1 files changed, 20 insertions, 3 deletions

diff --git a/drivers/hid/intel-ish-hid/ishtp/client.c b/drivers/hid/intel-ish-hid/ishtp/client.c
index 1cc157126fce..405e0d5212cc 100644
--- a/drivers/hid/intel-ish-hid/ishtp/client.c
+++ b/drivers/hid/intel-ish-hid/ishtp/client.c
@@ -10,6 +10,7 @@
 #include <linux/wait.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
+#include <asm/cacheflush.h>
 #include "hbm.h"
 #include "client.h"
 
@@ -111,7 +112,7 @@ static void ishtp_cl_init(struct ishtp_cl *cl, struct ishtp_device *dev)
 
 /**
  * ishtp_cl_allocate() - allocates client structure and sets it up.
- * @dev: ishtp device
+ * @cl_device: ishtp client device
  *
  * Allocate memory for new client device and call to initialize each field.
  *
@@ -263,7 +264,6 @@ EXPORT_SYMBOL(ishtp_cl_unlink);
 int ishtp_cl_disconnect(struct ishtp_cl *cl)
 {
 	struct ishtp_device *dev;
-	int err;
 
 	if (WARN_ON(!cl || !cl->dev))
 		return -ENODEV;
@@ -283,7 +283,7 @@ int ishtp_cl_disconnect(struct ishtp_cl *cl)
 		return -ENODEV;
 	}
 
-	err = wait_event_interruptible_timeout(cl->wait_ctrl_res,
+	wait_event_interruptible_timeout(cl->wait_ctrl_res,
 			(dev->dev_state != ISHTP_DEV_ENABLED ||
 			cl->state == ISHTP_CL_DISCONNECTED),
 			ishtp_secs_to_jiffies(ISHTP_CL_CONNECT_TIMEOUT));
@@ -773,6 +773,14 @@ static void ishtp_cl_send_msg_dma(struct ishtp_device *dev,
 	/* write msg to dma buf */
 	memcpy(msg_addr, cl_msg->send_buf.data, cl_msg->send_buf.size);
 
+	/*
+	 * if current fw don't support cache snooping, driver have to
+	 * flush the cache manually.
+	 */
+	if (dev->ops->dma_no_cache_snooping &&
+		dev->ops->dma_no_cache_snooping(dev))
+		clflush_cache_range(msg_addr, cl_msg->send_buf.size);
+
 	/* send dma_xfer hbm msg */
 	off = msg_addr - (unsigned char *)dev->ishtp_host_dma_tx_buf;
 	ishtp_hbm_hdr(&hdr, sizeof(struct dma_xfer_hbm));
@@ -997,6 +1005,15 @@ void recv_ishtp_cl_msg_dma(struct ishtp_device *dev, void *msg,
 		}
 
 		buffer = rb->buffer.data;
+
+		/*
+		 * if current fw don't support cache snooping, driver have to
+		 * flush the cache manually.
+		 */
+		if (dev->ops->dma_no_cache_snooping &&
+			dev->ops->dma_no_cache_snooping(dev))
+			clflush_cache_range(msg, hbm->msg_length);
+
 		memcpy(buffer, msg, hbm->msg_length);
 		rb->buf_idx = hbm->msg_length;