fix sata slots on dell 9020 sff and mt

3rd sata slot (of 3) broken on 9020 sff, and the 3rd and 4th (of 4)
slots are broken on 9020 mt

this patch fixes them on both, so that all ports work properly

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

1 files changed, 66 insertions, 0 deletions

diff --git a/config/coreboot/default/patches/0039-fix-sata-ports-on-dell-9020-sff-and-mt.patch b/config/coreboot/default/patches/0039-fix-sata-ports-on-dell-9020-sff-and-mt.patch
new file mode 100644
index 00000000..f4c3939c
--- /dev/null
+++ b/config/coreboot/default/patches/0039-fix-sata-ports-on-dell-9020-sff-and-mt.patch
@@ -0,0 +1,66 @@
+From 4889f08306f1530211dcc6f6a4e999c6cc72f3ac Mon Sep 17 00:00:00 2001
+From: Leah Rowe <info@minifree.org>
+Date: Sat, 30 Mar 2024 05:57:54 +0000
+Subject: [PATCH 1/1] fix sata ports on dell 9020 sff and mt
+
+mate kukri has a patch under review on coreboot that sets
+sata port map to 0x7 on sff and 0xf on mt.
+
+see: intel 8 series pch datasheet, section 13.1.35
+
+basically, the 6 least significant bits enable the sata
+slots; 1 for enable and 0 for disable. there can be up
+to 6 ports. least significant bit is port 0, then next
+is port 1, and so on.
+
+coreboot currently enables ports 0, 1, 4 and 5, making this
+value 0x33 (converted to binary: 00110011). sff has ports
+0, 1 and 2 wired, so mate changed that to 0x7 (00000111).
+
+on mt, the blue ports are ports 0 and 1, but the two white
+ports don't work, but coreboot enables 4 and 5; it is
+likely that the blue ports are in fact 0 and 1, and the
+white ports are 2 and 3, but we've not tested this!
+
+it could be that the blue ports are ports 4 and 5, and
+the white ports are 2 and 3! we have not yet determined
+this, but mate set it to 0xf, meaning ports 0 1 2 and 3
+are enabled, in his patch under review. the chance that
+it's 2, 3, 4 and 5 on the board is unlikely, but it is
+theoretically possible and has not been confirmed.
+
+therefore, for now, i will set the value to 0x3f, which
+in binary is 00111111, thus enabling all 6 slots. the two
+that aren't physically wired don't really matter. enabling
+ports (from the pch) that electrically aren't there and
+then powering on is electrically equivalent to those ports
+being actually being wired, but with no devices plugged
+into them. therefore, 0x3f is an effective shotgun fix.
+
+i'll remove this patch and use mate's fix when the latter
+has been tested on MT; it has already been tested on SFF.
+
+this patch fixes the 3rd sata slot on 9020 sff, and the 3rd
+and 4th sata slots on 9020 MT
+
+Signed-off-by: Leah Rowe <info@minifree.org>
+---
+ src/mainboard/dell/optiplex_9020/devicetree.cb | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/mainboard/dell/optiplex_9020/devicetree.cb b/src/mainboard/dell/optiplex_9020/devicetree.cb
+index c0b17a15ff..7bfa6736a6 100644
+--- a/src/mainboard/dell/optiplex_9020/devicetree.cb
++++ b/src/mainboard/dell/optiplex_9020/devicetree.cb
+@@ -23,7 +23,7 @@ chip northbridge/intel/haswell
+ 			register "gen2_dec" = "0x007c0901"
+ 			register "gen3_dec" = "0x003c07e1"
+ 			register "gen4_dec" = "0x001c0901"
+-			register "sata_port_map" = "0x33"
++			register "sata_port_map" = "0x3f"
+ 
+ 			device pci 14.0 on  end				# xHCI controller
+ 			device pci 16.0 on  end				# Management Engine interface 1
+-- 
+2.39.2
+