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SubjectRe: [PATCH v1] scsi: ufs: add 2 lane support
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Hi Can,


On 3/2/2018 1:48 PM, Can Guo wrote:
> From: Venkat Gopalakrishnan <venkatg@codeaurora.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@codeaurora.org>
> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
> Signed-off-by: Can Guo <cang@codeaurora.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;

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