[PATCH] usb: mtu3: flush cache for next GPD

[Chunfeng Yun]

When flush cache of the current GPD and resume QMU, the controller
will try to access the next GPD after processing the current one,
if not flush the next GPD, the controller may get wrong GPD status.

Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>
---
 drivers/usb/mtu3/mtu3_qmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/mtu3/mtu3_qmu.c b/drivers/usb/mtu3/mtu3_qmu.c
index 801c2bc416..95eaf6d236 100644
--- a/drivers/usb/mtu3/mtu3_qmu.c
+++ b/drivers/usb/mtu3/mtu3_qmu.c
@@ -198,6 +198,7 @@ static int mtu3_prepare_tx_gpd(struct mtu3_ep *mep, struct mtu3_request *mreq)
 
 	enq->flag &= ~GPD_FLAGS_HWO;
 	gpd->next_gpd = cpu_to_le32((u32)gpd_virt_to_dma(ring, enq));
+	mtu3_flush_cache((uintptr_t)enq, sizeof(*gpd));
 
 	if (req->zero)
 		gpd->ext_flag |= GPD_EXT_FLAG_ZLP;
@@ -234,6 +235,8 @@ static int mtu3_prepare_rx_gpd(struct mtu3_ep *mep, struct mtu3_request *mreq)
 
 	enq->flag &= ~GPD_FLAGS_HWO;
 	gpd->next_gpd = cpu_to_le32((u32)gpd_virt_to_dma(ring, enq));
+	mtu3_flush_cache((uintptr_t)enq, sizeof(*gpd));
+
 	gpd->flag |= GPD_FLAGS_IOC | GPD_FLAGS_HWO;
 
 	mreq->gpd = gpd;
-- 
2.18.0