From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B99D3C282DD for ; Thu, 23 May 2019 19:50:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 933A720881 for ; Thu, 23 May 2019 19:50:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558641026; bh=SurAlSJuIgXS5zvEQC7YB5+ieM+xlVu36sEG7hdHYBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gU85g7QV9DrnkR1v40F11XhvjAkFZHa6y4dXzHgXa9/og9TvYgYX/GbIz8mt5wmqV Az2xEMCuqGzADkUrDHZedLVv1ScyqkxdFWGkeb/R23R85JYDtAzLJCwOqriANKxAYj 3yWn2J0iaeBTu5jfBd8E70yrojzn3v94gx/m+rQk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387761AbfEWTuV (ORCPT ); Thu, 23 May 2019 15:50:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:43222 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387615AbfEWTJ5 (ORCPT ); Thu, 23 May 2019 15:09:57 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0D4922187F; Thu, 23 May 2019 19:09:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558638597; bh=SurAlSJuIgXS5zvEQC7YB5+ieM+xlVu36sEG7hdHYBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fyO9cCSyjpoyYpvrnb+qnIWfU6mZK4r7RAIyYbdUWVqPQ7u3wmvZKFqXmkw3bWCd8 SdjM7xmu8LBtZBhsxJd1agLK3PnO4DyhGQFw0B3Q4RhQFbrS9QYWLM29cGr8gD/Cye cZWinj42GWre4NR0j8W5BOMtfpoMW6z9UQ2AORWc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yifeng Li , Sudip Mukherjee , Teddy Wang , Bartlomiej Zolnierkiewicz Subject: [PATCH 4.9 31/53] fbdev: sm712fb: fix VRAM detection, dont set SR70/71/74/75 Date: Thu, 23 May 2019 21:05:55 +0200 Message-Id: <20190523181715.787822144@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181710.981455400@linuxfoundation.org> References: <20190523181710.981455400@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yifeng Li commit dcf9070595e100942c539e229dde4770aaeaa4e9 upstream. On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), the amount of Video RAM is not detected correctly by the xf86-video-siliconmotion driver. This is because sm712fb overwrites the GPR71 Scratch Pad Register, which is set by BIOS on x86 and used to indicate amount of VRAM. Other Scratch Pad Registers, including GPR70/74/75, don't have the same side-effect, but overwriting to them is still questionable, as they are not related to modesetting. Stop writing to SR70/71/74/75 (a.k.a GPR70/71/74/75). Signed-off-by: Yifeng Li Tested-by: Sudip Mukherjee Cc: Teddy Wang Cc: # v4.4+ Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Greg Kroah-Hartman --- drivers/video/fbdev/sm712fb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/video/fbdev/sm712fb.c +++ b/drivers/video/fbdev/sm712fb.c @@ -1145,7 +1145,9 @@ static void sm7xx_set_timing(struct smtc /* init SEQ register SR30 - SR75 */ for (i = 0; i < SIZE_SR30_SR75; i++) if ((i + 0x30) != 0x30 && (i + 0x30) != 0x62 && - (i + 0x30) != 0x6a && (i + 0x30) != 0x6b) + (i + 0x30) != 0x6a && (i + 0x30) != 0x6b && + (i + 0x30) != 0x70 && (i + 0x30) != 0x71 && + (i + 0x30) != 0x74 && (i + 0x30) != 0x75) smtc_seqw(i + 0x30, vgamode[j].init_sr30_sr75[i]);