Messages in this thread | | | Subject | Re: [PATCH v3] soc: mediatek: add a fixed wait for SRAM stable | From | Matthias Brugger <> | Date | Thu, 3 May 2018 09:12:31 +0200 |
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On 05/02/2018 06:03 AM, sean.wang@mediatek.com wrote: > From: Sean Wang <sean.wang@mediatek.com> > > MT7622_POWER_DOMAIN_WB doesn't send an ACK when its managed SRAM becomes > stable, which is not like the behavior the other power domains should > have. Therefore, it's necessary for such a power domain to have a fixed > and well-predefined duration to wait until its managed SRAM can be allowed > to access by all functions running on the top. > > v1 -> v2: > - use MTK_SCPD_FWAIT_SRAM flag as an indication requiring force waiting. > > v2 -> v3: > - change the order for condition judgment with we check an existence of > the MTK_SCPD_FWAIT_SRAM first to get rid of any oversight on negative > condition. > > Signed-off-by: Sean Wang <sean.wang@mediatek.com> > Cc: Matthias Brugger <matthias.bgg@gmail.com> > Cc: Ulf Hansson <ulf.hansson@linaro.org> > Cc: Weiyi Lu <weiyi.lu@mediatek.com> > ---
Now pused to v4.17-next/soc
Thanks a lot! Matthias
> drivers/soc/mediatek/mtk-scpsys.c | 23 +++++++++++++++++------ > 1 file changed, 17 insertions(+), 6 deletions(-) > > diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c > index b1b45e4..2080c8f 100644 > --- a/drivers/soc/mediatek/mtk-scpsys.c > +++ b/drivers/soc/mediatek/mtk-scpsys.c > @@ -32,6 +32,7 @@ > #define MTK_POLL_TIMEOUT (jiffies_to_usecs(HZ)) > > #define MTK_SCPD_ACTIVE_WAKEUP BIT(0) > +#define MTK_SCPD_FWAIT_SRAM BIT(1) > #define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x)) > > #define SPM_VDE_PWR_CON 0x0210 > @@ -237,11 +238,21 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) > val &= ~scpd->data->sram_pdn_bits; > writel(val, ctl_addr); > > - /* wait until SRAM_PDN_ACK all 0 */ > - ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0, > - MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); > - if (ret < 0) > - goto err_pwr_ack; > + /* Either wait until SRAM_PDN_ACK all 0 or have a force wait */ > + if (MTK_SCPD_CAPS(scpd, MTK_SCPD_FWAIT_SRAM)) { > + /* > + * Currently, MTK_SCPD_FWAIT_SRAM is necessary only for > + * MT7622_POWER_DOMAIN_WB and thus just a trivial setup is > + * applied here. > + */ > + usleep_range(12000, 12100); > + > + } else { > + ret = readl_poll_timeout(ctl_addr, tmp, (tmp & pdn_ack) == 0, > + MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); > + if (ret < 0) > + goto err_pwr_ack; > + }; > > if (scpd->data->bus_prot_mask) { > ret = mtk_infracfg_clear_bus_protection(scp->infracfg, > @@ -785,7 +796,7 @@ static const struct scp_domain_data scp_domain_data_mt7622[] = { > .sram_pdn_ack_bits = 0, > .clk_id = {CLK_NONE}, > .bus_prot_mask = MT7622_TOP_AXI_PROT_EN_WB, > - .caps = MTK_SCPD_ACTIVE_WAKEUP, > + .caps = MTK_SCPD_ACTIVE_WAKEUP | MTK_SCPD_FWAIT_SRAM, > }, > }; > >
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