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openwrt/target/linux/stm32/patches-6.6/002-net-stmmac-dwmac-stm32-refactor-clock-config.patch

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stm32: add new stm32 target New stm32 target introduces support for stm32mp1 based devices. For now it includes an initial support of the STM32MP135F-DK device. The specifications bellow only list supported features. Specifications -------------- SOC: STM32MP135FAF7 RAM: 512 MiB Storage: SD Card Ethernet: 2x 100 Mbps Wireless: 2.4GHz Cypress CYW43455 (802.11b/g/n) LEDs: Heartbeat (Blue) Buttons: 1x Reset, 1x User (USER2) USB: 4x 2.0 Type-A Signed-off-by: Thomas Richard <thomas.richard@bootlin.com> Link: https://github.com/openwrt/openwrt/pull/16716 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2024-09-26 14:55:22 +00:00
From 73c350e3fb32e9598b66f61081c7e06a7fba49f8 Mon Sep 17 00:00:00 2001
From: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Date: Mon, 9 Oct 2023 10:59:04 -0400
Subject: [PATCH 2/8] net: stmmac: dwmac-stm32: refactor clock config
Currently, clock configuration is spread throughout the driver and
partially duplicated for the STM32MP1 and STM32 MCU variants. This makes
it difficult to keep track of which clocks need to be enabled or disabled
in various scenarios.
This patch adds symmetric stm32_dwmac_clk_enable/disable() functions
that handle all clock configuration, including quirks required while
suspending or resuming. syscfg_clk and clk_eth_ck are not present on
STM32 MCUs, but it is fine to try to configure them anyway since NULL
clocks are ignored.
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
.../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 113 +++++++-----------
1 file changed, 45 insertions(+), 68 deletions(-)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -98,7 +98,6 @@ struct stm32_dwmac {
struct stm32_ops {
int (*set_mode)(struct plat_stmmacenet_data *plat_dat);
- int (*clk_prepare)(struct stm32_dwmac *dwmac, bool prepare);
int (*suspend)(struct stm32_dwmac *dwmac);
void (*resume)(struct stm32_dwmac *dwmac);
int (*parse_data)(struct stm32_dwmac *dwmac,
@@ -107,62 +106,55 @@ struct stm32_ops {
bool clk_rx_enable_in_suspend;
};
-static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat)
+static int stm32_dwmac_clk_enable(struct stm32_dwmac *dwmac, bool resume)
{
- struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
int ret;
- if (dwmac->ops->set_mode) {
- ret = dwmac->ops->set_mode(plat_dat);
- if (ret)
- return ret;
- }
-
ret = clk_prepare_enable(dwmac->clk_tx);
if (ret)
- return ret;
+ goto err_clk_tx;
- if (!dwmac->ops->clk_rx_enable_in_suspend ||
- !dwmac->dev->power.is_suspended) {
+ if (!dwmac->ops->clk_rx_enable_in_suspend || !resume) {
ret = clk_prepare_enable(dwmac->clk_rx);
- if (ret) {
- clk_disable_unprepare(dwmac->clk_tx);
- return ret;
- }
+ if (ret)
+ goto err_clk_rx;
}
- if (dwmac->ops->clk_prepare) {
- ret = dwmac->ops->clk_prepare(dwmac, true);
- if (ret) {
- clk_disable_unprepare(dwmac->clk_rx);
- clk_disable_unprepare(dwmac->clk_tx);
- }
+ ret = clk_prepare_enable(dwmac->syscfg_clk);
+ if (ret)
+ goto err_syscfg_clk;
+
+ if (dwmac->enable_eth_ck) {
+ ret = clk_prepare_enable(dwmac->clk_eth_ck);
+ if (ret)
+ goto err_clk_eth_ck;
}
return ret;
+
+err_clk_eth_ck:
+ clk_disable_unprepare(dwmac->syscfg_clk);
+err_syscfg_clk:
+ if (!dwmac->ops->clk_rx_enable_in_suspend || !resume)
+ clk_disable_unprepare(dwmac->clk_rx);
+err_clk_rx:
+ clk_disable_unprepare(dwmac->clk_tx);
+err_clk_tx:
+ return ret;
}
-static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare)
+static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat, bool resume)
{
