* [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk [not found] <1606356063-38380-1-git-send-email-cang@codeaurora.org> @ 2020-11-26 2:01 ` Can Guo 2020-11-30 23:01 ` Asutosh Das (asd) 0 siblings, 1 reply; 4+ messages in thread From: Can Guo @ 2020-11-26 2:01 UTC (permalink / raw) To: asutoshd, nguyenb, hongwus, ziqichen, rnayak, linux-scsi, kernel-team, saravanak, salyzyn, cang Cc: Bart Van Assche, Martin K. Petersen, James E.J. Bottomley, open list, Satya Tangirala, Avri Altman, moderated list:ARM/Mediatek SoC support, Alim Akhtar, Matthias Brugger, Tomas Winkler, Stanley Chu, moderated list:ARM/Mediatek SoC support, Bean Huo Remove the param skip_ref_clk from __ufshcd_setup_clocks(), but keep a flag in struct ufs_clk_info to tell whether a clock can be disabled or not while the link is active. Reviewed-by: Hongwu Su<hongwus@codeaurora.org> Reviewed-by: Bean Huo <beanhuo@micron.com> Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Can Guo <cang@codeaurora.org> --- drivers/scsi/ufs/ufshcd-pltfrm.c | 2 ++ drivers/scsi/ufs/ufshcd.c | 29 +++++++++-------------------- drivers/scsi/ufs/ufshcd.h | 3 +++ 3 files changed, 14 insertions(+), 20 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c index 3db0af6..873ef14 100644 --- a/drivers/scsi/ufs/ufshcd-pltfrm.c +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c @@ -92,6 +92,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba) clki->min_freq = clkfreq[i]; clki->max_freq = clkfreq[i+1]; clki->name = kstrdup(name, GFP_KERNEL); + if (!strcmp(name, "ref_clk")) + clki->keep_link_active = true; dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz", clki->min_freq, clki->max_freq, clki->name); list_add_tail(&clki->list, &hba->clk_list_head); diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index a7857f6..44254c9 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -221,8 +221,6 @@ static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd); static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag); static void ufshcd_hba_exit(struct ufs_hba *hba); static int ufshcd_probe_hba(struct ufs_hba *hba, bool async); -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_enter(struct ufs_hba *hba); static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba); @@ -1707,11 +1705,7 @@ static void ufshcd_gate_work(struct work_struct *work) ufshcd_disable_irq(hba); - if (!ufshcd_is_link_active(hba)) - ufshcd_setup_clocks(hba, false); - else - /* If link is active, device ref_clk can't be switched off */ - __ufshcd_setup_clocks(hba, false, true); + ufshcd_setup_clocks(hba, false); /* * In case you are here to cancel this work the gating state @@ -7990,8 +7984,7 @@ static int ufshcd_init_hba_vreg(struct ufs_hba *hba) return 0; } -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) { int ret = 0; struct ufs_clk_info *clki; @@ -8009,7 +8002,12 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on, list_for_each_entry(clki, head, list) { if (!IS_ERR_OR_NULL(clki->clk)) { - if (skip_ref_clk && !strcmp(clki->name, "ref_clk")) + /* + * Don't disable clocks which are needed + * to keep the link active. + */ + if (ufshcd_is_link_active(hba) && + clki->keep_link_active) continue; clk_state_changed = on ^ clki->enabled; @@ -8054,11 +8052,6 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on, return ret; } -static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on) -{ - return __ufshcd_setup_clocks(hba, on, false); -} - static int ufshcd_init_clocks(struct ufs_hba *hba) { int ret = 0; @@ -8577,11 +8570,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) */ ufshcd_disable_irq(hba); - if (!ufshcd_is_link_active(hba)) - ufshcd_setup_clocks(hba, false); - else - /* If link is active, device ref_clk can't be switched off */ - __ufshcd_setup_clocks(hba, false, true); + ufshcd_setup_clocks(hba, false); if (ufshcd_is_clkgating_allowed(hba)) { hba->clk_gating.state = CLKS_OFF; diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 66e5338..6f0f2d4 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -229,6 +229,8 @@ struct ufs_dev_cmd { * @max_freq: maximum frequency supported by the clock * @min_freq: min frequency that can be used for clock scaling * @curr_freq: indicates