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

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Date:   Mon, 2 Apr 2018 15:30:49 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Can Guo <cang@...eaurora.org>, subhashj@...eaurora.org,
        asutoshd@...eaurora.org, rnayak@...eaurora.org,
        vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     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

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().

> +		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

>   	}
>   out:
>   	return err;