Hi Thomas,
[...]
> struct mvebu_mbus_state {
> void __iomem *mbuswins_base;
> void __iomem *sdramwins_base;
> + void __iomem *mbusbridge_base;
Here you store the information about the availability of the register needed
for suspend/resume ...
[...]
> +static int mvebu_mbus_suspend(void)
> +{
> + struct mvebu_mbus_state *s = &mbus_state;
> + int win;
> +
> + for (win = 0; win < s->soc->num_wins; win++) {
> + void __iomem *addr = s->mbuswins_base +
> + s->soc->win_cfg_offset(win);
> +
> + s->wins[win].base = readl(addr + WIN_BASE_OFF);
> + s->wins[win].ctrl = readl(addr + WIN_CTRL_OFF);
> +
> + if (win >= s->soc->num_remappable_wins)
> + continue;
> +
> + s->wins[win].remap_lo = readl(addr + WIN_REMAP_LO_OFF);
> + s->wins[win].remap_hi = readl(addr + WIN_REMAP_HI_OFF);
> + }
> +
> + if (s->mbusbridge_base) {
> + s->mbus_bridge_ctrl = readl(s->mbusbridge_base +
> + MBUS_BRIDGE_CTRL_OFF);
> + s->mbus_bridge_base = readl(s->mbusbridge_base +
> + MBUS_BRIDGE_BASE_OFF);
> + }
... so here could you exit with an error if the register is not available.
Then it would prevent to enter in suspend instead of crashing the system.
Thanks,
Gregory
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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