[PATCH 07/17] bus: mvebu-mbus: suspend/resume support

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