scsi: ufs: core: Fix MCQ MAC configuration

As per JEDEC Standard No. 223E Section 5.9.2, the max # active commands
value programmed by the host sw in MCQConfig.MAC should be one less than
the actual value.

Signed-off-by: Rohit Ner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Peter Wang <[email protected]>
Reviewed-by: Can Guo <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: rohitner-google

drivers/ufs/core/ufs-mcq.c

@@ -94,7 +94,7 @@ void ufshcd_mcq_config_mac(struct ufs_hba *hba, u32 max_active_cmds)
 
 	val = ufshcd_readl(hba, REG_UFS_MCQ_CFG);
 	val &= ~MCQ_CFG_MAC_MASK;
-	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds);
+	val |= FIELD_PREP(MCQ_CFG_MAC_MASK, max_active_cmds - 1);
 	ufshcd_writel(hba, val, REG_UFS_MCQ_CFG);
 }
 EXPORT_SYMBOL_GPL(ufshcd_mcq_config_mac);