[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20230919164535.128125-3-ben.wolsieffer@hefring.com>
Date: Tue, 19 Sep 2023 12:45:35 -0400
From: Ben Wolsieffer <ben.wolsieffer@...ring.com>
To: linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Christophe Roullier <christophe.roullier@...com>,
Ben Wolsieffer <ben.wolsieffer@...ring.com>
Subject: [PATCH 1/2] net: stmmac: dwmac-stm32: fix resume on STM32 MCU
The STM32MP1 keeps clk_rx enabled during suspend, and therefore the
driver does not enable the clock in stm32_dwmac_init() if the device was
suspended. The problem is that this same code runs on STM32 MCUs, which
do disable clk_rx during suspend, causing the clock to never be
re-enabled on resume.
This patch adds a variant flag to indicate that clk_rx remains enabled
during suspend, and uses this to decide whether to enable the clock in
stm32_dwmac_init() if the device was suspended.
Fixes: 6528e02cc9ff ("net: ethernet: stmmac: add adaptation for stm32mp157c.")
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@...ring.com>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 26ea8c687881..a0e276783e65 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -104,6 +104,7 @@ struct stm32_ops {
int (*parse_data)(struct stm32_dwmac *dwmac,
struct device *dev);
u32 syscfg_eth_mask;
+ bool clk_rx_enable_in_suspend;
};
static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat)
@@ -121,7 +122,8 @@ static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat)
if (ret)
return ret;
- if (!dwmac->dev->power.is_suspended) {
+ if (!dwmac->ops->clk_rx_enable_in_suspend ||
+ !dwmac->dev->power.is_suspended) {
ret = clk_prepare_enable(dwmac->clk_rx);
if (ret) {
clk_disable_unprepare(dwmac->clk_tx);
@@ -513,7 +515,8 @@ static struct stm32_ops stm32mp1_dwmac_data = {
.suspend = stm32mp1_suspend,
.resume = stm32mp1_resume,
.parse_data = stm32mp1_parse_data,
- .syscfg_eth_mask = SYSCFG_MP1_ETH_MASK
+ .syscfg_eth_mask = SYSCFG_MP1_ETH_MASK,
+ .clk_rx_enable_in_suspend = true
};
static const struct of_device_id stm32_dwmac_match[] = {
--
2.42.0
Powered by blists - more mailing lists