From patchwork Fri Jan 25 02:21:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Airlie X-Patchwork-Id: 2038041 Return-Path: X-Original-To: patchwork-dri-devel@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by patchwork1.kernel.org (Postfix) with ESMTP id 756703FD56 for ; Fri, 25 Jan 2013 02:22:04 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4D15BE6D08 for ; Thu, 24 Jan 2013 18:22:04 -0800 (PST) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by gabe.freedesktop.org (Postfix) with ESMTP id 60EF3E5D3D; Thu, 24 Jan 2013 18:21:47 -0800 (PST) Received: from localhost ([127.0.0.1] helo=sfs-ml-3.v29.ch3.sourceforge.com) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1TyYvC-0003XY-O3; Fri, 25 Jan 2013 02:21:38 +0000 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1TyYvB-0003XS-9h for dri-devel@lists.sourceforge.net; Fri, 25 Jan 2013 02:21:37 +0000 Received-SPF: neutral (sog-mx-2.v43.ch3.sourceforge.com: 209.132.183.28 is neither permitted nor denied by domain of gmail.com) client-ip=209.132.183.28; envelope-from=airlied@gmail.com; helo=mx1.redhat.com; Received: from mx1.redhat.com ([209.132.183.28]) by sog-mx-2.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1TyYv9-0003ol-1i for dri-devel@lists.sourceforge.net; Fri, 25 Jan 2013 02:21:37 +0000 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r0P2LTqq012572 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 24 Jan 2013 21:21:29 -0500 Received: from prime.bne.redhat.com (dhcp-40-183.bne.redhat.com [10.64.40.183]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r0P2LRBL022407; Thu, 24 Jan 2013 21:21:27 -0500 From: Dave Airlie To: linux-fbdev@vger.kernel.org Subject: [PATCH] vgacon/vt: clear buffer attributes when we load a 512 character font (v2) Date: Fri, 25 Jan 2013 12:21:26 +1000 Message-Id: <1359080486-19164-1-git-send-email-airlied@gmail.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 X-Spam-Score: 1.9 (+) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (airlied[at]gmail.com) -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 DKIM_ADSP_CUSTOM_MED No valid author signature, adsp_override is CUSTOM_MED 0.7 SPF_NEUTRAL SPF: sender does not match SPF record (neutral) 1.2 NML_ADSP_CUSTOM_MED ADSP custom_med hit, and not from a mailing list X-Headers-End: 1TyYv9-0003ol-1i X-BeenThere: dri-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list MIME-Version: 1.0 Cc: Dave Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.sf.net X-BeenThere: dri-devel@lists.freedesktop.org List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org Errors-To: dri-devel-bounces+patchwork-dri-devel=patchwork.kernel.org@lists.freedesktop.org From: Dave Airlie When we switch from 256->512 byte font rendering mode, it means the current contents of the screen is being reinterpreted. The bit that holds the high bit of the 9-bit font, may have been previously set, and thus the new font misrenders. The problem case we see is grub2 writes spaces with the bit set, so it ends up with data like 0x820, which gets reinterpreted into 0x120 char which the font translates into G with a circumflex. This flashes up on screen at boot and is quite ugly. A current side effect of this patch though is that any rendering on the screen changes color to a slightly darker color, but at least the screen no longer corrupts. v2: as suggested by hpa, always clear the attribute space, whether we are are going to or from 512 chars. Signed-off-by: Dave Airlie f --- drivers/tty/vt/vt.c | 2 +- drivers/video/console/vgacon.c | 22 +++++++++++++++------- include/linux/vt_kern.h | 1 + 3 files changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 8fd8968..c8067ae 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -638,7 +638,7 @@ static inline void save_screen(struct vc_data *vc) * Redrawing of screen */ -static void clear_buffer_attributes(struct vc_data *vc) +void clear_buffer_attributes(struct vc_data *vc) { unsigned short *p = (unsigned short *)vc->vc_origin; int count = vc->vc_screenbuf_size / 2; diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index d449a74..5855d17 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -1064,7 +1064,7 @@ static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512) unsigned short video_port_status = vga_video_port_reg + 6; int font_select = 0x00, beg, i; char *charmap; - + bool clear_attribs = false; if (vga_video_type != VIDEO_TYPE_EGAM) { charmap = (char *) VGA_MAP_MEM(colourmap, 0); beg = 0x0e; @@ -1169,12 +1169,6 @@ static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512) /* if 512 char mode is already enabled don't re-enable it. */ if ((set) && (ch512 != vga_512_chars)) { - /* attribute controller */ - for (i = 0; i < MAX_NR_CONSOLES; i++) { - struct vc_data *c = vc_cons[i].d; - if (c && c->vc_sw == &vga_con) - c->vc_hi_font_mask = ch512 ? 0x0800 : 0; - } vga_512_chars = ch512; /* 256-char: enable intensity bit 512-char: disable intensity bit */ @@ -1185,8 +1179,22 @@ static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512) it means, but it works, and it appears necessary */ inb_p(video_port_status); vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0); + clear_attribs = true; } raw_spin_unlock_irq(&vga_lock); + + if (clear_attribs) { + for (i = 0; i < MAX_NR_CONSOLES; i++) { + struct vc_data *c = vc_cons[i].d; + if (c && c->vc_sw == &vga_con) { + /* force hi font mask to 0, so we always clear + the bit on either transition */ + c->vc_hi_font_mask = 0x00; + clear_buffer_attributes(c); + c->vc_hi_font_mask = ch512 ? 0x0800 : 0; + } + } + } return 0; } diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h index 50ae7d0..1f55665 100644 --- a/include/linux/vt_kern.h +++ b/include/linux/vt_kern.h @@ -47,6 +47,7 @@ int con_set_cmap(unsigned char __user *cmap); int con_get_cmap(unsigned char __user *cmap); void scrollback(struct vc_data *vc, int lines); void scrollfront(struct vc_data *vc, int lines); +void clear_buffer_attributes(struct vc_data *vc); void update_region(struct vc_data *vc, unsigned long start, int count); void redraw_screen(struct vc_data *vc, int is_switch); #define update_screen(x) redraw_screen(x, 0)