Restore SeaBIOS 9029a010 update, but with AHCI fix

I fixed the AHCI bug, with a patch that I wrote. It works by
restoring the old SeaBIOS AHCI initialisation behaviour, whereby
the AHCI controller is enabled from its current state; the patch
that broke AHCI in coreboot (tested on ThinkPad T420), changed
AHCI initialisation behaviour so that the controller's state is
first reset, prior to enablement.

However, my patch also retains the new AHCI initialisation
behaviour, when a CSM is in use. The AHCI reset patch was done,
by the author, specifically for SeaBIOS in CSM mode, so it makes
sense to only change the behaviour conditionally according to that.

This reverts commit 8245f0b3211812ac818adadd6526b0b39c63f3f0.

Signed-off-by: Leah Rowe <leah@libreboot.org>

5 files changed, 76 insertions, 13 deletions

diff --git a/config/seabios/default/patches/0001-romfile-implement-a-generic-loader.patch b/config/seabios/default/patches/0001-romfile-implement-a-generic-loader.patch
index 2c042776..dc1464bb 100644
--- a/config/seabios/default/patches/0001-romfile-implement-a-generic-loader.patch
+++ b/config/seabios/default/patches/0001-romfile-implement-a-generic-loader.patch
@@ -1,7 +1,7 @@
-From 2aff8adc1dcd1315877fdb4ac4ef5e649c5b7d11 Mon Sep 17 00:00:00 2001
+From 04e972e14191f3a480e569e972c195ba8eb53a30 Mon Sep 17 00:00:00 2001
 From: Riku Viitanen <riku.viitanen@protonmail.com>
 Date: Sat, 10 Feb 2024 21:23:33 +0200
-Subject: [PATCH 1/2] romfile: implement a generic loader
+Subject: [PATCH 1/4] romfile: implement a generic loader
 
 romfile_loadfile_g:
 Based on romfile_loadfile but more flexible. User has to supply pointer
@@ -18,7 +18,7 @@ Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>
  2 files changed, 22 insertions(+), 5 deletions(-)
 
 diff --git a/src/romfile.c b/src/romfile.c
-index b598274edc09..8ccf5139ece8 100644
+index 8072a915..f4d5f82d 100644
 --- a/src/romfile.c
 +++ b/src/romfile.c
 @@ -47,10 +47,12 @@ romfile_find(const char *name)
@@ -69,7 +69,7 @@ index b598274edc09..8ccf5139ece8 100644
  }
  
 diff --git a/src/romfile.h b/src/romfile.h
-index 3e0f820047dd..1b967d86551f 100644
+index ae2f4ac7..f62b2fee 100644
 --- a/src/romfile.h
 +++ b/src/romfile.h
 @@ -13,6 +13,8 @@ struct romfile_s {
@@ -80,7 +80,7 @@ index 3e0f820047dd..1b967d86551f 100644
 +                         void *(*malloc_fn)(u32), int add_len);
  void *romfile_loadfile(const char *name, int *psize);
  u64 romfile_loadint(const char *name, u64 defval);
- 
+ u32 romfile_loadbool(const char *name, u32 defval);
 -- 
-2.43.0
+2.39.5
 
diff --git a/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch b/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch
index f05a34c2..5224d768 100644
--- a/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch
+++ b/config/seabios/default/patches/0002-vgahooks-optionroms-implement-mxm-3.0-interrupts.patch
@@ -1,7 +1,7 @@
-From 1e7c443d069ef817c4e699bd6675efff4ebddb86 Mon Sep 17 00:00:00 2001
+From 270ac30b862c58c69455dbdace716044d29b20e2 Mon Sep 17 00:00:00 2001
 From: Riku Viitanen <riku.viitanen@protonmail.com>
 Date: Sat, 10 Feb 2024 21:38:17 +0200
-Subject: [PATCH 2/2] vgahooks, optionroms: implement mxm 3.0 interrupts
+Subject: [PATCH 2/4] vgahooks, optionroms: implement mxm 3.0 interrupts
 
 VGAROMs on MXM graphics cards need certain int15h functions present.
 
@@ -184,5 +184,5 @@ index 00000000..f0c203af
 +
 +#endif // vgahooks.h
 -- 
-2.43.0
+2.39.5
 
diff --git a/config/seabios/default/patches/0003-Print-the-Libreboot-version-in-the-SeaBIOS-menu.patch b/config/seabios/default/patches/0003-Print-the-Libreboot-version-in-the-SeaBIOS-menu.patch
index bff93e9d..acde7f20 100644
--- a/config/seabios/default/patches/0003-Print-the-Libreboot-version-in-the-SeaBIOS-menu.patch
+++ b/config/seabios/default/patches/0003-Print-the-Libreboot-version-in-the-SeaBIOS-menu.patch
@@ -1,7 +1,7 @@
-From ebd8293eb1af20c204beb3aa1394865185e2f3f0 Mon Sep 17 00:00:00 2001
+From cc6b13ddea9086586d34621d0b82d820af5ae785 Mon Sep 17 00:00:00 2001
 From: Leah Rowe <leah@libreboot.org>
 Date: Mon, 6 Jan 2025 18:49:58 +0000
-Subject: [PATCH 1/1] Print the Libreboot version in the SeaBIOS menu
+Subject: [PATCH 3/4] Print the Libreboot version in the SeaBIOS menu
 
