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Message-ID: <20170905072105.hmdbvis2qc6wnxeb@dell>
Date: Tue, 5 Sep 2017 08:21:05 +0100
From: Lee Jones <lee.jones@...aro.org>
To: 冯锐 <rui_feng@...lsil.com.cn>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 答复: [PATCH v4] mfd: Add support
for RTS5250S power saving
On Tue, 05 Sep 2017, 冯锐 wrote:
> Dear Jones,
>
> > +static void rts5250_set_l1off_cfg_sub_d0(struct rtsx_pcr *pcr, int
> > +active) {
> > + struct rtsx_cr_option *option = &(pcr->option);
> > +
> > + u32 interrupt = rtsx_pci_readl(pcr, RTSX_BIPR);
> > + int card_exist = (interrupt & SD_EXIST) | (interrupt & MS_EXIST);
> > + int aspm_L1_1, aspm_L1_2;
> > + u8 val = 0;
>
> No need to pre-allocate.
All of my responses should now be quotes, but they are not.
This makes replying to your messages difficult.
Please fix your editor.
> If val is not pre-allocated, what will the val be if it is not assigned before using?
You do not use it before assigning it.
> > + aspm_L1_1 = rtsx_check_dev_flag(pcr, ASPM_L1_1_EN);
> > + aspm_L1_2 = rtsx_check_dev_flag(pcr, ASPM_L1_2_EN);
> > +
> > + if (active) {
> > + /* run, latency: 60us */
> > + if (aspm_L1_1)
> > + val = option->ltr_l1off_snooze_sspwrgate;
> > + } else {
> > + /* l1off, latency: 300us */
> > + if (aspm_L1_2)
> > + val = option->ltr_l1off_sspwrgate;
> > + }
> > +
> > + if (aspm_L1_1 || aspm_L1_2) {
> > + if (rtsx_check_dev_flag(pcr,
> > + LTR_L1SS_PWR_GATE_CHECK_CARD_EN)) {
> > + if (card_exist)
> > + val &= ~L1OFF_MBIAS2_EN_5250;
> > + else
> > + val |= L1OFF_MBIAS2_EN_5250;
> > + }
> > + }
> > + rtsx_set_l1off_sub(pcr, val);
> > +}
> > +
> > static const struct pcr_ops rts524a_pcr_ops = {
> > .write_phy = rts524a_write_phy,
> > .read_phy = rts524a_read_phy,
> > @@ -473,11 +617,16 @@ static int rts524a_extra_init_hw(struct rtsx_pcr *pcr)
> > .card_power_off = rtsx_base_card_power_off,
> > .switch_output_voltage = rtsx_base_switch_output_voltage,
> > .force_power_down = rtsx_base_force_power_down,
> > + .set_l1off_cfg_sub_d0 = rts5250_set_l1off_cfg_sub_d0,
> > + .set_aspm = rts5249_set_aspm,
> > };
> >
> > void rts524a_init_params(struct rtsx_pcr *pcr) {
> > rts5249_init_params(pcr);
> > + pcr->option.ltr_l1off_sspwrgate = LTR_L1OFF_SSPWRGATE_5250_DEFAULT;
> > + pcr->option.ltr_l1off_snooze_sspwrgate =
> > + LTR_L1OFF_SNOOZE_SSPWRGATE_5250_DEFAULT;
> >
> > pcr->reg_pm_ctrl3 = RTS524A_PM_CTRL3;
> > pcr->ops = &rts524a_pcr_ops;
> > @@ -576,11 +725,16 @@ static int rts525a_extra_init_hw(struct rtsx_pcr *pcr)
> > .card_power_off = rtsx_base_card_power_off,
> > .switch_output_voltage = rts525a_switch_output_voltage,
> > .force_power_down = rtsx_base_force_power_down,
> > + .set_l1off_cfg_sub_d0 = rts5250_set_l1off_cfg_sub_d0,
> > + .set_aspm = rts5249_set_aspm,
> > };
> >
> > void rts525a_init_params(struct rtsx_pcr *pcr) {
> > rts5249_init_params(pcr);
> > + pcr->option.ltr_l1off_sspwrgate = LTR_L1OFF_SSPWRGATE_5250_DEFAULT;
> > + pcr->option.ltr_l1off_snooze_sspwrgate =
> > + LTR_L1OFF_SNOOZE_SSPWRGATE_5250_DEFAULT;
> >
> > pcr->reg_pm_ctrl3 = RTS524A_PM_CTRL3;
> > pcr->ops = &rts525a_pcr_ops;
> > diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c index
> > a0ac89d..50a6e67 100644
> > --- a/drivers/mfd/rtsx_pcr.c
> > +++ b/drivers/mfd/rtsx_pcr.c
> > @@ -79,6 +79,131 @@ static inline void rtsx_pci_disable_aspm(struct rtsx_pcr *pcr)
> > 0xFC, 0);
> > }
> >
> > +int rtsx_comm_set_ltr_latency(struct rtsx_pcr *pcr, u32 latency) {
> > + rtsx_pci_write_register(pcr, MSGTXDATA0, 0xFF, (u8) (latency &
> > +0xFF));
>
> What is (the first) 0xFF?
