[PATCH v5 05/12] arm: mvebu: clearfog: Add option for 2.5 Gbps SFP

[Baruch Siach]

Hi Stefan,

On Mon, Mar 23 2020, Stefan Roese wrote:

> On 27.01.20 21:01, Joel Johnson wrote:
>> While newer Linux kernels provide autoconfiguration of SFP, provide
>> an option for setting in U-Boot Kconfig for use prior to booting.
>>
>> Signed-off-by: Joel Johnson <mrjoel at lixil.net>
>>
>> ---
>>
>> v2 changes:
>>    - fixed help indentation
>> v3 changes:
>>    - none
>> v4 changes:
>>    - adjust static SerDes configuration at runtime instead of #ifdef
>> v5 changes:
>>    - make independent of runtime detection
>>
>> ---
>>   board/solidrun/clearfog/Kconfig    | 7 +++++++
>>   board/solidrun/clearfog/clearfog.c | 5 +++++
>>   2 files changed, 12 insertions(+)
>>
>> diff --git a/board/solidrun/clearfog/Kconfig b/board/solidrun/clearfog/Kconfig
>> index 936d5918f8..c910e17093 100644
>> --- a/board/solidrun/clearfog/Kconfig
>> +++ b/board/solidrun/clearfog/Kconfig
>> @@ -15,4 +15,11 @@ config TARGET_CLEARFOG_BASE
>>   	  detection via additional EEPROM hardware. This option enables selecting
>>   	  the Base variant for older hardware revisions.
>>   +config CLEARFOG_SFP_25GB
>> +	bool "Enable 2.5 Gbps mode for SFP"
>> +	help
>> +	  Set the SFP module connection to support 2.5 Gbps transfer speed for the
>> +	  SGMII connection (requires a supporting SFP). By default, transfer speed
>> +	  of 1.25 Gbps is used, suitable for a more common 1 Gbps SFP module.
>> +
>>   endmenu
>> diff --git a/board/solidrun/clearfog/clearfog.c b/board/solidrun/clearfog/clearfog.c
>> index c873d00905..064ce4e520 100644
>> --- a/board/solidrun/clearfog/clearfog.c
>> +++ b/board/solidrun/clearfog/clearfog.c
>> @@ -63,6 +63,11 @@ int hws_board_topology_load(struct serdes_map **serdes_map_array, u8 *count)
>>   {
>>   	cf_read_tlv_data();
>>   +	/* Apply build configuration options before runtime configuration */
>> +	if (IS_ENABLED(CONFIG_CLEARFOG_SFP_25GB))
>> +		board_serdes_map[5].serdes_speed = SERDES_SPEED_3_125_GBPS;
>
> Just checking: Your option is for 2.5 gbps and you configure here to
> 3.125 gpbs. Is this intended?

This is intended. Serdes encoding is 8b/10b. So for 2.5Gbps you need
serdes rate of 3.125Gbps. For 1Gbps we already set 1.25Gpbs serdes rate
(SERDES_SPEED_1_25_GBPS) in board_serdes_map[].

baruch

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