MIPS: Lantiq: Fix setting the PCI bus speed on AR9

The bits used to set the PCI bus speed on AR9 are slightly different to
those used on Danube.

Signed-off-by: John Crispin <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/2614/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/pci/pci-lantiq.c

···
 	u32 temp_buffer;
 
 	/* set clock to 33Mhz */
-	ltq_cgu_w32(ltq_cgu_r32(LTQ_CGU_IFCCR) & ~0xf00000, LTQ_CGU_IFCCR);
-	ltq_cgu_w32(ltq_cgu_r32(LTQ_CGU_IFCCR) | 0x800000, LTQ_CGU_IFCCR);
+	if (ltq_is_ar9()) {
+		ltq_cgu_w32(ltq_cgu_r32(LTQ_CGU_IFCCR) & ~0x1f00000, LTQ_CGU_IFCCR);
+		ltq_cgu_w32(ltq_cgu_r32(LTQ_CGU_IFCCR) | 0xe00000, LTQ_CGU_IFCCR);
+	} else {
+		ltq_cgu_w32(ltq_cgu_r32(LTQ_CGU_IFCCR) & ~0xf00000, LTQ_CGU_IFCCR);
+		ltq_cgu_w32(ltq_cgu_r32(LTQ_CGU_IFCCR) | 0x800000, LTQ_CGU_IFCCR);
+	}
 
 	/* external or internal clock ? */
 	if (conf->clock) {