linux-kernel - [PATCH (net.git) 1/3] stmmac: fix TX normal DESC

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Message-ID: <1459494436-27386-2-git-send-email-peppe.cavallaro@st.com>
Date:	Fri, 1 Apr 2016 09:07:14 +0200
From:	Giuseppe Cavallaro <peppe.cavallaro@...com>
To:	<netdev@...r.kernel.org>
CC:	<gabriel.fernandez@...aro.org>, <afaerber@...e.de>,
	<fschaefer.oss@...glemail.com>, <dinh.linux@...il.com>,
	<davem@...emloft.net>, <preid@...ctromag.com.au>,
	<rhgadsdon@...il.com>, <linux-kernel@...r.kernel.org>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Fabrice Gasnier <fabrice.gasnier@...com>
Subject: [PATCH (net.git) 1/3] stmmac: fix TX normal DESC

This patch fixs a regression raised when test on chips that use
the normal descriptor layout. In fact, no len bits were set for
the TDES1 and no OWN bit inside the TDES0.

Signed-off-by: Giuseppe CAVALLARO <peppe.cavallaro@...com>
Tested-by: Andreas Färber <afaerber@...e.de>
Cc: Fabrice Gasnier <fabrice.gasnier@...com>
---
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index e13228f..011386f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -199,11 +199,6 @@ static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 {
 	unsigned int tdes1 = p->des1;
 
-	if (mode == STMMAC_CHAIN_MODE)
-		norm_set_tx_desc_len_on_chain(p, len);
-	else
-		norm_set_tx_desc_len_on_ring(p, len);
-
 	if (is_fs)
 		tdes1 |= TDES1_FIRST_SEGMENT;
 	else
@@ -217,10 +212,15 @@ static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 	if (ls)
 		tdes1 |= TDES1_LAST_SEGMENT;
 
-	if (tx_own)
-		tdes1 |= TDES0_OWN;
-
 	p->des1 = tdes1;
+
+	if (mode == STMMAC_CHAIN_MODE)
+		norm_set_tx_desc_len_on_chain(p, len);
+	else
+		norm_set_tx_desc_len_on_ring(p, len);
+
+	if (tx_own)
+		p->des0 |= TDES0_OWN;
 }
 
 static void ndesc_set_tx_ic(struct dma_desc *p)
-- 
1.7.4.4