linux-kernel - Re: [PATCH v1] scsi: ufs: add 2 lane support

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Date:   Thu, 12 Apr 2018 13:48:18 +0800
From:   cang@...eaurora.org
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     subhashj@...eaurora.org, asutoshd@...eaurora.org,
        rnayak@...eaurora.org, vinholikatti@...il.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] scsi: ufs: add 2 lane support

On 2018-04-02 18:00, Vivek Gautam wrote:
> Hi Can,
> 
> 
> On 3/2/2018 1:48 PM, Can Guo wrote:
>> From: Venkat Gopalakrishnan <venkatg@...eaurora.org>
>> 
>> Qcom ufs controller v3.1.0 supports 2 lanes, add support
>> to configure 2 lanes during phy initialization.
>> 
>> Signed-off-by: Venkat Gopalakrishnan <venkatg@...eaurora.org>
>> Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> ---
>>   drivers/scsi/ufs/ufs-qcom.c | 20 +++++++++-----------
>>   1 file changed, 9 insertions(+), 11 deletions(-)
>> 
>> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
>> index 2b38db2..51889ad 100644
>> --- a/drivers/scsi/ufs/ufs-qcom.c
>> +++ b/drivers/scsi/ufs/ufs-qcom.c
>> @@ -113,10 +113,10 @@ static void ufs_qcom_disable_lane_clks(struct 
>> ufs_qcom_host *host)
>>   	if (!host->is_lane_clks_enabled)
>>   		return;
>>   -	if (host->hba->lanes_per_direction > 1)
>> +	if (host->tx_l1_sync_clk)
>>   		clk_disable_unprepare(host->tx_l1_sync_clk);
>>   	clk_disable_unprepare(host->tx_l0_sync_clk);
>> -	if (host->hba->lanes_per_direction > 1)
>> +	if (host->rx_l1_sync_clk)
>>   		clk_disable_unprepare(host->rx_l1_sync_clk);
>>   	clk_disable_unprepare(host->rx_l0_sync_clk);
>>   @@ -147,18 +147,15 @@ static int ufs_qcom_enable_lane_clks(struct 
>> ufs_qcom_host *host)
>>   		if (err)
>>   			goto disable_tx_l0;
>>   -		err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk",
>> -			host->tx_l1_sync_clk);
>> -		if (err)
>> -			goto disable_rx_l1;
>> +		/* The tx lane1 clk could be muxed, hence keep this optional */
> 
> You need a similar change for "rx_l1_sync_clk" also.
> And also get rid of 'lanes_per_direction' flag as well for
> ufs_qcom_enable_lane_clks()
> and ufs_qcom_init_lane_clks() too, as you are doing in
> ufs_qcom_disable_lane_clks().
> 

Sure, got it.

Thanks
Can

>> +		if (host->tx_l1_sync_clk)
>> +			ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk",
>> +						 host->tx_l1_sync_clk);
>>   	}
>>     	host->is_lane_clks_enabled = true;
>>   	goto out;
>>   -disable_rx_l1:
>> -	if (host->hba->lanes_per_direction > 1)
>> -		clk_disable_unprepare(host->rx_l1_sync_clk);
>>   disable_tx_l0:
>>   	clk_disable_unprepare(host->tx_l0_sync_clk);
>>   disable_rx_l0:
>> @@ -189,8 +186,9 @@ static int ufs_qcom_init_lane_clks(struct 
>> ufs_qcom_host *host)
>>   		if (err)
>>   			goto out;
>>   -		err = ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk",
>> -			&host->tx_l1_sync_clk);
>> +		/* The tx lane1 clk could be muxed, hence keep this optional */
>> +		ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk",
>> +					&host->tx_l1_sync_clk);
> 
> same here.
> 
> Best regards
> Vivek
> 

Shall do as well.

Thanks
Can

>>   	}
>>   out:
>>   	return err;