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SubjectRe: [PATCH 2/4] soc: Mediatek: Add SCPSYS power domain driver
On Fri, May 08, 2015 at 02:28:37PM +0200, Matthias Brugger wrote:
> 2015-05-08 14:19 GMT+02:00 Sascha Hauer <s.hauer@pengutronix.de>:
> > On Fri, May 08, 2015 at 02:16:06PM +0200, Matthias Brugger wrote:
> >> 2015-03-10 16:41 GMT+01:00 Sascha Hauer <s.hauer@pengutronix.de>:
> >> > +static int scpsys_power_on(struct generic_pm_domain *genpd)
> >> > +{
> >> > + struct scp_domain *scpd = container_of(genpd, struct scp_domain, pmd);
> >> > + struct scp *scp = scpd->scp;
> >> > + struct scp_domain_data *data = scpd->data;
> >> > + unsigned long expired;
> >> > + void __iomem *ctl_addr = scpd->scp->base + data->ctl_offs;
> >> > + u32 sram_pdn_ack = data->sram_pdn_ack_bits;
> >> > + u32 val;
> >> > + int ret;
> >> > +
> >> > + val = readl(ctl_addr);
> >> > + val |= PWR_ON_BIT;
> >> > + writel(val, ctl_addr);
> >> > + val |= PWR_ON_2ND_BIT;
> >> > + writel(val, ctl_addr);
> >> > +
> >> > + /* wait until PWR_ACK = 1 */
> >> > + expired = jiffies + HZ;
> >> > + while (!(readl(scp->base + SPM_PWR_STATUS) & data->sta_mask) ||
> >> > + !(readl(scp->base + SPM_PWR_STATUS_2ND) & data->sta_mask)) {
> >> > + cpu_relax();
> >> > + if (time_after(jiffies, expired)) {
> >> > + ret = -EIO;
> >> > + goto out;
> >> > + }
> >> > + }
> >> > +
> >> > + val &= ~PWR_CLK_DIS_BIT;
> >> > + writel(val, ctl_addr);
> >> > +
> >> > + val &= ~PWR_ISO_BIT;
> >> > + writel(val, ctl_addr);
> >> > +
> >> > + val |= PWR_RST_B_BIT;
> >> > + writel(val, ctl_addr);
> >> > +
> >> > + val &= ~data->sram_pdn_bits;
> >> > + writel(val, ctl_addr);
> >> > +
> >> > + /* wait until SRAM_PDN_ACK all 0 */
> >> > + expired = jiffies + HZ;
> >> > + while (sram_pdn_ack && (readl(ctl_addr) & sram_pdn_ack)) {
> >>
> >> I think "sram_pdn_ack &&" was added accidently here. It is always
> >> bigger then zero.
> >
> > Nope, it's zero for MT8173_POWER_DOMAIN_MFG_ASYNC.
>
> In probe you turn on all power domains defined in scp_domain_data[].
> So all but MT8173_POWER_DOMAIN_MFG_ASYNC will fail.
> Does this make sense?

What makes you think that enabling the domains will fail? That doesn't
happen.

Sascha

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