This is a note to let you know that I've just added the patch titled net: ethernet: ti: cpsw: fix cpts irq after suspend to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-ethernet-ti-cpsw-fix-cpts-irq-after-suspend.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sun Nov 22 10:24:40 AM CET 2020 From: Grygorii Strashko <grygorii.strashko@xxxxxx> Date: Thu, 12 Nov 2020 13:15:46 +0200 Subject: net: ethernet: ti: cpsw: fix cpts irq after suspend From: Grygorii Strashko <grygorii.strashko@xxxxxx> [ Upstream commit 2b5668733050fca85f0ab458c5b91732f9496a38 ] Depending on the SoC/platform the CPSW can completely lose context after a suspend/resume cycle, including CPSW wrapper (WR) which will cause reset of WR_C0_MISC_EN register, so CPTS IRQ will became disabled. Fix it by moving CPTS IRQ enabling in cpsw_ndo_open() where CPTS is actually started. Fixes: 84ea9c0a95d7 ("net: ethernet: ti: cpsw: enable cpts irq") Reported-by: Tony Lindgren <tony@xxxxxxxxxxx> Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx> Tested-by: Tony Lindgren <tony@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20201112111546.20343-1-grygorii.strashko@xxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/ti/cpsw.c | 10 ++++++---- drivers/net/ethernet/ti/cpsw_new.c | 9 ++++++--- 2 files changed, 12 insertions(+), 7 deletions(-) --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -838,9 +838,12 @@ static int cpsw_ndo_open(struct net_devi if (ret < 0) goto err_cleanup; - if (cpts_register(cpsw->cpts)) - dev_err(priv->dev, "error registering cpts device\n"); - + if (cpsw->cpts) { + if (cpts_register(cpsw->cpts)) + dev_err(priv->dev, "error registering cpts device\n"); + else + writel(0x10, &cpsw->wr_regs->misc_en); + } } cpsw_restore(priv); @@ -1722,7 +1725,6 @@ static int cpsw_probe(struct platform_de /* Enable misc CPTS evnt_pend IRQ */ cpts_set_irqpoll(cpsw->cpts, false); - writel(0x10, &cpsw->wr_regs->misc_en); skip_cpts: cpsw_notice(priv, probe, --- a/drivers/net/ethernet/ti/cpsw_new.c +++ b/drivers/net/ethernet/ti/cpsw_new.c @@ -873,8 +873,12 @@ static int cpsw_ndo_open(struct net_devi if (ret < 0) goto err_cleanup; - if (cpts_register(cpsw->cpts)) - dev_err(priv->dev, "error registering cpts device\n"); + if (cpsw->cpts) { + if (cpts_register(cpsw->cpts)) + dev_err(priv->dev, "error registering cpts device\n"); + else + writel(0x10, &cpsw->wr_regs->misc_en); + } napi_enable(&cpsw->napi_rx); napi_enable(&cpsw->napi_tx); @@ -2009,7 +2013,6 @@ static int cpsw_probe(struct platform_de /* Enable misc CPTS evnt_pend IRQ */ cpts_set_irqpoll(cpsw->cpts, false); - writel(0x10, &cpsw->wr_regs->misc_en); skip_cpts: ret = cpsw_register_notifiers(cpsw); Patches currently in stable-queue which might be from grygorii.strashko@xxxxxx are queue-5.9/net-ethernet-ti-am65-cpts-update-ret-when-ptp_clock-is-error.patch queue-5.9/net-ethernet-ti-cpsw-fix-cpts-irq-after-suspend.patch