linux-kernel - [PATCH] net: macb: Set MDIO clock divisor for pclk higher than 160MHz

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Message-Id: <20230316100339.1302212-1-bwawrzyn@cisco.com>
Date:   Thu, 16 Mar 2023 10:03:39 +0000
From:   Bartosz Wawrzyniak <bwawrzyn@...co.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, nicolas.ferre@...rochip.com,
        claudiu.beznea@...rochip.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        xe-linux-external@...co.com, danielwa@...co.com, olicht@...co.com,
        mawierzb@...co.com, Bartosz Wawrzyniak <bwawrzyn@...co.com>
Subject: [PATCH] net: macb: Set MDIO clock divisor for pclk higher than 160MHz

Currently macb sets clock divisor for pclk up to 160 MHz.
Function gem_mdc_clk_div was updated to enable divisor
for higher values of pclk.

Signed-off-by: Bartosz Wawrzyniak <bwawrzyn@...co.com>
---
 drivers/net/ethernet/cadence/macb.h      | 2 ++
 drivers/net/ethernet/cadence/macb_main.c | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 14dfec4db8f9..c1fc91c97cee 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -692,6 +692,8 @@
 #define GEM_CLK_DIV48				3
 #define GEM_CLK_DIV64				4
 #define GEM_CLK_DIV96				5
+#define GEM_CLK_DIV128				6
+#define GEM_CLK_DIV224				7
 
 /* Constants for MAN register */
 #define MACB_MAN_C22_SOF			1
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 6e141a8bbf43..8708af6d25ed 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -2641,8 +2641,12 @@ static u32 gem_mdc_clk_div(struct macb *bp)
 		config = GEM_BF(CLK, GEM_CLK_DIV48);
 	else if (pclk_hz <= 160000000)
 		config = GEM_BF(CLK, GEM_CLK_DIV64);
-	else
+	else if (pclk_hz <= 240000000)
 		config = GEM_BF(CLK, GEM_CLK_DIV96);
+	else if (pclk_hz <= 320000000)
+		config = GEM_BF(CLK, GEM_CLK_DIV128);
+	else
+		config = GEM_BF(CLK, GEM_CLK_DIV224);
 
 	return config;
 }
-- 
2.33.0