the current frequency that it is set to + * @keep_link_active: indicates that the clk should not be disabled if + link is active * @enabled: variable to check against multiple enable/disable */ struct ufs_clk_info { @@ -238,6 +240,7 @@ struct ufs_clk_info { u32 max_freq; u32 min_freq; u32 curr_freq; + bool keep_link_active; bool enabled; }; -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project. _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk 2020-11-26 2:01 ` [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk Can Guo @ 2020-11-30 23:01 ` Asutosh Das (asd) 2020-12-01 3:11 ` Can Guo 0 siblings, 1 reply; 4+ messages in thread From: Asutosh Das (asd) @ 2020-11-30 23:01 UTC (permalink / raw) To: Can Guo, nguyenb, hongwus, ziqichen, rnayak, linux-scsi, kernel-team, saravanak, salyzyn Cc: Bart Van Assche, Martin K. Petersen, James E.J. Bottomley, open list, Satya Tangirala, Avri Altman, moderated list:ARM/Mediatek SoC support, Alim Akhtar, Matthias Brugger, Tomas Winkler, Stanley Chu, moderated list:ARM/Mediatek SoC support, Bean Huo On 11/25/2020 6:01 PM, Can Guo wrote: > Remove the param skip_ref_clk from __ufshcd_setup_clocks(), but keep a flag > in struct ufs_clk_info to tell whether a clock can be disabled or not while > the link is active. > > Reviewed-by: Hongwu Su<hongwus@codeaurora.org> > Reviewed-by: Bean Huo <beanhuo@micron.com> > Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> > Signed-off-by: Can Guo <cang@codeaurora.org> > --- > drivers/scsi/ufs/ufshcd-pltfrm.c | 2 ++ > drivers/scsi/ufs/ufshcd.c | 29 +++++++++-------------------- > drivers/scsi/ufs/ufshcd.h | 3 +++ > 3 files changed, 14 insertions(+), 20 deletions(-) > > diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c > index 3db0af6..873ef14 100644 > --- a/drivers/scsi/ufs/ufshcd-pltfrm.c > +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c > @@ -92,6 +92,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba) > clki->min_freq = clkfreq[i]; > clki->max_freq = clkfreq[i+1]; > clki->name = kstrdup(name, GFP_KERNEL); > + if (!strcmp(name, "ref_clk")) > + clki->keep_link_active = true; > dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz", > clki->min_freq, clki->max_freq, clki->name); > list_add_tail(&clki->list, &hba->clk_list_head); > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index a7857f6..44254c9 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -221,8 +221,6 @@ static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd); > static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag); > static void ufshcd_hba_exit(struct ufs_hba *hba); > static int ufshcd_probe_hba(struct ufs_hba *hba, bool async); > -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_enter(struct ufs_hba *hba); > static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba); > @@ -1707,11 +1705,7 @@ static void ufshcd_gate_work(struct work_struct *work) > > ufshcd_disable_irq(hba); > > - if (!ufshcd_is_link_active(hba)) > - ufshcd_setup_clocks(hba, false); > - else > - /* If link is active, device ref_clk can't be switched off */ > - __ufshcd_setup_clocks(hba, false, true); > + ufshcd_setup_clocks(hba, false); > > /* > * In case you are here to cancel this work the gating state > @@ -7990,8 +7984,7 @@ static int ufshcd_init_hba_vreg(struct ufs_hba *hba) > return 0; > } > > -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) > { > int ret = 0; > struct ufs_clk_info *clki; > @@ -8009,7 +8002,12 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on, > > list_for_each_entry(clki, head, list) { > if (!IS_ERR_OR_NULL(clki->clk)) { > - if (skip_ref_clk && !strcmp(clki->name, "ref_clk")) > + /* > + * Don't disable clocks which are needed > + * to keep the link active. > + */ > + if (ufshcd_is_link_active(hba) && > + clki->keep_link_active) > continue; > > clk_state_changed = on ^ clki->enabled; > @@ -8054,11 +8052,6 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on, > return ret; > } > > -static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on) > -{ > - return __ufshcd_setup_clocks(hba, on, false); > -} > - > static int ufshcd_init_clocks(struct ufs_hba *hba) > { > int ret = 0; > @@ -8577,11 +8570,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) > */ > ufshcd_disable_irq(hba); > > - if (!ufshcd_is_link_active(hba)) > - ufshcd_setup_clocks(hba, false); > - else > - /* If link is active, device ref_clk can't be switched off */ > - __ufshcd_setup_clocks(hba, false, true); > + ufshcd_setup_clocks(hba, false); > > if (ufshcd_is_clkgating_allowed(hba)) { > hba->clk_gating.state = CLKS_OFF; > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h > index 66e5338..6f0f2d4 100644 > --- a/drivers/scsi/ufs/ufshcd.h > +++ b/drivers/scsi/ufs/ufshcd.h > @@ -229,6 +229,8 @@ struct ufs_dev_cmd { > * @max_freq: maximum frequency supported by the clock > * @min_freq: min frequency that can be used for clock scaling > * @curr_freq: indicates the current frequency that it is set to > + * @keep_link_active: indicates that the clk should not be disabled if > + link is active > * @enabled: variable to check against multiple enable/disable > */ > struct ufs_clk_info { > @@ -238,6 +240,7 @@ struct ufs_clk_info { > u32 max_freq; > u32 min_freq; > u32 curr_freq; > + bool keep_link_active; Nitpick - How about 'always-on' instead of 'keep_link_active'? > bool enabled; > }; > > -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, Linux Foundation Collaborative Project _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk 2020-11-30 23:01 ` Asutosh Das (asd) @ 2020-12-01 3:11 ` Can Guo 2020-12-01 16:47 ` Asutosh Das (asd) 0 siblings, 1 reply; 4+ messages in thread From: Can Guo @ 2020-12-01 3:11 UTC (permalink / raw) To: Asutosh Das (asd) Cc: moderated list:ARM/Mediatek SoC support, Satya Tangirala, rnayak, saravanak, linux-scsi, open list, James E.J. Bottomley, nguyenb, ziqichen, Avri Altman, moderated list:ARM/Mediatek SoC support, salyzyn, Alim Akhtar, Martin K. Petersen, Matthias Brugger, Tomas Winkler, Stanley Chu, kernel-team, Bart Van Assche, hongwus, Bean Huo On 2020-12-01 07:01, Asutosh Das (asd) wrote: > On 11/25/2020 6:01 PM, Can Guo wrote: >> Remove the param skip_ref_clk from __ufshcd_setup_clocks(), but keep a >> flag >> in struct ufs_clk_info to tell whether a clock can be disabled or not >> while >> the link is active. >> >> Reviewed-by: Hongwu Su<hongwus@codeaurora.org> >> Reviewed-by: Bean Huo <beanhuo@micron.com> >> Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> >> Signed-off-by: Can Guo <cang@codeaurora.org> >> --- >> drivers/scsi/ufs/ufshcd-pltfrm.c | 2 ++ >> drivers/scsi/ufs/ufshcd.c | 29 +++++++++-------------------- >> drivers/scsi/ufs/ufshcd.h | 3 +++ >> 3 files changed, 14 insertions(+), 20 deletions(-) >> >> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c >> b/drivers/scsi/ufs/ufshcd-pltfrm.c >> index 3db0af6..873ef14 100644 >> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c >> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c >> @@ -92,6 +92,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba >> *hba) >> clki->min_freq = clkfreq[i]; >> clki->max_freq = clkfreq[i+1]; >> clki->name = kstrdup(name, GFP_KERNEL); >> + if (!strcmp(name, "ref_clk")) >> + clki->keep_link_active = true; >> dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz", >> clki->min_freq, clki->max_freq, clki->name); >> list_add_tail(&clki->list, &hba->clk_list_head); >> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c >> index a7857f6..44254c9 100644 >> --- a/drivers/scsi/ufs/ufshcd.c >> +++ b/drivers/scsi/ufs/ufshcd.c >> @@ -221,8 +221,6 @@ static int ufshcd_eh_host_reset_handler(struct >> scsi_cmnd *cmd); >> static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag); >> static void ufshcd_hba_exit(struct ufs_hba *hba); >> static int ufshcd_probe_hba(struct ufs_hba *hba, bool async); >> -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_enter(struct ufs_hba *hba); >> static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba >> *hba); >> @@ -1707,11 +1705,7 @@ static void ufshcd_gate_work(struct work_struct >> *work) >> ufshcd_disable_irq(hba); >> - if (!ufshcd_is_link_active(hba)) >> - ufshcd_setup_clocks(hba, false); >> - else >> - /* If link is active, device ref_clk can't be switched off */ >> - __ufshcd_setup_clocks(hba, false, true); >> + ufshcd_setup_clocks(hba, false); >> /* >> * In case you are here to cancel this work the gating