ANDROID: scsi: ufs: add UFSHCD_ANDROID_QUIRK_NO_IS_READ_ON_H8

Add UFSHCD_ANDROID_QUIRK_NO_IS_READ_ON_H8 for host controllers which
break when the Interrupt Status register is re-read after entering
hibern8. In such cases after hibern8 entry is reported, no further
register access will occur in the interrupt handler.

Bug: 350576949
Change-Id: I8e810c96203a97f030216aae39253a2e102c7ebf
Signed-off-by: VAMSHI GAJJELA <vamshigajjela@google.com>

drivers/ufs/core/ufshcd.c

@@ -7186,6 +7186,11 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba)
 		if (enabled_intr_status)
 			retval |= ufshcd_sl_intr(hba, enabled_intr_status);
 
+		if (hba->android_quirks &
+			    UFSHCD_ANDROID_QUIRK_NO_IS_READ_ON_H8 &&
+		    intr_status & UIC_HIBERNATE_ENTER)
+			break;
+
 		intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
 	}
 

include/ufs/ufshcd.h

@@ -706,6 +706,9 @@ enum ufshcd_quirks {
 enum ufshcd_android_quirks {
 	/* Set IID to one. */
 	UFSHCD_ANDROID_QUIRK_SET_IID_TO_ONE		= 1 << 0,
+
+	/* Do not read IS after H8 enter */
+	UFSHCD_ANDROID_QUIRK_NO_IS_READ_ON_H8		= 1 << 1,
 };
 
 enum ufshcd_caps {