tg3: Set card 57765 card reader MRRS to 1024B

This patch sets the Maximum Read Request Size for the card reader
function to 1024 bytes to prevent an SD controller lockup.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 4ae01b3799f4..a0ab89eb8bcc 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -7704,6 +7704,8 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy)
             GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57765) {
                 val = tr32(TG3PCI_DMA_RW_CTRL) &
                       ~DMA_RWCTRL_DIS_CACHE_ALIGNMENT;
+                if (tp->pci_chip_rev_id == CHIPREV_ID_57765_A0)
+                        val &= ~DMA_RWCTRL_CRDRDR_RDMA_MRRS_MSK;
                 tw32(TG3PCI_DMA_RW_CTRL, val | tp->dma_rwctrl);
         } else if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5784 &&
                    GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5761) {
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 8a6012ab23ff..9e7fe0e7cdb8 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -183,6 +183,7 @@
 #define   METAL_REV_B2                   0x02
 #define TG3PCI_DMA_RW_CTRL              0x0000006c
 #define  DMA_RWCTRL_DIS_CACHE_ALIGNMENT  0x00000001
+#define  DMA_RWCTRL_CRDRDR_RDMA_MRRS_MSK 0x00000380
 #define  DMA_RWCTRL_READ_BNDRY_MASK      0x00000700
 #define  DMA_RWCTRL_READ_BNDRY_DISAB     0x00000000
 #define  DMA_RWCTRL_READ_BNDRY_16        0x00000100