- int ret = 0;
+ struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
+ int ret;
- if (prepare) {
- ret = clk_prepare_enable(dwmac->syscfg_clk);
+ if (dwmac->ops->set_mode) {
+ ret = dwmac->ops->set_mode(plat_dat);
if (ret)
return ret;
- if (dwmac->enable_eth_ck) {
- ret = clk_prepare_enable(dwmac->clk_eth_ck);
- if (ret) {
- clk_disable_unprepare(dwmac->syscfg_clk);
- return ret;
- }
- }
- } else {
- clk_disable_unprepare(dwmac->syscfg_clk);
- if (dwmac->enable_eth_ck)
- clk_disable_unprepare(dwmac->clk_eth_ck);
}
- return ret;
+
+ return stm32_dwmac_clk_enable(dwmac, resume);
}
static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
@@ -252,13 +244,15 @@ static int stm32mcu_set_mode(struct plat
dwmac->ops->syscfg_eth_mask, val << 23);
}
-static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac)
+static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac, bool suspend)
{
clk_disable_unprepare(dwmac->clk_tx);
- clk_disable_unprepare(dwmac->clk_rx);
+ if (!dwmac->ops->clk_rx_enable_in_suspend || !suspend)
+ clk_disable_unprepare(dwmac->clk_rx);
- if (dwmac->ops->clk_prepare)
- dwmac->ops->clk_prepare(dwmac, false);
+ clk_disable_unprepare(dwmac->syscfg_clk);
+ if (dwmac->enable_eth_ck)
+ clk_disable_unprepare(dwmac->clk_eth_ck);
}
static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
@@ -397,7 +391,7 @@ static int stm32_dwmac_probe(struct plat
plat_dat->bsp_priv = dwmac;
- ret = stm32_dwmac_init(plat_dat);
+ ret = stm32_dwmac_init(plat_dat, false);
if (ret)
return ret;
@@ -408,7 +402,7 @@ static int stm32_dwmac_probe(struct plat
return 0;
err_clk_disable:
- stm32_dwmac_clk_disable(dwmac);
+ stm32_dwmac_clk_disable(dwmac, false);
return ret;
}
@@ -421,7 +415,7 @@ static void stm32_dwmac_remove(struct pl
stmmac_dvr_remove(&pdev->dev);
- stm32_dwmac_clk_disable(priv->plat->bsp_priv);
+ stm32_dwmac_clk_disable(dwmac, false);
if (dwmac->irq_pwr_wakeup >= 0) {
dev_pm_clear_wake_irq(&pdev->dev);
@@ -431,18 +425,7 @@ static void stm32_dwmac_remove(struct pl
static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
{
- int ret = 0;
-
- ret = clk_prepare_enable(dwmac->clk_ethstp);
- if (ret)
- return ret;
-
- clk_disable_unprepare(dwmac->clk_tx);
- clk_disable_unprepare(dwmac->syscfg_clk);
- if (dwmac->enable_eth_ck)
- clk_disable_unprepare(dwmac->clk_eth_ck);
-
- return ret;
+ return clk_prepare_enable(dwmac->clk_ethstp);
}
static void stm32mp1_resume(struct stm32_dwmac *dwmac)
@@ -450,14 +433,6 @@ static void stm32mp1_resume(struct stm32
clk_disable_unprepare(dwmac->clk_ethstp);
}
-static int stm32mcu_suspend(struct stm32_dwmac *dwmac)
-{
- clk_disable_unprepare(dwmac->clk_tx);
- clk_disable_unprepare(dwmac->clk_rx);
-
- return 0;
-}
-
#ifdef CONFIG_PM_SLEEP
static int stm32_dwmac_suspend(struct device *dev)
{
@@ -468,6 +443,10 @@ static int stm32_dwmac_suspend(struct de
int ret;
ret = stmmac_suspend(dev);
+ if (ret)
+ return ret;
+
+ stm32_dwmac_clk_disable(dwmac, true);
if (dwmac->ops->suspend)
ret = dwmac->ops->suspend(dwmac);
@@ -485,7 +464,7 @@ static int stm32_dwmac_resume(struct dev
if (dwmac->ops->resume)
dwmac->ops->resume(dwmac);
- ret = stm32_dwmac_init(priv->plat);
+ ret = stm32_dwmac_init(priv->plat, true);
if (ret)
return ret;
@@ -500,13 +479,11 @@ static SIMPLE_DEV_PM_OPS(stm32_dwmac_pm_
static struct stm32_ops stm32mcu_dwmac_data = {
.set_mode = stm32mcu_set_mode,
- .suspend = stm32mcu_suspend,
.syscfg_eth_mask = SYSCFG_MCU_ETH_MASK
};
static struct stm32_ops stm32mp1_dwmac_data = {
.set_mode = stm32mp1_set_mode,
- .clk_prepare = stm32mp1_clk_prepare,
.suspend = stm32mp1_suspend,
.resume = stm32mp1_resume,
.parse_data = stm32mp1_parse_data,
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