arm: a37xx: pci: Fix pcie_advk_link_up()

Aardvark reports Disabled and Hot Reset LTSSM states as values >= 0x20.
Link is not up in these states, so fix pcie_advk_link_up() function.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>

drivers/pci/pci-aardvark.c

@@ -145,6 +145,7 @@
 #define     LTSSM_SHIFT				24
 #define     LTSSM_MASK				0x3f
 #define     LTSSM_L0				0x10
+#define     LTSSM_DISABLED			0x20
 #define VENDOR_ID_REG				(LMI_BASE_ADDR + 0x44)
 
 /* PCIe core controller registers */
@@ -569,7 +570,7 @@ static int pcie_advk_link_up(struct pcie_advk *pcie)
 
 	val = advk_readl(pcie, CFG_REG);
 	ltssm_state = (val >> LTSSM_SHIFT) & LTSSM_MASK;
-	return ltssm_state >= LTSSM_L0;
+	return ltssm_state >= LTSSM_L0 && ltssm_state < LTSSM_DISABLED;
 }
 
 /**