Re: [PATCH net v2] stmmac: dwmac-mediatek: fix clock issue

From: Matthias Brugger
Date: Fri Jul 08 2022 - 04:18:09 EST




On 08/07/2022 09:56, Biao Huang wrote:
Since clocks are handled in mediatek_dwmac_clks_config(),
remove the clocks configuration in init()/exit(), and
invoke mediatek_dwmac_clks_config instead.

This issue is found in suspend/resume test.

Fixes: 3186bdad97d5 ("stmmac: dwmac-mediatek: add platform level clocks management")
Signed-off-by: Biao Huang <biao.huang@xxxxxxxxxxxx>
---
.../ethernet/stmicro/stmmac/dwmac-mediatek.c | 32 ++++++-------------
1 file changed, 10 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
index 6ff88df58767..6d82cf2658e0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -576,32 +576,12 @@ static int mediatek_dwmac_init(struct platform_device *pdev, void *priv)
}
}
- ret = clk_bulk_prepare_enable(variant->num_clks, plat->clks);
- if (ret) {
- dev_err(plat->dev, "failed to enable clks, err = %d\n", ret);
- return ret;
- }
-
- ret = clk_prepare_enable(plat->rmii_internal_clk);
- if (ret) {
- dev_err(plat->dev, "failed to enable rmii internal clk, err = %d\n", ret);
- goto err_clk;
- }
-
return 0;
-
-err_clk:
- clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
- return ret;
}
static void mediatek_dwmac_exit(struct platform_device *pdev, void *priv)
{
- struct mediatek_dwmac_plat_data *plat = priv;
- const struct mediatek_dwmac_variant *variant = plat->variant;
-
- clk_disable_unprepare(plat->rmii_internal_clk);
- clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
+ /* nothing to do now */

We can just leave the function pointer point to NULL, that get checked before calling exit.

Regards,
Matthias

}
static int mediatek_dwmac_clks_config(void *priv, bool enabled)
@@ -712,13 +692,21 @@ static int mediatek_dwmac_probe(struct platform_device *pdev)
mediatek_dwmac_common_data(pdev, plat_dat, priv_plat);
mediatek_dwmac_init(pdev, priv_plat);
+ ret = mediatek_dwmac_clks_config(priv_plat, true);
+ if (ret)
+ return ret;
+
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret) {
stmmac_remove_config_dt(pdev, plat_dat);
- return ret;
+ goto err_drv_probe;
}
return 0;
+
+err_drv_probe:
+ mediatek_dwmac_clks_config(priv_plat, false);
+ return ret;
}
static const struct of_device_id mediatek_dwmac_match[] = {