lkml.org 
[lkml]   [2018]   [Jul]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v1 7/9] scsi: ufs: add UFS power collapse support during hibern8
From
Date
On 7/21/2018 5:28 AM, Subhash Jadavani wrote:
> On 2018-07-06 05:30, Asutosh Das wrote:
>> From: Subhash Jadavani <subhashj@codeaurora.org>
>>
>> UFS host controller hardware may allow the host controller
>> to be power collapsed when UFS link is hibern8 state, this
>> change allows the UFS host controller to be power collapsed
>> during hibern8.
>>
>> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
>> Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
>> Signed-off-by: Can Guo <cang@codeaurora.org>
>> Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
>> ---
>>  drivers/scsi/ufs/ufshcd.c |  8 ++++++--
>>  drivers/scsi/ufs/ufshcd.h | 13 ++++++++++++-
>>  2 files changed, 18 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 40d9c35..50588cf 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -7673,13 +7673,17 @@ static int ufshcd_vreg_set_hpm(struct ufs_hba
>> *hba)
>>
>>  static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba)
>>  {
>> -    if (ufshcd_is_link_off(hba))
>> +    if (ufshcd_is_link_off(hba) ||
>> +        (ufshcd_is_link_hibern8(hba)
>> +         && ufshcd_is_power_collapse_during_hibern8_allowed(hba)))
>>          ufshcd_setup_hba_vreg(hba, false);
>
> I guess we have to handle the UFS host controller power collapse via
> "power-domains" which would requires us to specify the "power-domains"
> attribute under UFS controller's DT node and then linux core power
> framework should automatically collapse the UFS controller post runtime
> suspend. This also means we can't power collapse UFS controller
> aggressively (as part of clock gating) but it should still be fine from
> power point of view.
>
>>  }
>>
>>  static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
>>  {
>> -    if (ufshcd_is_link_off(hba))
>> +    if (ufshcd_is_link_off(hba) ||
>> +        (ufshcd_is_link_hibern8(hba)
>> +         && ufshcd_is_power_collapse_during_hibern8_allowed(hba)))
>>          ufshcd_setup_hba_vreg(hba, true);
>>  }
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index f79a639..8c5f987 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -728,7 +728,12 @@ struct ufs_hba {
>>       * to do background operation when it's active but it might degrade
>>       * the performance of ongoing read/write operations.
>>       */
>> -#define UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND (1 << 5)
>> +#define UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND (1 << 6)
>> +    /*
>> +     * If host controller hardware can be power collapsed when UFS
>> link is
>> +     * in hibern8 then enable this cap.
>> +     */
>> +#define UFSHCD_CAP_POWER_COLLAPSE_DURING_HIBERN8 (1 << 7)
>>
>>      struct devfreq *devfreq;
>>      struct ufs_clk_scaling clk_scaling;
>> @@ -764,6 +769,12 @@ static inline bool
>> ufshcd_is_hibern8_on_idle_allowed(struct ufs_hba *hba)
>>      return hba->caps & UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE;
>>  }
>>
>> +static inline bool ufshcd_is_power_collapse_during_hibern8_allowed(
>> +                        struct ufs_hba *hba)
>> +{
>> +    return !!(hba->caps & UFSHCD_CAP_POWER_COLLAPSE_DURING_HIBERN8);
>> +}
>> +
>>  static inline bool ufshcd_is_intr_aggr_allowed(struct ufs_hba *hba)
>>  {
>>  /* DWC UFS Core has the Interrupt aggregation feature but is not
>> detectable*/
>

Thanks. I'll check the 'power-domains' part and get back with the changes.


--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project

\
 
 \ /
  Last update: 2018-07-23 05:07    [W:0.080 / U:1.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site