netdev - [PATCH net 1/7] atlantic: Increase delay for fw transactions

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Date:   Mon, 29 Nov 2021 05:28:23 -0800
From:   Sudarsana Reddy Kalluru <skalluru@...vell.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <irusskikh@...vell.com>,
        <dbezrukov@...vell.com>
Subject: [PATCH net 1/7] atlantic: Increase delay for fw transactions

From: Dmitry Bogdanov <dbezrukov@...vell.com>

The max waiting period (of 1 ms) while reading the data from FW shared
buffer is too small for certain types of data (e.g., stats). There's a
chance that FW could be updating buffer at the same time and driver
would be unsuccessful in reading data. Firmware manual recommends to
have 1 sec timeout to fix this issue.

Fixes: 5cfd54d7dc186 ("net: atlantic: minimal A2 fw_ops")
Signed-off-by: Dmitry Bogdanov <dbezrukov@...vell.com>
Signed-off-by: Sudarsana Reddy Kalluru <skalluru@...vell.com>
Signed-off-by: Igor Russkikh <irusskikh@...vell.com>
---
 .../ethernet/aquantia/atlantic/hw_atl2/hw_atl2_utils_fw.c  | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl2/hw_atl2_utils_fw.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl2/hw_atl2_utils_fw.c
index dd259c8f2f4f..b0e4119b9883 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl2/hw_atl2_utils_fw.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl2/hw_atl2_utils_fw.c
@@ -84,7 +84,7 @@ static int hw_atl2_shared_buffer_read_block(struct aq_hw_s *self,
 			if (cnt > AQ_A2_FW_READ_TRY_MAX)
 				return -ETIME;
 			if (tid1.transaction_cnt_a != tid1.transaction_cnt_b)
-				udelay(1);
+				mdelay(1);
 		} while (tid1.transaction_cnt_a != tid1.transaction_cnt_b);
 
 		hw_atl2_mif_shared_buf_read(self, offset, (u32 *)data, dwords);
@@ -339,8 +339,11 @@ static int aq_a2_fw_update_stats(struct aq_hw_s *self)
 {
 	struct hw_atl2_priv *priv = (struct hw_atl2_priv *)self->priv;
 	struct statistics_s stats;
+	int err;
 
-	hw_atl2_shared_buffer_read_safe(self, stats, &stats);
+	err = hw_atl2_shared_buffer_read_safe(self, stats, &stats);
+	if (err)
+		return err;
 
 #define AQ_SDELTA(_N_, _F_) (self->curr_stats._N_ += \
 			stats.msm._F_ - priv->last_stats.msm._F_)
-- 
2.27.0