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,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 334B9C28EBD for ; Sun, 9 Jun 2019 17:13:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE0072067C for ; Sun, 9 Jun 2019 17:13:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560100422; bh=SurAlSJuIgXS5zvEQC7YB5+ieM+xlVu36sEG7hdHYBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=O9YPmRodJ7+lCLN2f8NmJpQd8MrAPIbA4wNY5XrPehsI8lHVmWkK0iqpFxq1CSmzO +L/xxD5d4yolGlQdI7T5SDTf2A/odTs543sHPxkRAsabwdlC4SwrW6jhfbnllARJBd 1RZVatOSY4zDoH4eBKUUU7ERu+egB7vxi6fgCtrg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733280AbfFIQ57 (ORCPT ); Sun, 9 Jun 2019 12:57:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:32954 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733277AbfFIQ56 (ORCPT ); Sun, 9 Jun 2019 12:57:58 -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 95AC520840; Sun, 9 Jun 2019 16:57:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099478; bh=SurAlSJuIgXS5zvEQC7YB5+ieM+xlVu36sEG7hdHYBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BDofnE4y0/Uz2KnPiDPejZUkN6XQf74ejHYVFDMvfdcFNwOkgnNjmxlutTLZ/LkZT 9IIHKUr07iQJrIqDC1nFkBTIQnEBM2VoJjXFaMPR7HxUa6/CxmKwZw6ls6+C83+C68 lUTqHz0ebU/3Dm3o7+9Zr1HycF6e3BbLqyEwwUj8= 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 4.4 055/241] fbdev: sm712fb: fix VRAM detection, dont set SR70/71/74/75 Date: Sun, 9 Jun 2019 18:39:57 +0200 Message-Id: <20190609164149.361947105@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164147.729157653@linuxfoundation.org> References: <20190609164147.729157653@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]);