Patch "drm/ast: Fix AST2400 POST failure without BMC FW or VBIOS" has been added to the 4.4-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/ast: Fix AST2400 POST failure without BMC FW or VBIOS

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-ast-fix-ast2400-post-failure-without-bmc-fw-or-vbios.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 3856081eede297b617560b85e948cfb00bb395ec Mon Sep 17 00:00:00 2001
From: "Y.C. Chen" <yc_chen@xxxxxxxxxxxxxx>
Date: Thu, 23 Feb 2017 15:52:33 +0800
Subject: drm/ast: Fix AST2400 POST failure without BMC FW or VBIOS

From: Y.C. Chen <yc_chen@xxxxxxxxxxxxxx>

commit 3856081eede297b617560b85e948cfb00bb395ec upstream.

The current POST code for the AST2300/2400 family doesn't work properly
if the chip hasn't been initialized previously by either the BMC own FW
or the VBIOS. This fixes it.

Signed-off-by: Y.C. Chen <yc_chen@xxxxxxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Tested-by: Y.C. Chen <yc_chen@xxxxxxxxxxxxxx>
Acked-by: Joel Stanley <joel@xxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/ast/ast_post.c |   38 +++++++++++++++++++++++++++++++++++---
 1 file changed, 35 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -1626,12 +1626,44 @@ static void ast_init_dram_2300(struct dr
 		temp |= 0x73;
 		ast_write32(ast, 0x12008, temp);
 
+		param.dram_freq = 396;
 		param.dram_type = AST_DDR3;
+		temp = ast_mindwm(ast, 0x1e6e2070);
 		if (temp & 0x01000000)
 			param.dram_type = AST_DDR2;
-		param.dram_chipid = ast->dram_type;
-		param.dram_freq = ast->mclk;
-		param.vram_size = ast->vram_size;
+                switch (temp & 0x18000000) {
+		case 0:
+			param.dram_chipid = AST_DRAM_512Mx16;
+			break;
+		default:
+		case 0x08000000:
+			param.dram_chipid = AST_DRAM_1Gx16;
+			break;
+		case 0x10000000:
+			param.dram_chipid = AST_DRAM_2Gx16;
+			break;
+		case 0x18000000:
+			param.dram_chipid = AST_DRAM_4Gx16;
+			break;
+		}
+                switch (temp & 0x0c) {
+                default:
+		case 0x00:
+			param.vram_size = AST_VIDMEM_SIZE_8M;
+			break;
+
+		case 0x04:
+			param.vram_size = AST_VIDMEM_SIZE_16M;
+			break;
+
+		case 0x08:
+			param.vram_size = AST_VIDMEM_SIZE_32M;
+			break;
+
+		case 0x0c:
+			param.vram_size = AST_VIDMEM_SIZE_64M;
+			break;
+		}
 
 		if (param.dram_type == AST_DDR3) {
 			get_ddr3_info(ast, &param);


Patches currently in stable-queue which might be from yc_chen@xxxxxxxxxxxxxx are

queue-4.4/drm-ast-fix-ast2400-post-failure-without-bmc-fw-or-vbios.patch
queue-4.4/drm-ast-call-open_key-before-enable_mmio-in-post-code.patch
queue-4.4/drm-ast-fix-test-for-vga-enabled.patch