>
> 0xFF is just 8 bit mask.
I mean the first one.
> > + rtsx_pci_write_register(pcr, MSGTXDATA1,
> > + 0xFF, (u8)((latency >> 8) & 0xFF));
> > + rtsx_pci_write_register(pcr, MSGTXDATA2,
> > + 0xFF, (u8)((latency >> 16) & 0xFF));
> > + rtsx_pci_write_register(pcr, MSGTXDATA3,
> > + 0xFF, (u8)((latency >> 24) & 0xFF));
> > + rtsx_pci_write_register(pcr, LTR_CTL, LTR_TX_EN_MASK |
> > + LTR_LATENCY_MODE_MASK, LTR_TX_EN_1 | LTR_LATENCY_MODE_SW);
> > +
> > + return 0;
> > +}
> > +
> > +int rtsx_set_ltr_latency(struct rtsx_pcr *pcr, u32 latency) {
> > + if (pcr->ops->set_ltr_latency)
> > + return pcr->ops->set_ltr_latency(pcr, latency);
> > + else
> > + return rtsx_comm_set_ltr_latency(pcr, latency); }
> > +
> > +static void rtsx_comm_set_aspm(struct rtsx_pcr *pcr, bool enable) {
> > + struct rtsx_cr_option *option = &pcr->option;
> > +
> > + if (pcr->aspm_enabled == enable)
> > + return;
> > +
> > + if (option->dev_aspm_mode == DEV_ASPM_DYNAMIC) {
> > + if (enable)
> > + rtsx_pci_enable_aspm(pcr);
> > + else
> > + rtsx_pci_disable_aspm(pcr);
> > + } else if (option->dev_aspm_mode == DEV_ASPM_BACKDOOR) {
> > + u8 mask = FORCE_ASPM_VAL_MASK;
> > + u8 val = 0;
> > +
> > + if (enable)
> > + val = pcr->aspm_en;
> > + rtsx_pci_write_register(pcr, ASPM_FORCE_CTL, mask, val);
> > + }
> > +
> > + pcr->aspm_enabled = enable;
> > +}
> > +
> > +static void rtsx_disable_aspm(struct rtsx_pcr *pcr) {
> > + if (pcr->ops->set_aspm)
> > + pcr->ops->set_aspm(pcr, false);
> > + else
> > + rtsx_comm_set_aspm(pcr, false);
> > +}
> > +
> > +int rtsx_set_l1off_sub(struct rtsx_pcr *pcr, u8 val) {
> > + rtsx_pci_write_register(pcr, L1SUB_CONFIG3, 0xFF, val);
> > +
> > + return 0;
> > +}
> > +
> > +static void rtsx_comm_set_l1off_cfg_sub_d0(struct rtsx_pcr *pcr, int
> > +active) {
> > + struct rtsx_cr_option *option = &(pcr->option);
> > +
> > + u32 interrupt = rtsx_pci_readl(pcr, RTSX_BIPR);
> > + int card_exist = (interrupt & SD_EXIST) | (interrupt & MS_EXIST);
> > + int aspm_L1_1, aspm_L1_2;
> > + u8 val = 0;
>
> No need to pre-initialise.
>
> Same above.
Same answer.
> > + aspm_L1_1 = rtsx_check_dev_flag(pcr, ASPM_L1_1_EN);
> > + aspm_L1_2 = rtsx_check_dev_flag(pcr, ASPM_L1_2_EN);
> > +
> > + if (active) {
> > + /* run, latency: 60us */
> > + if (aspm_L1_1)
> > + val = option->ltr_l1off_snooze_sspwrgate;
> > + } else {
> > + /* l1off, latency: 300us */
> > + if (aspm_L1_2)
> > + val = option->ltr_l1off_sspwrgate;
> > + }
> > +
> > + if (aspm_L1_1 || aspm_L1_2) {
> > + if (rtsx_check_dev_flag(pcr,
> > + LTR_L1SS_PWR_GATE_CHECK_CARD_EN)) {
> > + if (card_exist)
> > + val &= ~L1OFF_MBIAS2_EN_COMM;
> > + else
> > + val |= L1OFF_MBIAS2_EN_COMM;
> > + }
> > + }
> > + rtsx_set_l1off_sub(pcr, val);
> > +}
>
> This function looks very similar to the one above.
>
> Any way you can integrate the two?
>
> The two functions are callback functions in different files for different chips,
> in the future maybe need to support other chips, so I think separating them is low coupling.
Are they identical?
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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