diff options
| author | Grygorii Strashko <grygorii.strashko@ti.com> | 2017-05-08 14:21:21 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-13 19:50:02 +0200 |
| commit | 246db5901f4a7f0823a37ff0aa4237813bf44e81 (patch) | |
| tree | de2eb224cda2d222b5077ed468450dc097008284 /drivers/net | |
| parent | c81deea4de1c24a8613ce1ee25aaee5f99098fdf (diff) | |
net: ethernet: ti: cpsw: adjust cpsw fifos depth for fullduplex flow control
[ Upstream commit 48f5bccc60675f8426a6159935e8636a1fd89f56 ]
When users set flow control using ethtool the bits are set properly in the
CPGMAC_SL MACCONTROL register, but the FIFO depth in the respective Port n
Maximum FIFO Blocks (Pn_MAX_BLKS) registers remains set to the minimum size
reset value. When receive flow control is enabled on a port, the port's
associated FIFO block allocation must be adjusted. The port RX allocation
must increase to accommodate the flow control runout. The TRM recommends
numbers of 5 or 6.
Hence, apply required Port FIFO configuration to
Pn_MAX_BLKS.Pn_TX_MAX_BLKS=0xF and Pn_MAX_BLKS.Pn_RX_MAX_BLKS=0x5 during
interface initialization.
Cc: Schuyler Patton <spatton@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/ti/cpsw.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 435466c17852..c69b0bdd891d 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -280,6 +280,10 @@ struct cpsw_ss_regs { /* Bit definitions for the CPSW1_TS_SEQ_LTYPE register */ #define CPSW_V1_SEQ_ID_OFS_SHIFT 16 +#define CPSW_MAX_BLKS_TX 15 +#define CPSW_MAX_BLKS_TX_SHIFT 4 +#define CPSW_MAX_BLKS_RX 5 + struct cpsw_host_regs { u32 max_blks; u32 blk_cnt; @@ -1127,11 +1131,23 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv) switch (priv->version) { case CPSW_VERSION_1: slave_write(slave, TX_PRIORITY_MAPPING, CPSW1_TX_PRI_MAP); + /* Increase RX FIFO size to 5 for supporting fullduplex + * flow control mode + */ + slave_write(slave, + (CPSW_MAX_BLKS_TX << CPSW_MAX_BLKS_TX_SHIFT) | + CPSW_MAX_BLKS_RX, CPSW1_MAX_BLKS); break; case CPSW_VERSION_2: case CPSW_VERSION_3: case CPSW_VERSION_4: slave_write(slave, TX_PRIORITY_MAPPING, CPSW2_TX_PRI_MAP); + /* Increase RX FIFO size to 5 for supporting fullduplex + * flow control mode + */ + slave_write(slave, + (CPSW_MAX_BLKS_TX << CPSW_MAX_BLKS_TX_SHIFT) | + CPSW_MAX_BLKS_RX, CPSW2_MAX_BLKS); break; } |