linux-kernel - RE: [PATCH v2 net-next 2/2] net: macb: Add zynqmp SGMII dynamic configuration support

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Date:   Mon, 1 Aug 2022 13:02:31 +0000
From:   "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
To:     "Claudiu.Beznea@...rochip.com" <Claudiu.Beznea@...rochip.com>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "Nicolas.Ferre@...rochip.com" <Nicolas.Ferre@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "git (AMD-Xilinx)" <git@....com>, "git@...inx.com" <git@...inx.com>
Subject: RE: [PATCH v2 net-next 2/2] net: macb: Add zynqmp SGMII dynamic
 configuration support

> -----Original Message-----
> From: Claudiu.Beznea@...rochip.com <Claudiu.Beznea@...rochip.com>
> Sent: Monday, August 1, 2022 5:06 PM
> To: Pandey, Radhey Shyam <radhey.shyam.pandey@....com>;
> michal.simek@...inx.com; Nicolas.Ferre@...rochip.com;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; gregkh@...uxfoundation.org
> Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> netdev@...r.kernel.org; git (AMD-Xilinx) <git@....com>; git@...inx.com
> Subject: Re: [PATCH v2 net-next 2/2] net: macb: Add zynqmp SGMII dynamic
> configuration support
> 
> On 29.07.2022 22:35, Radhey Shyam Pandey wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know
> > the content is safe
> >
> > Add support for the dynamic configuration which takes care of
> > configuring the GEM secure space configuration registers using EEMI
> > APIs. High level sequence is to:
> > - Check for the PM dynamic configuration support, if no error proceed with
> >   GEM dynamic configurations(next steps) otherwise skip the dynamic
> >   configuration.
> > - Configure GEM Fixed configurations.
> > - Configure GEM_CLK_CTRL (gemX_sgmii_mode).
> > - Trigger GEM reset.
> >
> > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > Reviewed-by: Andrew Lunn <andrew@...n.ch>
> > Tested-by: Conor Dooley <conor.dooley@...rochip.com> (for MPFS)
> > ---
> > Changes for v2:
> > - Add phy_exit() in error return paths.
> > ---
> >  drivers/net/ethernet/cadence/macb_main.c | 25
> > +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/cadence/macb_main.c
> > b/drivers/net/ethernet/cadence/macb_main.c
> > index 4cd4f57ca2aa..517b40ff098b 100644
> > --- a/drivers/net/ethernet/cadence/macb_main.c
> > +++ b/drivers/net/ethernet/cadence/macb_main.c
> > @@ -38,6 +38,7 @@
> >  #include <linux/pm_runtime.h>
> >  #include <linux/ptp_classify.h>
> >  #include <linux/reset.h>
> > +#include <linux/firmware/xlnx-zynqmp.h>
> >  #include "macb.h"
> >
> >  /* This structure is only used for MACB on SiFive FU540 devices */ @@
> > -4621,6 +4622,30 @@ static int init_reset_optional(struct platform_device
> *pdev)
> >                                              "failed to init SGMII PHY\n");
> >         }
> >
> > +       ret = zynqmp_pm_is_function_supported(PM_IOCTL,
> IOCTL_SET_GEM_CONFIG);
> > +       if (!ret) {
> > +               u32 pm_info[2];
> > +
> > +               ret = of_property_read_u32_array(pdev->dev.of_node, "power-
> domains",
> > +                                                pm_info, ARRAY_SIZE(pm_info));
> > +               if (ret < 0) {
> > +                       phy_exit(bp->sgmii_phy);
> 
> Could you move this to a single exit point and jump in there with goto?
> Same for the rest of occurencies.

Ok, will make to use of common exit path and send out a new version.

> 
> Also, I notice just now that phy_init() is done only if bp->phy_interface ==
> PHY_INTERFACE_MODE_SGMII, phy_exit() should be handled only if this is
> true, too.

If phy interface is not SGMII bp->sgmii_phy would be NULL and calling 
phy_exit should still be fine as these phy APIs has already a NULL check.

> 
> > +                       dev_err(&pdev->dev, "Failed to read power management
> information\n");
> > +                       return ret;
> > +               }
> > +               ret = zynqmp_pm_set_gem_config(pm_info[1],
> GEM_CONFIG_FIXED, 0);
> > +               if (ret < 0) {
> > +                       phy_exit(bp->sgmii_phy);
> > +                       return ret;
> > +               }
> > +
> > +               ret = zynqmp_pm_set_gem_config(pm_info[1],
> GEM_CONFIG_SGMII_MODE, 1);
> > +               if (ret < 0) {
> > +                       phy_exit(bp->sgmii_phy);
> > +                       return ret;
> > +               }
> > +       }
> > +
> >         /* Fully reset controller at hardware level if mapped in device tree */
> >         ret = device_reset_optional(&pdev->dev);
> >         if (ret) {
> > --
> > 2.1.1
> >