From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753166AbdCMJJ6 (ORCPT ); Mon, 13 Mar 2017 05:09:58 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:40008 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752337AbdCMInO (ORCPT ); Mon, 13 Mar 2017 04:43:14 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Y.C. Chen" , Benjamin Herrenschmidt , Joel Stanley , Dave Airlie Subject: [PATCH 4.9 43/63] drm/ast: Fix test for VGA enabled Date: Mon, 13 Mar 2017 16:39:30 +0800 Message-Id: <20170313083417.178126846@linuxfoundation.org> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20170313083414.786638815@linuxfoundation.org> References: <20170313083414.786638815@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Y.C. Chen commit 905f21a49d388de3e99438235f3301cabf0c0ef4 upstream. The test to see if VGA was already enabled is doing an unnecessary second test from a register that may or may not have been initialized to a valid value. Remove it. Signed-off-by: Y.C. Chen Signed-off-by: Benjamin Herrenschmidt Acked-by: Joel Stanley Tested-by: Y.C. Chen Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/ast/ast_post.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) --- a/drivers/gpu/drm/ast/ast_post.c +++ b/drivers/gpu/drm/ast/ast_post.c @@ -58,13 +58,9 @@ bool ast_is_vga_enabled(struct drm_devic /* TODO 1180 */ } else { ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT); - if (ch) { - ast_open_key(ast); - ch = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff); - return ch & 0x04; - } + return !!(ch & 0x01); } - return 0; + return false; } static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };