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 4.10-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-4.10 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 @@ -1631,12 +1631,44 @@ 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, ¶m); Patches currently in stable-queue which might be from yc_chen@xxxxxxxxxxxxxx are queue-4.10/drm-ast-fix-ast2400-post-failure-without-bmc-fw-or-vbios.patch queue-4.10/drm-ast-call-open_key-before-enable_mmio-in-post-code.patch queue-4.10/drm-ast-fix-test-for-vga-enabled.patch