state >> @@ -7990,8 +7984,7 @@ static int ufshcd_init_hba_vreg(struct ufs_hba >> *hba) >> return 0; >> } >> -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) >> { >> int ret = 0; >> struct ufs_clk_info *clki; >> @@ -8009,7 +8002,12 @@ static int __ufshcd_setup_clocks(struct ufs_hba >> *hba, bool on, >> list_for_each_entry(clki, head, list) { >> if (!IS_ERR_OR_NULL(clki->clk)) { >> - if (skip_ref_clk && !strcmp(clki->name, "ref_clk")) >> + /* >> + * Don't disable clocks which are needed >> + * to keep the link active. >> + */ >> + if (ufshcd_is_link_active(hba) && >> + clki->keep_link_active) >> continue; >> clk_state_changed = on ^ clki->enabled; >> @@ -8054,11 +8052,6 @@ static int __ufshcd_setup_clocks(struct ufs_hba >> *hba, bool on, >> return ret; >> } >> -static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on) >> -{ >> - return __ufshcd_setup_clocks(hba, on, false); >> -} >> - >> static int ufshcd_init_clocks(struct ufs_hba *hba) >> { >> int ret = 0; >> @@ -8577,11 +8570,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, >> enum ufs_pm_op pm_op) >> */ >> ufshcd_disable_irq(hba); >> - if (!ufshcd_is_link_active(hba)) >> - ufshcd_setup_clocks(hba, false); >> - else >> - /* If link is active, device ref_clk can't be switched off */ >> - __ufshcd_setup_clocks(hba, false, true); >> + ufshcd_setup_clocks(hba, false); >> if (ufshcd_is_clkgating_allowed(hba)) { >> hba->clk_gating.state = CLKS_OFF; >> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h >> index 66e5338..6f0f2d4 100644 >> --- a/drivers/scsi/ufs/ufshcd.h >> +++ b/drivers/scsi/ufs/ufshcd.h >> @@ -229,6 +229,8 @@ struct ufs_dev_cmd { >> * @max_freq: maximum frequency supported by the clock >> * @min_freq: min frequency that can be used for clock scaling >> * @curr_freq: indicates the current frequency that it is set to >> + * @keep_link_active: indicates that the clk should not be disabled >> if >> + link is active >> * @enabled: variable to check against multiple enable/disable >> */ >> struct ufs_clk_info { >> @@ -238,6 +240,7 @@ struct ufs_clk_info { >> u32 max_freq; >> u32 min_freq; >> u32 curr_freq; >> + bool keep_link_active; > > Nitpick - How about 'always-on' instead of 'keep_link_active'? Hi Asutosh, But it is not always-on, during suspend, it is on when rpm/spm-lvl is 1 and 2, off when rpm/spm-lvl is 3, 4 and 5, depending on the link state. Thanks, Can Guo. >> bool enabled; >> }; >> _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk 2020-12-01 3:11 ` Can Guo @ 2020-12-01 16:47 ` Asutosh Das (asd) 0 siblings, 0 replies; 4+ messages in thread From: Asutosh Das (asd) @ 2020-12-01 16:47 UTC (permalink / raw) To: Can Guo Cc: moderated list:ARM/Mediatek SoC support, Satya Tangirala, rnayak, saravanak, linux-scsi, open list, James E.J. Bottomley, nguyenb, ziqichen, Avri Altman, moderated list:ARM/Mediatek SoC support, salyzyn, Alim Akhtar, Martin K. Petersen, Matthias Brugger, Tomas Winkler, Stanley Chu, kernel-team, Bart Van Assche, hongwus, Bean Huo On 11/30/2020 7:11 PM, Can Guo wrote: > On 2020-12-01 07:01, Asutosh Das (asd) wrote: >> On 11/25/2020 6:01 PM, Can Guo wrote: >>> Remove the param skip_ref_clk from __ufshcd_setup_clocks(), but keep >>> a flag >>> in struct ufs_clk_info to tell whether a clock can be disabled or not >>> while >>> the link is active. >>> >>> Reviewed-by: Hongwu Su<hongwus@codeaurora.org> >>> Reviewed-by: Bean Huo <beanhuo@micron.com> >>> Reviewed-by: Stanley Chu <stanley.chu@mediatek.com> >>> Signed-off-by: Can Guo <cang@codeaurora.org> >>> --- >>> drivers/scsi/ufs/ufshcd-pltfrm.c | 2 ++ >>> drivers/scsi/ufs/ufshcd.c | 29 +++++++++-------------------- >>> drivers/scsi/ufs/ufshcd.h | 3 +++ >>> 3 files changed, 14 insertions(+), 20 deletions(-) >>> >>> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c >>> b/drivers/scsi/ufs/ufshcd-pltfrm.c >>> index 3db0af6..873ef14 100644 >>> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c >>> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c >>> @@ -92,6 +92,8 @@ static int ufshcd_parse_clock_info(struct ufs_hba >>> *hba) >>> clki->min_freq = clkfreq[i]; >>> clki->max_freq = clkfreq[i+1]; >>> clki->name = kstrdup(name, GFP_KERNEL); >>> + if (!strcmp(name, "ref_clk")) >>> + clki->keep_link_active = true; >>> dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz", >>> clki->min_freq, clki->max_freq, clki->name); >>> list_add_tail(&clki->list, &hba->clk_list_head); >>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c >>> index a7857f6..44254c9 100644 >>> --- a/drivers/scsi/ufs/ufshcd.c >>> +++ b/drivers/scsi/ufs/ufshcd.c >>> @@ -221,8 +221,6 @@ static int ufshcd_eh_host_reset_handler(struct >>> scsi_cmnd *cmd); >>> static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag); >>> static void ufshcd_hba_exit(struct ufs_hba *hba); >>> static int ufshcd_probe_hba(struct ufs_hba *hba, bool async); >>> -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_enter(struct ufs_hba *hba); >>> static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba >>> *hba); >>> @@ -1707,11 +1705,7 @@ static void ufshcd_gate_work(struct >>> work_struct *work) >>> ufshcd_disable_irq(hba); >>> - if (!ufshcd_is_link_active(hba)) >>> - ufshcd_setup_clocks(hba, false); >>> - else >>> - /* If link is active, device ref_clk can't be switched off */ >>> - __ufshcd_setup_clocks(hba, false, true); >>> + ufshcd_setup_clocks(hba, false); >>> /* >>> * In case you are here to cancel this work the gating state >>> @@ -7990,8 +7984,7 @@ static int ufshcd_init_hba_vreg(struct ufs_hba >>> *hba) >>> return 0; >>> } >>> -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) >>> { >>> int ret = 0; >>> struct ufs_clk_info *clki; >>> @@ -8009,7 +8002,12 @@ static int __ufshcd_setup_clocks(struct >>> ufs_hba *hba, bool on, >>> list_for_each_entry(clki, head, list) { >>> if (!IS_ERR_OR_NULL(clki->clk)) { >>> - if (skip_ref_clk && !strcmp(clki->name, "ref_clk")) >>> + /* >>> + * Don't disable clocks which are needed >>> + * to keep the link active. >>> + */ >>> + if (ufshcd_is_link_active(hba) && >>> + clki->keep_link_active) >>> continue; >>> clk_state_changed = on ^ clki->enabled; >>> @@ -8054,11 +8052,6 @@ static int __ufshcd_setup_clocks(struct >>> ufs_hba *hba, bool on, >>> return ret; >>> } >>> -static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on) >>> -{ >>> - return __ufshcd_setup_clocks(hba, on, false); >>> -} >>> - >>> static int ufshcd_init_clocks(struct ufs_hba *hba) >>> { >>> int ret = 0; >>> @@ -8577,11 +8570,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, >>> enum ufs_pm_op pm_op) >>> */ >>> ufshcd_disable_irq(hba); >>> - if (!ufshcd_is_link_active(hba)) >>> - ufshcd_setup_clocks(hba, false); >>> - else >>> - /* If link is active, device ref_clk can't be switched off */ >>> - __ufshcd_setup_clocks(hba, false, true); >>> + ufshcd_setup_clocks(hba, false); >>> if (ufshcd_is_clkgating_allowed(hba)) { >>> hba->clk_gating.state = CLKS_OFF; >>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h >>> index 66e5338..6f0f2d4 100644 >>> --- a/drivers/scsi/ufs/ufshcd.h >>> +++ b/drivers/scsi/ufs/ufshcd.h >>> @@ -229,6 +229,8 @@ struct ufs_dev_cmd { >>> * @max_freq: maximum frequency supported by the clock >>> * @min_freq: min frequency that can be used for clock scaling >>> * @curr_freq: indicates the current frequency that it is set to >>> + * @keep_link_active: indicates that the clk should not be disabled if >>> + link is active >>> * @enabled: variable to check against multiple enable/disable >>> */ >>> struct ufs_clk_info { >>> @@ -238,6 +240,7 @@ struct ufs_clk_info { >>> u32 max_freq; >>> u32 min_freq; >>> u32 curr_freq; >>> + bool keep_link_active; >> >> Nitpick - How about 'always-on' instead of 'keep_link_active'? > > Hi Asutosh, > > But it is not always-on, during suspend, it is on when rpm/spm-lvl is 1 > and 2, off when rpm/spm-lvl is 3, 4 and 5, depending on the link state. > Understood & agree. > Thanks, > > Can Guo. > >>> bool enabled; >>> }; >>> -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, Linux Foundation Collaborative Project _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek ^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-11-26 2:01 ` [PATCH v3 1/2] scsi: ufs: Refactor ufshcd_setup_clocks() to remove skip_ref_clk Can Guo
2020-11-30 23:01 ` Asutosh Das (asd)
2020-12-01 3:11 ` Can Guo
2020-12-01 16:47 ` Asutosh Das (asd)
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