at91: add kernel support for sama7g5 soc

[openwrt/staging/mkresin.git] / target / linux / at91 / patches-5.10 / 135-net-macb-Correct-usage-of-MACB_CAPS_CLK_HW_CHG-flag.patch

diff --git a/target/linux/at91/patches-5.10/135-net-macb-Correct-usage-of-MACB_CAPS_CLK_HW_CHG-flag.patch b/target/linux/at91/patches-5.10/135-net-macb-Correct-usage-of-MACB_CAPS_CLK_HW_CHG-flag.patch
new file mode 100644 (file)
index 0000000..2ed825d
--- /dev/null
+++ b/target/linux/at91/patches-5.10/135-net-macb-Correct-usage-of-MACB_CAPS_CLK_HW_CHG-flag.patch
@@ -0,0 +1,50 @@
+From 982347f757b85ef526afaf243867ddd515475e1b Mon Sep 17 00:00:00 2001
+From: Charles Keepax <ckeepax@opensource.cirrus.com>
+Date: Mon, 4 Jan 2021 10:38:02 +0000
+Subject: [PATCH 135/247] net: macb: Correct usage of MACB_CAPS_CLK_HW_CHG flag
+
+A new flag MACB_CAPS_CLK_HW_CHG was added and all callers of
+macb_set_tx_clk were gated on the presence of this flag.
+
+-   if (!clk)
++ if (!bp->tx_clk || !(bp->caps & MACB_CAPS_CLK_HW_CHG))
+
+However the flag was not added to anything other than the new
+sama7g5_gem, turning that function call into a no op for all other
+systems. This breaks the networking on Zynq.
+
+The commit message adding this states: a new capability so that
+macb_set_tx_clock() to not be called for IPs having this
+capability
+
+This strongly implies that present of the flag was intended to skip
+the function not absence of the flag. Update the if statement to
+this effect, which repairs the existing users.
+
+Fixes: daafa1d33cc9 ("net: macb: add capability to not set the clock rate")
+Suggested-by: Andrew Lunn <andrew@lunn.ch>
+Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
+Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
+Reviewed-by: Andrew Lunn <andrew@lunn.ch>
+Link: https://lore.kernel.org/r/20210104103802.13091-1-ckeepax@opensource.cirrus.com
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/ethernet/cadence/macb_main.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
+index 4ce302e03735..d5bd640d3fa4 100644
+--- a/drivers/net/ethernet/cadence/macb_main.c
++++ b/drivers/net/ethernet/cadence/macb_main.c
+@@ -464,7 +464,7 @@ static void macb_set_tx_clk(struct macb *bp, int speed)
+ {
+       long ferr, rate, rate_rounded;
+ 
+-      if (!bp->tx_clk || !(bp->caps & MACB_CAPS_CLK_HW_CHG))
++      if (!bp->tx_clk || (bp->caps & MACB_CAPS_CLK_HW_CHG))
+               return;
+ 
+       switch (speed) {
+-- 
+2.32.0
+