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From e67f325e9cd67562b761e884680c0fec03a6f404 Mon Sep 17 00:00:00 2001
From: Matthew Hagan <mnhagan88@gmail.com>
Date: Tue, 8 Jun 2021 19:59:06 +0100
Subject: net: stmmac: explicitly deassert GMAC_AHB_RESET
We are currently assuming that GMAC_AHB_RESET will already be deasserted
by the bootloader. However if this has not been done, probing of the GMAC
will fail. To remedy this we must ensure GMAC_AHB_RESET has been deasserted
prior to probing.
v2 changes:
- remove NULL condition check for stmmac_ahb_rst in stmmac_main.c
- unwrap dev_err() message in stmmac_main.c
- add PTR_ERR() around plat->stmmac_ahb_rst in stmmac_platform.c
v3 changes:
- add error pointer to dev_err() output
- add reset_control_assert(stmmac_ahb_rst) in stmmac_dvr_remove
- revert PTR_ERR() around plat->stmmac_ahb_rst since this is performed
on the returned value of ret by the calling function
Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +++++
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 6 ++++++
include/linux/stmmac.h | 1 +
3 files changed, 12 insertions(+)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5020,6 +5020,10 @@ int stmmac_dvr_probe(struct device *devi
reset_control_reset(priv->plat->stmmac_rst);
}
+ ret = reset_control_deassert(priv->plat->stmmac_ahb_rst);
+ if (ret == -ENOTSUPP)
+ dev_err(priv->device, "unable to bring out of ahb reset\n");
+
/* Init MAC and get the capabilities */
ret = stmmac_hw_init(priv);
if (ret)
@@ -5244,6 +5248,7 @@ int stmmac_dvr_remove(struct device *dev
phylink_destroy(priv->phylink);
if (priv->plat->stmmac_rst)
reset_control_assert(priv->plat->stmmac_rst);
+ reset_control_assert(priv->plat->stmmac_ahb_rst);
pm_runtime_put(dev);
pm_runtime_disable(dev);
if (priv->hw->pcs != STMMAC_PCS_TBI &&
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -616,6 +616,12 @@ stmmac_probe_config_dt(struct platform_d
plat->stmmac_rst = NULL;
}
+ plat->stmmac_ahb_rst = devm_reset_control_get_optional_shared(
+ &pdev->dev, "ahb");
+ if (IS_ERR(plat->stmmac_ahb_rst))
+ if (PTR_ERR(plat->stmmac_ahb_rst) == -EPROBE_DEFER)
+ goto error_hw_init;
+
return plat;
error_hw_init:
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -192,6 +192,7 @@ struct plat_stmmacenet_data {
unsigned int clk_ref_rate;
s32 ptp_max_adj;
struct reset_control *stmmac_rst;
+ struct reset_control *stmmac_ahb_rst;
struct stmmac_axi *axi;
int has_gmac4;
bool has_sun8i;
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