From: Philippe Mathieu-Daudé <philmd@linaro.org>
Date: Thu, 1 Aug 2024 13:27:24 +0000 (+0200)
Subject: hw/pci-host/gt64120: Reset config registers during RESET phase
X-Git-Tag: qemu-xen-4.20.0~30^2~2
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=ec70b7737f18de92e4c9aa31742ecfb680ed6005;p=qemu-xen.git

hw/pci-host/gt64120: Reset config registers during RESET phase

Reset config values in the device RESET phase, not only once
when the device is realized, because otherwise the device can
use unknown values at reset.

Since we are adding a new reset method, use the preferred
Resettable API (for a simple leaf device reset, a
DeviceClass::reset method and a ResettableClass::reset_hold
method are essentially identical).

Reported-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240802213122.86852-3-philmd@linaro.org>
---

diff --git a/hw/pci-host/gt64120.c b/hw/pci-host/gt64120.c
index 573d2619ee..33607dfbec 100644
--- a/hw/pci-host/gt64120.c
+++ b/hw/pci-host/gt64120.c
@@ -1217,17 +1217,24 @@ static void gt64120_pci_realize(PCIDevice *d, Error **errp)
 {
     /* Values from chapter 17.16 "PCI Configuration" */
 
-    pci_set_word(d->config + PCI_COMMAND, 0);
-    pci_set_word(d->config + PCI_STATUS,
-                 PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MEDIUM);
-    pci_config_set_prog_interface(d->config, 0);
-
     pci_set_long(d->wmask + PCI_BASE_ADDRESS_0, 0xfffff008); /* SCS[1:0] */
     pci_set_long(d->wmask + PCI_BASE_ADDRESS_1, 0xfffff008); /* SCS[3:2] */
     pci_set_long(d->wmask + PCI_BASE_ADDRESS_2, 0xfffff008); /* CS[2:0] */
     pci_set_long(d->wmask + PCI_BASE_ADDRESS_3, 0xfffff008); /* CS[3], BootCS */
     pci_set_long(d->wmask + PCI_BASE_ADDRESS_4, 0xfffff000); /* ISD MMIO */
     pci_set_long(d->wmask + PCI_BASE_ADDRESS_5, 0xfffff001); /* ISD I/O */
+}
+
+static void gt64120_pci_reset_hold(Object *obj, ResetType type)
+{
+    PCIDevice *d = PCI_DEVICE(obj);
+
+    /* Values from chapter 17.16 "PCI Configuration" */
+
+    pci_set_word(d->config + PCI_COMMAND, 0);
+    pci_set_word(d->config + PCI_STATUS,
+                 PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MEDIUM);
+    pci_config_set_prog_interface(d->config, 0);
 
     pci_set_long(d->config + PCI_BASE_ADDRESS_0, 0x00000008);
     pci_set_long(d->config + PCI_BASE_ADDRESS_1, 0x01000008);
@@ -1243,7 +1250,9 @@ static void gt64120_pci_class_init(ObjectClass *klass, void *data)
 {
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
 
+    rc->phases.hold = gt64120_pci_reset_hold;
     k->realize = gt64120_pci_realize;
     k->vendor_id = PCI_VENDOR_ID_MARVELL;
     k->device_id = PCI_DEVICE_ID_MARVELL_GT6412X;