linux-kernel - [PATCH 4.9 44/63] drm/ast: Call open_key before enable

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Message-Id: <20170313083417.229128787@linuxfoundation.org>
Date:   Mon, 13 Mar 2017 16:39:31 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Y.C. Chen" <yc_chen@...eedtech.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>, Dave Airlie <airlied@...hat.com>
Subject: [PATCH 4.9 44/63] drm/ast: Call open_key before enable_mmio in POST code

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Y.C. Chen <yc_chen@...eedtech.com>

commit 9bb92f51558f2ef5f56c257bdcea0588f31d857e upstream.

open_key enables access the registers used by enable_mmio

Signed-off-by: Y.C. Chen <yc_chen@...eedtech.com>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Acked-by: Joel Stanley <joel@....id.au>
Tested-by: Y.C. Chen <yc_chen@...eedtech.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/ast/ast_post.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -371,8 +371,8 @@ void ast_post_gpu(struct drm_device *dev
 	pci_write_config_dword(ast->dev->pdev, 0x04, reg);
 
 	ast_enable_vga(dev);
-	ast_enable_mmio(dev);
 	ast_open_key(ast);
+	ast_enable_mmio(dev);
 	ast_set_def_ext_reg(dev);
 
 	if (ast->chip == AST2300 || ast->chip == AST2400)