grub2/0051-grub-core-disk-ahci.c-Do-not-enable-I-O-decoding-and.patch

From 5795341bb64a4e101d7c067d688b19a41dd50662 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Wed, 29 Jan 2014 23:43:25 +0100
Subject: [PATCH 051/140] 	* grub-core/disk/ahci.c: Do not enable I/O
 decoding and keep 	enabling busmaster for the end.

---
 ChangeLog             |  5 +++++
 grub-core/disk/ahci.c | 10 ++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 9837c7f..51eba95 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2014-01-29  Vladimir Serbinenko  <phcoder@gmail.com>
 
+	* grub-core/disk/ahci.c: Do not enable I/O decoding and keep
+	enabling busmaster for the end.
+
+2014-01-29  Vladimir Serbinenko  <phcoder@gmail.com>
+
 	* util/grub-mkfont.c: Downgrade warnings about unhandled features
 	to debug.
 
diff --git a/grub-core/disk/ahci.c b/grub-core/disk/ahci.c
index 0b13fb8..18c1327 100644
--- a/grub-core/disk/ahci.c
+++ b/grub-core/disk/ahci.c
@@ -194,10 +194,8 @@ grub_ahci_pciinit (grub_pci_device_t dev,
     return 0;
 
   addr = grub_pci_make_address (dev, GRUB_PCI_REG_COMMAND);
-  grub_pci_write_word (addr, grub_pci_read_word (addr) | 
-		    GRUB_PCI_COMMAND_IO_ENABLED
-		    | GRUB_PCI_COMMAND_MEM_ENABLED
-		    | GRUB_PCI_COMMAND_BUS_MASTER);
+  grub_pci_write_word (addr, grub_pci_read_word (addr)
+		    | GRUB_PCI_COMMAND_MEM_ENABLED);
 
   hba = grub_pci_device_map_range (dev, bar & GRUB_PCI_ADDR_MEM_MASK,
 				   sizeof (hba));
@@ -621,6 +619,10 @@ grub_ahci_pciinit (grub_pci_device_t dev,
     if (adevs[i] && (adevs[i]->hba->ports[adevs[i]->port].sig >> 16) == 0xeb14)
       adevs[i]->atapi = 1;
 
+  addr = grub_pci_make_address (dev, GRUB_PCI_REG_COMMAND);
+  grub_pci_write_word (addr, grub_pci_read_word (addr)
+		    | GRUB_PCI_COMMAND_BUS_MASTER);
+
   for (i = 0; i < nports; i++)
     if (adevs[i])
       {
-- 
1.9.3