* [PATCH v1] scsi: ufs: add 2 lane support
@ 2018-03-02 8:18 Can Guo
2018-04-02 10:00 ` Vivek Gautam
2018-10-03 18:34 ` Evan Green
0 siblings, 2 replies; 6+ messages in thread
From: Can Guo @ 2018-03-02 8:18 UTC (permalink / raw)
To: subhashj, asutoshd, vivek.gautam, rnayak, vinholikatti, jejb,
martin.petersen
Cc: linux-scsi, Venkat Gopalakrishnan, Can Guo, open list
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 */
+ 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);
}
out:
return err;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v1] scsi: ufs: add 2 lane support
2018-03-02 8:18 [PATCH v1] scsi: ufs: add 2 lane support Can Guo
@ 2018-04-02 10:00 ` Vivek Gautam
2018-04-12 5:48 ` cang
2018-10-03 18:34 ` Evan Green
1 sibling, 1 reply; 6+ messages in thread
From: Vivek Gautam @ 2018-04-02 10:00 UTC (permalink / raw)
To: Can Guo, subhashj, asutoshd, rnayak, vinholikatti, jejb,
martin.petersen
Cc: linux-scsi, Venkat Gopalakrishnan, open list
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;
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v1] scsi: ufs: add 2 lane support
2018-04-02 10:00 ` Vivek Gautam
@ 2018-04-12 5:48 ` cang
0 siblings, 0 replies; 6+ messages in thread
From: cang @ 2018-04-12 5:48 UTC (permalink / raw)
To: Vivek Gautam
Cc: subhashj, asutoshd, rnayak, vinholikatti, jejb, martin.petersen,
linux-scsi, Venkat Gopalakrishnan, open list
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@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().
>
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;
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v1] scsi: ufs: add 2 lane support
2018-03-02 8:18 [PATCH v1] scsi: ufs: add 2 lane support Can Guo
2018-04-02 10:00 ` Vivek Gautam
@ 2018-10-03 18:34 ` Evan Green
2018-10-08 8:33 ` cang
2018-10-08 8:48 ` cang
1 sibling, 2 replies; 6+ messages in thread
From: Evan Green @ 2018-10-03 18:34 UTC (permalink / raw)
To: subhashj, asutoshd, vivek.gautam, Rajendra Nayak,
Vinayak Holikatti, jejb, martin.petersen
Cc: linux-scsi, venkatg, cang, linux-kernel
Hi,
On Wed, Oct 3, 2018 at 11:19 AM Can Guo <cang@codeaurora.org> 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.
I'm reviving this old chestnut, sorry I missed it initially. This
description is a little terse, and I'm actually confused about it. The
description makes it sounds like this patch is adding support for
2-lane UFS controllers, but the patch itself appears to only make the
UFS controller tolerant of a missing lane (or more specifically, a
missing lane clock). Can you describe a little more about what's going
on here, and perhaps fix the description?
I notice that the global clock controller has clocks for TX symbol 0,
and RX symbol 1, but seems to be missing GCC_UFS_PHY_TX_SYMBOL_1_CLK.
Was that an oversight, or is it really not there?
>
> 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 */
I'm confused by this comment. What do you mean the clock could be muxed?
> + 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);
> }
> out:
> return err;
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v1] scsi: ufs: add 2 lane support
2018-10-03 18:34 ` Evan Green
@ 2018-10-08 8:33 ` cang
2018-10-08 8:48 ` cang
1 sibling, 0 replies; 6+ messages in thread
From: cang @ 2018-10-08 8:33 UTC (permalink / raw)
To: Evan Green
Cc: subhashj, asutoshd, vivek.gautam, Rajendra Nayak,
Vinayak Holikatti, jejb, martin.petersen, linux-scsi, venkatg,
linux-kernel
On 2018-10-04 02:34, Evan Green wrote:
> Hi,
>
> On Wed, Oct 3, 2018 at 11:19 AM Can Guo <cang@codeaurora.org> 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.
>
> I'm reviving this old chestnut, sorry I missed it initially. This
> description is a little terse, and I'm actually confused about it. The
> description makes it sounds like this patch is adding support for
> 2-lane UFS controllers, but the patch itself appears to only make the
> UFS controller tolerant of a missing lane (or more specifically, a
> missing lane clock). Can you describe a little more about what's going
> on here, and perhaps fix the description?
>
> I notice that the global clock controller has clocks for TX symbol 0,
> and RX symbol 1, but seems to be missing GCC_UFS_PHY_TX_SYMBOL_1_CLK.
> Was that an oversight, or is it really not there?
>
>>
>> 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 */
>
> I'm confused by this comment. What do you mean the clock could be
> muxed?
>
Hi Evan, sorry for the late response, I totally missed this mail.
Here it means Tx Lane1 clock can be muxed with Tx Lane0 clock.
As by design, Tx Lane1 clock derives from Tx Lane0 clock.
I pushed a new change of it as I change the commit name.
Please help review the new patch. Sorry for the inconveience.
>> + 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);
>> }
>> out:
>> return err;
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v1] scsi: ufs: add 2 lane support
2018-10-03 18:34 ` Evan Green
2018-10-08 8:33 ` cang
@ 2018-10-08 8:48 ` cang
1 sibling, 0 replies; 6+ messages in thread
From: cang @ 2018-10-08 8:48 UTC (permalink / raw)
To: Evan Green
Cc: subhashj, asutoshd, vivek.gautam, Rajendra Nayak,
Vinayak Holikatti, jejb, martin.petersen, linux-scsi, venkatg,
linux-kernel
Hi Evan,
On 2018-10-04 02:34, Evan Green wrote:
> Hi,
>
> On Wed, Oct 3, 2018 at 11:19 AM Can Guo <cang@codeaurora.org> 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.
>
> I'm reviving this old chestnut, sorry I missed it initially. This
> description is a little terse, and I'm actually confused about it. The
> description makes it sounds like this patch is adding support for
> 2-lane UFS controllers, but the patch itself appears to only make the
> UFS controller tolerant of a missing lane (or more specifically, a
> missing lane clock). Can you describe a little more about what's going
> on here, and perhaps fix the description?
>
> I notice that the global clock controller has clocks for TX symbol 0,
> and RX symbol 1, but seems to be missing GCC_UFS_PHY_TX_SYMBOL_1_CLK.
> Was that an oversight, or is it really not there?
>
You are right. The name and commit message are not representing itself
correctly as most of the original commit has been upstreamed already.
I uploaded a new patch to address it.
As per Qcom's design Tx Lane1 clock derives from Tx Lane0. So only
one Tx Lane0 clock would make 2 Tx lanes work.
>>
>> 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 */
>
> I'm confused by this comment. What do you mean the clock could be
> muxed?
>
>> + 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);
>> }
>> out:
>> return err;
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-10-08 8:48 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-03-02 8:18 [PATCH v1] scsi: ufs: add 2 lane support Can Guo
2018-04-02 10:00 ` Vivek Gautam
2018-04-12 5:48 ` cang
2018-10-03 18:34 ` Evan Green
2018-10-08 8:33 ` cang
2018-10-08 8:48 ` cang
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