| Message ID | 20210608185913.3909878-1-mnhagan88@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | e67f325e9cd67562b761e884680c0fec03a6f404 |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [v3] net: stmmac: explicitly deassert GMAC_AHB_RESET | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | success | Link |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Guessed tree name to be net-next |
| netdev/subject_prefix | warning | Target tree name not specified in the subject |
| netdev/cc_maintainers | success | CCed 17 of 17 maintainers |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 22 this patch: 22 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | warning | CHECK: Lines should not end with a '(' WARNING: ENOTSUPP is not a SUSV4 error code, prefer EOPNOTSUPP |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 22 this patch: 22 |
| netdev/header_inline | success | Link |
Hello: This patch was applied to netdev/net-next.git (refs/heads/master): On Tue, 8 Jun 2021 19:59:06 +0100 you wrote: > 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 > > [...] Here is the summary with links: - [v3] net: stmmac: explicitly deassert GMAC_AHB_RESET https://git.kernel.org/netdev/net-next/c/e67f325e9cd6 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 6d41dd6f9f7a..78dafde70671 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -6840,6 +6840,11 @@ int stmmac_dvr_probe(struct device *device, 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: %pe\n", + ERR_PTR(ret)); + /* Init MAC and get the capabilities */ ret = stmmac_hw_init(priv); if (ret) @@ -7072,6 +7077,7 @@ 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 && diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index 97a1fedcc9ac..d8ae58bdbbe3 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c @@ -600,6 +600,13 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac) goto error_hw_init; } + plat->stmmac_ahb_rst = devm_reset_control_get_optional_shared( + &pdev->dev, "ahb"); + if (IS_ERR(plat->stmmac_ahb_rst)) { + ret = plat->stmmac_ahb_rst; + goto error_hw_init; + } + return plat; error_hw_init: diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h index e55a4807e3ea..9b6a64f3e3dc 100644 --- a/include/linux/stmmac.h +++ b/include/linux/stmmac.h @@ -239,6 +239,7 @@ struct plat_stmmacenet_data { unsigned int mult_fact_100ns; 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;
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> --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++++++ drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 7 +++++++ include/linux/stmmac.h | 1 + 3 files changed, 14 insertions(+)