From 61b8013a114cb041db2c56f747953cac69637f26 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Date: Sun, 17 Jul 2011 20:54:09 +0000
Subject: [PATCH] stmmac: Allow SOCs to use Store forward mode eventhough
tx_coe is 0. (V2)
This patch adds new field 'force_sf_dma_mode' to plat_stmmacenet_data
struct to allow users to specify if they want to use force store forward
eventhough tx_coe is not available in hw.
without this flag stmmac driver will use cut-thru mode not use
store-forward mode.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/stmmac/stmmac_main.c | 8 +++++---
include/linux/stmmac.h | 1 +
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/net/stmmac/stmmac_main.c b/drivers/net/stmmac/stmmac_main.c
index c8c9e5bc6608..d37ebc80623a 100644
--- a/drivers/net/stmmac/stmmac_main.c
+++ b/drivers/net/stmmac/stmmac_main.c
@@ -557,9 +557,11 @@ static void free_dma_desc_resources(struct stmmac_priv *priv)
*/
static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
{
- if (likely((priv->plat->tx_coe) && (!priv->no_csum_insertion))) {
- /* In case of GMAC, SF mode has to be enabled
- * to perform the TX COE. This depends on:
+ if (likely(priv->plat->force_sf_dma_mode ||
+ ((priv->plat->tx_coe) && (!priv->no_csum_insertion)))) {
+ /*
+ * In case of GMAC, SF mode can be enabled
+ * to perform the TX COE in HW. This depends on:
* 1) TX COE if actually supported
* 2) There is no bugged Jumbo frame support
* that needs to not insert csum in the TDES.
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 9529e49b0385..05d775690b72 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -40,6 +40,7 @@ struct plat_stmmacenet_data {
int tx_coe;
int bugged_jumbo;
int pmt;
+ int force_sf_dma_mode;
void (*fix_mac_speed)(void *priv, unsigned int speed);
void (*bus_setup)(void __iomem *ioaddr);
int (*init)(struct platform_device *pdev);
--
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