linux-kernel - Re: [PATCH v8 7/7] net: phy: qt2025: Wait until PHY becomes ready

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Message-ID: <20250122183755.753fbee9.gary@garyguo.net>
Date: Wed, 22 Jan 2025 18:37:55 +0000
From: Gary Guo <gary@...yguo.net>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
 rust-for-linux@...r.kernel.org, netdev@...r.kernel.org,
 hkallweit1@...il.com, tmgross@...ch.edu, ojeda@...nel.org,
 alex.gaynor@...il.com, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
 a.hindborg@...sung.com, aliceryhl@...gle.com, anna-maria@...utronix.de,
 frederic@...nel.org, tglx@...utronix.de, arnd@...db.de, jstultz@...gle.com,
 sboyd@...nel.org, mingo@...hat.com, peterz@...radead.org,
 juri.lelli@...hat.com, vincent.guittot@...aro.org,
 dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
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Subject: Re: [PATCH v8 7/7] net: phy: qt2025: Wait until PHY becomes ready

On Thu, 16 Jan 2025 13:40:59 +0900
FUJITA Tomonori <fujita.tomonori@...il.com> wrote:

> Wait until a PHY becomes ready in the probe callback by
> using read_poll_timeout function.
> 
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>

Reviewed-by: Gary Guo <gary@...yguo.net>

> ---
>  drivers/net/phy/qt2025.rs | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/qt2025.rs b/drivers/net/phy/qt2025.rs
> index 1ab065798175..f642831519ca 100644
> --- a/drivers/net/phy/qt2025.rs
> +++ b/drivers/net/phy/qt2025.rs
> @@ -12,6 +12,7 @@
>  use kernel::c_str;
>  use kernel::error::code;
>  use kernel::firmware::Firmware;
> +use kernel::io::poll::read_poll_timeout;
>  use kernel::net::phy::{
>      self,
>      reg::{Mmd, C45},
> @@ -19,6 +20,7 @@
>  };
>  use kernel::prelude::*;
>  use kernel::sizes::{SZ_16K, SZ_8K};
> +use kernel::time::Delta;
>  
>  kernel::module_phy_driver! {
>      drivers: [PhyQT2025],
> @@ -93,7 +95,13 @@ fn probe(dev: &mut phy::Device) -> Result<()> {
>          // The micro-controller will start running from SRAM.
>          dev.write(C45::new(Mmd::PCS, 0xe854), 0x0040)?;
>  
> -        // TODO: sleep here until the hw becomes ready.
> +        read_poll_timeout(
> +            || dev.read(C45::new(Mmd::PCS, 0xd7fd)),
> +            |val| val != 0x00 && val != 0x10,
> +            Delta::from_millis(50),
> +            Delta::from_secs(3),
> +        )?;
> +
>          Ok(())
>      }
>