commit 71e7e1af002c9715c5e08100aedbd3ff5ee9777d
author Andrew Scull <ascull@google.com> Thu Apr 21 16:11:16 2022 +0000
committer Tom Rini <trini@konsulko.com> Tue May 03 18:33:29 2022 -0400
tree 8c0241b1adb7345fe8df34da06ff1dac83f74e4f
parent a625bbd11e4b31741b90340f0d17f333c1e2002c

pci: Add config for Enhanced Allocation

Add a config to control whether Enhanced Allocation is supported by the
driver.

Signed-off-by: Andrew Scull <ascull@google.com>

drivers/pci/Kconfig

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 47cd074..fd22034 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -67,6 +67,13 @@
 	  if available on a PCI Physical Function device and probe for
 	  applicable drivers.
 
+config PCI_ENHANCED_ALLOCATION
+	bool "Enable support for Enhanced Allocation of resources"
+	default y
+	help
+	  Enable support for Enhanced Allocation which can be used by supported
+	  devices in place of traditional BARS for allocation of resources.
+
 config PCI_ARID
         bool "Enable Alternate Routing-ID support for PCI"
         help

drivers/pci/pci-uclass.c

diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index bb53e6b..970ee1a 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -645,7 +645,11 @@
 		return log_msg_ret("probe", -EINVAL);
 	}
 
-	ea_pos = dm_pci_find_capability(bus, PCI_CAP_ID_EA);
+	if (IS_ENABLED(CONFIG_PCI_ENHANCED_ALLOCATION))
+		ea_pos = dm_pci_find_capability(bus, PCI_CAP_ID_EA);
+	else
+		ea_pos = 0;
+
 	if (ea_pos) {
 		dm_pci_read_config8(bus, ea_pos + sizeof(u32) + sizeof(u8),
 				    &reg);
@@ -1579,7 +1583,11 @@
 	 * Incase of virtual functions, pdata will help read VF BEI
 	 * and EA entry size.
 	 */
-	ea_off = dm_pci_find_capability(udev, PCI_CAP_ID_EA);
+	if (IS_ENABLED(CONFIG_PCI_ENHANCED_ALLOCATION))
+		ea_off = dm_pci_find_capability(udev, PCI_CAP_ID_EA);
+	else
+		ea_off = 0;
+
 	if (ea_off)
 		return dm_pci_map_ea_bar(udev, bar, offset, len, ea_off, pdata);