Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755386AbbHXTh7 (ORCPT ); Mon, 24 Aug 2015 15:37:59 -0400 Received: from ns.gsystem.sk ([62.176.172.50]:60903 "EHLO gsystem.sk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752296AbbHXThz (ORCPT ); Mon, 24 Aug 2015 15:37:55 -0400 From: Ondrej Zary To: Krzysztof Helt Cc: Tomi Valkeinen , linux-fbdev@vger.kernel.org, Kernel development list Subject: [PATCH 1/4] [resend #2] tridentfb: fix hang on Blade3D with CONFIG_CC_OPTIMIZE_FOR_SIZE Date: Mon, 24 Aug 2015 21:37:25 +0200 Message-Id: <1440445048-24694-1-git-send-email-linux@rainbow-software.org> X-Mailer: git-send-email 1.7.10.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1330 Lines: 35 When the kernel is compiled with -Os (CONFIG_CC_OPTIMIZE_FOR_SIZE), tridentfb hangs the machine upon load with Blade3D cards unless acceleration is disabled. This is caused by memcpy() which copies data byte-by-byte (rep movsb) when compiled with -Os. The card does not like that - it requires 32-bit access. Use iowrite_32() instead. Signed-off-by: Ondrej Zary Acked-by: Krzysztof Helt --- drivers/video/fbdev/tridentfb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/video/fbdev/tridentfb.c b/drivers/video/fbdev/tridentfb.c index 7ed9a22..7429713 100644 --- a/drivers/video/fbdev/tridentfb.c +++ b/drivers/video/fbdev/tridentfb.c @@ -226,7 +226,7 @@ static void blade_image_blit(struct tridentfb_par *par, const char *data, writemmr(par, DST1, point(x, y)); writemmr(par, DST2, point(x + w - 1, y + h - 1)); - memcpy(par->io_virt + 0x10000, data, 4 * size); + iowrite32_rep(par->io_virt + 0x10000, data, size); } static void blade_copy_rect(struct tridentfb_par *par, -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/