	/* If any badness happened or there is data in the FIFOs, reset the FIFOs */
 	if ((status & (SMSTA_MRNE | SMSTA_JMD | SMSTA_MTO | SMSTA_TOM | SMSTA_MTN | SMSTA_MTA)) ||
-	    !(status & SMSTA_MTE))
+	    !(status & SMSTA_MTE)) {
+		dev_warn(smbus->dev, "Issuing reset due to status 0x%08x (xfstatus 0x%08x)\n",
+			 status, reg_read(smbus, REG_XFSTA));
 		pasemi_reset(smbus);
+	}
 
 	/* Clear the flags */
 	reg_write(smbus, REG_SMSTA, status);