 Signed-off-by: Leah Rowe <leah@libreboot.org>
 ---
@@ -9,7 +9,7 @@ Signed-off-by: Leah Rowe <leah@libreboot.org>
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/src/bootsplash.c b/src/bootsplash.c
-index 538b316d..8746098c 100644
+index 538b316d..9eed0b12 100644
 --- a/src/bootsplash.c
 +++ b/src/bootsplash.c
 @@ -48,7 +48,7 @@ enable_vga_console(void)
diff --git a/config/seabios/default/patches/0004-ahci-Only-reset-controller-on-CSM.patch b/config/seabios/default/patches/0004-ahci-Only-reset-controller-on-CSM.patch
new file mode 100644
index 00000000..43f2b8a9
--- /dev/null
+++ b/config/seabios/default/patches/0004-ahci-Only-reset-controller-on-CSM.patch
@@ -0,0 +1,63 @@
+From 5fe2215bc5196d836b54e1e5fb00b63fa096fda7 Mon Sep 17 00:00:00 2001
+From: Leah Rowe <leah@libreboot.org>
+Date: Thu, 1 May 2025 15:46:54 +0100
+Subject: [PATCH 4/4] ahci: Only reset controller on CSM
+
+Please refer to this commit:
+
+commit 8863cbbd15a73b03153553c562f5b1fb939ad4d7
+Author: Gerd Hoffmann <kraxel@redhat.com>
+Date:   Thu Feb 6 12:10:21 2025 +0100
+
+    ahci: add controller reset
+
+This commit broke AHCI init on the Lenovo ThinkPad T420,
+when tested with SeaBIOS as a coreboot payload.
+
+Since the above commit was made with CSMs in mind, to make
+the AHCI driver work there, that change has been re-worked
+so as to only apply when a CSM is in use.
+
+Signed-off-by: Leah Rowe <leah@libreboot.org>
+---
+ src/hw/ahci.c | 17 ++++++++++++++---
+ 1 file changed, 14 insertions(+), 3 deletions(-)
+
+diff --git a/src/hw/ahci.c b/src/hw/ahci.c
+index 2285d33d..b09b198a 100644
+--- a/src/hw/ahci.c
++++ b/src/hw/ahci.c
+@@ -637,7 +637,7 @@ static void
+ ahci_controller_setup(struct pci_device *pci)
+ {
+     struct ahci_port_s *port;
+-    u32 pnr, max;
++    u32 val, pnr, max;
+ 
+     if (create_bounce_buf() < 0)
+         return;
+@@ -660,8 +660,19 @@ ahci_controller_setup(struct pci_device *pci)
+ 
+     pci_enable_busmaster(pci);
+ 
+-    ahci_ctrl_writel(ctrl, HOST_CTL, HOST_CTL_RESET);
+-    ahci_ctrl_writel(ctrl, HOST_CTL, HOST_CTL_AHCI_EN);
++    /* AHCI controller reset, but only for CSM. Commit 8863cbbd
++       introduced this universally, to make AHCI drivers work in
++       CSM mode, but it broke AHCI setup on the ThinkPad T420 when
++       SeaBIOS is used as a coreboot payload, hence the else clause: */
++    if (CONFIG_CSM) {
++        /* Enable AHCI controller after resetting its state */
++        ahci_ctrl_writel(ctrl, HOST_CTL, HOST_CTL_RESET);
++        ahci_ctrl_writel(ctrl, HOST_CTL, HOST_CTL_AHCI_EN);
++    } else {
++        /* Enable AHCI controller from its current state */
++        val = ahci_ctrl_readl(ctrl, HOST_CTL);
++        ahci_ctrl_writel(ctrl, HOST_CTL, val | HOST_CTL_AHCI_EN);
++    }
+ 
+     ctrl->caps = ahci_ctrl_readl(ctrl, HOST_CAP);
+     ctrl->ports = ahci_ctrl_readl(ctrl, HOST_PORTS_IMPL);
+-- 
+2.39.5
+
diff --git a/config/seabios/default/target.cfg b/config/seabios/default/target.cfg
index 9ff1db3e..92b906f2 100644
--- a/config/seabios/default/target.cfg
+++ b/config/seabios/default/target.cfg
@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 tree="default"
-rev="1602647f1be24fe63d11138d802e735c8e674e63"
+rev="9029a010ec413e6c3c0eb52c29c252a5b9a9f774"