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From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: "Pali Rohár" <pali@kernel.org>
Cc: "Andrew Lunn" <andrew@lunn.ch>,
	"Heiner Kallweit" <hkallweit1@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"Marek Behún" <kabel@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips
Date: Wed, 30 Dec 2020 16:10:37 +0000	[thread overview]
Message-ID: <20201230161036.GR1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <20201230154755.14746-2-pali@kernel.org>

On Wed, Dec 30, 2020 at 04:47:52PM +0100, Pali Rohár wrote:
> Workaround for GPON SFP modules based on VSOL V2801F brand was added in
> commit 0d035bed2a4a ("net: sfp: VSOL V2801F / CarlitoxxPro CPGOS03-0490
> v2.0 workaround"). But it works only for ids explicitly added to the list.
> As there are more rebraded VSOL V2801F modules and OEM vendors are putting
> into vendor name random strings we cannot build workaround based on ids.
> 
> Moreover issue which that commit tried to workaround is generic not only to
> VSOL based modules, but rather to all GPON modules based on Realtek RTL8672
> and RTL9601C chips.
> 
> They can be found for example in following GPON modules:
> * V-SOL V2801F
> * C-Data FD511GX-RM0
> * OPTON GP801R
> * BAUDCOM BD-1234-SFM
> * CPGOS03-0490 v2.0
> * Ubiquiti U-Fiber Instant
> * EXOT EGS1
> 
> Those Realtek chips have broken EEPROM emulator which for N-byte read
> operation returns just one byte of EEPROM data followed by N-1 zeros.
> 
> So introduce a new function sfp_id_needs_byte_io() which detects SFP
> modules with these Realtek chips which have broken EEPROM emulator based on
> N-1 zeros and switch to 1 byte EEPROM reading operation which workaround
> this issue.
> 
> This patch fixes reading EEPROM content from SFP modules based on Realtek
> RTL8672 and RTL9601C chips.
> 
> Fixes: 0d035bed2a4a ("net: sfp: VSOL V2801F / CarlitoxxPro CPGOS03-0490 v2.0 workaround")
> Co-developed-by: Russell King <rmk+kernel@armlinux.org.uk>
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
> Signed-off-by: Pali Rohár <pali@kernel.org>
> ---
>  drivers/net/phy/sfp.c | 78 ++++++++++++++++++++++++-------------------
>  1 file changed, 44 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index 91d74c1a920a..490e78a72dd6 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -336,19 +336,11 @@ static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
>  			size_t len)
>  {
>  	struct i2c_msg msgs[2];
> -	size_t block_size;
> +	u8 bus_addr = a2 ? 0x51 : 0x50;
> +	size_t block_size = sfp->i2c_block_size;
>  	size_t this_len;
> -	u8 bus_addr;
>  	int ret;
>  
> -	if (a2) {
> -		block_size = 16;
> -		bus_addr = 0x51;
> -	} else {
> -		block_size = sfp->i2c_block_size;
> -		bus_addr = 0x50;
> -	}
> -

NAK. You are undoing something that is definitely needed. The
diagnostics must be read with sequential reads to be able to properly
read the 16-bit values.

The rest of the patch is fine; it's a shame the entire thing has
been spoilt by this extra addition that was not in the patch we had
been discussing off-list.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

