From: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Date: Fri, 6 Nov 2009 12:48:33 +0000 (+0900)
Subject: i2c-designware: Enable RX_FULL interrupt
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=21a89d4101ce338c2872401c82b66a7c155e24ab;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

i2c-designware: Enable RX_FULL interrupt

Enable RX_FULL interrupt mask by default, and hook it in the interrupt
handler.  If requested amount of rx data (defined by IC_RX_TL) is not
available, we don't have to process i2c_dw_read().

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---

diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index 0eea0dd3589..940bbf31bc8 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -342,7 +342,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
 	u32 addr = msgs[dev->msg_write_idx].addr;
 	u32 buf_len = dev->tx_buf_len;
 
-	intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT;
+	intr_mask = DW_IC_INTR_STOP_DET | DW_IC_INTR_TX_ABRT | DW_IC_INTR_RX_FULL;
 
 	if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) {
 		/* Disable the adapter */
@@ -593,10 +593,11 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 		dev->status = STATUS_IDLE;
 	}
 
-	if (stat & DW_IC_INTR_TX_EMPTY) {
+	if (stat & DW_IC_INTR_RX_FULL)
 		i2c_dw_read(dev);
+
+	if (stat & DW_IC_INTR_TX_EMPTY)
 		i2c_dw_xfer_msg(dev);
-	}
 
 	/*
 	 * No need to modify or disable the interrupt mask here.