From: Andrew Lunn <andrew@lunn.ch>
To: "Csókás Bence" <csokas.bence@prolan.hu>
Cc: netdev@vger.kernel.org,
Richard Cochran <richardcochran@gmail.com>,
Fugang Duan <fugang.duan@nxp.com>
Subject: Re: [PATCH] fec: Restart PPS after link state change
Date: Tue, 9 Aug 2022 19:28:21 +0200 [thread overview]
Message-ID: <YvKZNcVfYdLw7bkm@lunn.ch> (raw)
In-Reply-To: <20220809124119.29922-1-csokas.bence@prolan.hu>
On Tue, Aug 09, 2022 at 02:41:19PM +0200, Csókás Bence wrote:
> On link state change, the controller gets reset,
> causing PPS to drop out. So we restart it if needed.
>
> Signed-off-by: Csókás Bence <csokas.bence@prolan.hu>
> ---
> drivers/net/ethernet/freescale/fec_main.c | 27 ++++++++++++++++++++++-
> 1 file changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index ca5d49361fdf..c264b1dd5286 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -954,6 +954,7 @@ fec_restart(struct net_device *ndev)
> u32 temp_mac[2];
> u32 rcntl = OPT_FRAME_SIZE | 0x04;
> u32 ecntl = 0x2; /* ETHEREN */
> + struct ptp_clock_request ptp_rq = { .type = PTP_CLK_REQ_PPS };
Is it safe to hard code this? What if the user configured
PTP_CLK_REQ_EXTTS or PTP_CLK_REQ_PEROUT?
> /* Whack a reset. We should wait for this.
> * For i.MX6SX SOC, enet use AXI bus, we use disable MAC
> @@ -1119,6 +1120,13 @@ fec_restart(struct net_device *ndev)
> if (fep->bufdesc_ex)
> fec_ptp_start_cyclecounter(ndev);
>
> + /* Restart PPS if needed */
> + if (fep->pps_enable) {
> + /* Clear flag so fec_ptp_enable_pps() doesn't return immediately */
> + fep->pps_enable = 0;
If reset causes PPS to stop, maybe it would be better to do this
unconditionally?
fep->pps_enable = 0;
fep->ptp_caps.enable(&fep->ptp_caps, &ptp_rq, 1);
> + if (fep->bufdesc_ex)
> + ecntl |= (1 << 4);
Please replace (1 << 4) with a #define to make it clear what this is doing.
> +
> /* We have to keep ENET enabled to have MII interrupt stay working */
> if (fep->quirks & FEC_QUIRK_ENET_MAC &&
> !(fep->wol_flag & FEC_WOL_FLAG_SLEEP_ON)) {
> - writel(2, fep->hwp + FEC_ECNTRL);
> + ecntl |= 0x2;
> writel(rmii_mode, fep->hwp + FEC_R_CNTRL);
> }
> +
> + writel(ecntl, fep->hwp + FEC_ECNTRL);
> +
> + if (fep->bufdesc_ex)
> + fec_ptp_start_cyclecounter(ndev);
> +
> + /* Restart PPS if needed */
> + if (fep->pps_enable) {
> + /* Clear flag so fec_ptp_enable_pps() doesn't return immediately */
> + fep->pps_enable = 0;
> + fep->ptp_caps.enable(&fep->ptp_caps, &ptp_rq, 1);
> + }
So you re-start PPS in stop()? Should it keep outputting when the
interface is down?
Also, if it is always outputting, don't you need to stop it in
fec_drv_remove(). You probably don't want to still going after the
driver is unloaded.
Andrew
next prev parent reply other threads:[~2022-08-09 17:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-09 12:41 [PATCH] fec: Restart PPS after link state change Csókás Bence
2022-08-09 17:28 ` Andrew Lunn [this message]
2022-08-10 11:36 ` Csókás Bence
2022-08-11 0:05 ` Andrew Lunn
2022-08-11 1:37 ` Richard Cochran
2022-08-11 2:05 ` Andrew Lunn
2022-08-11 8:07 ` Csókás Bence
2022-08-11 16:38 ` Richard Cochran
2022-08-11 9:23 ` Csókás Bence
2022-08-11 13:30 ` Andrew Lunn
2022-08-11 14:45 ` Csókás Bence
-- strict thread matches above, loose matches on Subject: below --
2022-08-10 14:00 Csókás Bence
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