  reply	other threads:[~2020-12-30 16:11 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-30 15:47 [PATCH 0/4] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2020-12-30 15:47 ` [PATCH 1/4] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2020-12-30 16:10   ` Russell King - ARM Linux admin [this message]
2020-12-30 16:56     ` Pali Rohár
2020-12-30 17:05       ` Russell King - ARM Linux admin
2020-12-30 17:13         ` Andrew Lunn
2020-12-30 17:43           ` Pali Rohár
2020-12-30 19:09             ` Russell King - ARM Linux admin
2020-12-30 19:49               ` Andrew Lunn
2020-12-31 12:14               ` Pali Rohár
2020-12-31 15:09                 ` Andrew Lunn
2020-12-31 15:40                   ` Pali Rohár
2020-12-31 15:30                 ` Andrew Lunn
2020-12-31 17:00                   ` Pali Rohár
2020-12-31 17:13                     ` Andrew Lunn
2021-01-02  1:49                       ` Pali Rohár
2021-01-03  2:25                         ` Thomas Schreiber
2021-01-03  2:41                           ` Pali Rohár
2021-01-06 14:55                             ` Pali Rohár
2021-01-06 15:21                               ` Russell King - ARM Linux admin
2021-01-06 15:23                                 ` Russell King - ARM Linux admin
2021-01-06 15:27                                   ` Russell King - ARM Linux admin
2021-01-06 15:35                                     ` Pali Rohár
2020-12-30 19:30             ` Andrew Lunn
2020-12-30 19:39               ` Russell King - ARM Linux admin
2020-12-30 17:31         ` Pali Rohár
2020-12-30 19:18           ` Russell King - ARM Linux admin
2020-12-30 15:47 ` [PATCH 2/4] net: sfp: allow to use also SFP modules which are detected as SFF Pali Rohár
2020-12-30 16:11   ` Russell King - ARM Linux admin
2020-12-30 17:06     ` Pali Rohár
2020-12-30 17:27       ` Marek Behún
2020-12-30 19:12         ` Russell King - ARM Linux admin
2020-12-31 13:52           ` Pali Rohár
2020-12-30 15:47 ` [PATCH 3/4] net: sfp: assume that LOS is not implemented if both LOS normal and inverted is set Pali Rohár
2020-12-30 16:13   ` Russell King - ARM Linux admin
2020-12-30 16:57     ` Pali Rohár
2020-12-30 17:06       ` Russell King - ARM Linux admin
2020-12-30 17:17         ` Andrew Lunn
2020-12-30 17:32           ` Pali Rohár
2020-12-30 15:47 ` [PATCH 4/4] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-06 15:37 ` [PATCH v2 0/3] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2021-01-06 15:37   ` [PATCH v2 1/3] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2021-01-07  2:02     ` Andrew Lunn
2021-01-07  9:08       ` Pali Rohár
2021-01-07 17:19     ` Andrew Lunn
2021-01-07 17:40       ` Russell King - ARM Linux admin
2021-01-07 19:18         ` Pali Rohár
2021-01-07 19:17       ` Pali Rohár
2021-01-07 19:45       ` Russell King - ARM Linux admin
2021-01-07 20:21         ` Marek Behún
2021-01-08  0:49           ` Pali Rohár
2021-01-06 15:37   ` [PATCH v2 2/3] net: sfp: assume that LOS is not implemented if both LOS normal and inverted is set Pali Rohár
2021-01-07 16:54     ` Andrew Lunn
2021-01-09 15:46       ` Russell King - ARM Linux admin
2021-01-09 15:54         ` Andrew Lunn
2021-01-09 16:27           ` Russell King - ARM Linux admin
2021-01-09 19:14         ` Pali Rohár
2021-01-09 23:19           ` Russell King - ARM Linux admin
2021-01-09 23:50             ` Pali Rohár
2021-01-06 15:37   ` [PATCH v2 3/3] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-07 16:51     ` Andrew Lunn
2021-01-11 11:39 ` [PATCH v3 0/2] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2021-01-11 11:39   ` [PATCH v3 1/2] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2021-01-11 15:28     ` Marek Behún
2021-01-11 11:39   ` [PATCH v3 2/2] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-11 15:32     ` Marek Behún
2021-01-12 13:33   ` [PATCH v3 0/2] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber Pali Rohár
2021-01-18  9:34   ` Pali Rohár
2021-01-25 14:09     ` Pali Rohár
2021-01-25 14:16       ` Russell King - ARM Linux admin
2021-01-25 14:23         ` Pali Rohár
2021-01-25 14:42           ` Russell King - ARM Linux admin
2021-01-25 14:47             ` Pali Rohár
2021-01-25 15:41               ` Andrew Lunn
2021-01-25 15:02 ` [PATCH v4 " Pali Rohár
2021-01-25 15:02   ` [PATCH v4 1/2] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips Pali Rohár
2021-01-25 15:02   ` [PATCH v4 2/2] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant Pali Rohár
2021-01-28 21:50   ` [PATCH v4 0/2] net: sfp: add support for GPON RTL8672/RTL9601C and Ubiquiti U-Fiber patchwork-bot+netdevbpf

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