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Date: Thu, 17 Sep 2015 14:01:50 +0530
From: Alim Akhtar <alim.akhtar@...sung.com>
To: amit daniel kachhap <amit.daniel@...sung.com>
Cc: linux-scsi@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
vinholikatti@...il.com, JBottomley@...n.com, essuuj@...il.com
Subject: Re: [PATCH 07/10] scsi: ufs: add add specific callback for hibern8
Hi Amit,
On 08/26/2015 11:51 AM, amit daniel kachhap wrote:
> On Fri, Aug 21, 2015 at 2:57 PM, Alim Akhtar <alim.akhtar@...sung.com> wrote:
>> From: Seungwon Jeon <tgih.jun@...sung.com>
>>
>> Some host controller needs specific handling before/after
>> (un)hibernation, This change adds specific callback function
>> to support vendor's implementation.
>>
>> Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>> ---
>> drivers/scsi/ufs/ufshcd.c | 36 ++++++++++++++++++++++++++++++++----
>> drivers/scsi/ufs/ufshcd.h | 3 +++
>> 2 files changed, 35 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index bc27f5e..d425ea1 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -181,8 +181,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba);
>> static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
>> bool skip_ref_clk);
>> static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
>> -static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
>> -static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
>> +static int ufshcd_uic_hibern8_ctrl(struct ufs_hba *hba, bool en);
>> static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
>> static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
>> static irqreturn_t ufshcd_intr(int irq, void *__hba);
>> @@ -215,6 +214,16 @@ static inline void ufshcd_disable_irq(struct ufs_hba *hba)
>> }
>> }
>>
>> +static inline int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>> +{
>> + return ufshcd_uic_hibern8_ctrl(hba, true);
>> +}
>> +
>> +static inline int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>> +{
>> + return ufshcd_uic_hibern8_ctrl(hba, false);
>> +}
>> +
>> /*
>> * ufshcd_wait_for_register - wait for register value to change
>> * @hba - per-adapter interface
>> @@ -2395,7 +2404,7 @@ out:
>> return ret;
>> }
>>
>> -static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>> +static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>> {
>> struct uic_command uic_cmd = {0};
>>
>> @@ -2404,7 +2413,7 @@ static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
>> return ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
>> }
>>
>> -static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>> +static int __ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>> {
>> struct uic_command uic_cmd = {0};
>> int ret;
>> @@ -2419,6 +2428,25 @@ static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
>> return ret;
>> }
>>
>> +static int ufshcd_uic_hibern8_ctrl(struct ufs_hba *hba, bool en)
>> +{
>> + int ret;
>> +
>> + if (hba->vops && hba->vops->hibern8_notify)
>> + hba->vops->hibern8_notify(hba, en, PRE_CHANGE);
> Return of hibern8_notify is not checked. Otherwise make the return type void.
ok will change.
>> +
>> + ret = en ? __ufshcd_uic_hibern8_enter(hba) :
>> + __ufshcd_uic_hibern8_exit(hba);
>> + if (ret)
>> + goto out;
>> +
>> + if (hba->vops && hba->vops->hibern8_notify)
>> + hba->vops->hibern8_notify(hba, en, POST_CHANGE);
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> /**
>> * ufshcd_init_pwr_info - setting the POR (power on reset)
>> * values in hba power info
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 0b7dde0..045968e 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -260,6 +260,8 @@ struct ufs_pwr_mode_info {
>> * @specify_nexus_t_xfer_req:
>> * @specify_nexus_t_tm_req: called before command is issued to allow vendor
>> * specific handling to be set for nexus type.
>> + * @hibern8_notify: called before and after hibernate/unhibernate is carried out
>> + * to allow vendor spesific implementation.
>> * @suspend: called during host controller PM callback
>> * @resume: called during host controller PM callback
>> */
>> @@ -276,6 +278,7 @@ struct ufs_hba_variant_ops {
>> int (*pwr_change_notify)(struct ufs_hba *,
>> bool, struct ufs_pa_layer_attr *,
>> struct ufs_pa_layer_attr *);
>> + int (*hibern8_notify)(struct ufs_hba *, bool, bool);
>> void (*specify_nexus_t_xfer_req)(struct ufs_hba *,
>> int, struct scsi_cmnd *);
>> void (*specify_nexus_t_tm_req)(struct ufs_hba *, int, u8);
>> --
>> 1.7.10.4
>>
>> --
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