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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4675EC433FE for ; Thu, 17 Mar 2022 08:18:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230470AbiCQIUF (ORCPT ); Thu, 17 Mar 2022 04:20:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229733AbiCQIT6 (ORCPT ); Thu, 17 Mar 2022 04:19:58 -0400 Received: from michel.telenet-ops.be (michel.telenet-ops.be [IPv6:2a02:1800:110:4::f00:18]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A10D149648 for ; Thu, 17 Mar 2022 01:18:38 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed40:f500:58f9:d953:424b]) by michel.telenet-ops.be with bizsmtp id 7LJa2700R0M4NNo06LJaKT; Thu, 17 Mar 2022 09:18:36 +0100 Received: from rox.of.borg ([192.168.97.57] helo=rox) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1nUlL8-004vC9-4S; Thu, 17 Mar 2022 09:18:34 +0100 Received: from geert by rox with local (Exim 4.93) (envelope-from ) id 1nUlL7-00559q-8c; Thu, 17 Mar 2022 09:18:33 +0100 From: Geert Uytterhoeven To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Javier Martinez Canillas , =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= Cc: Andy Shevchenko , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v2 3/5] drm/ssd130x: Fix rectangle updates Date: Thu, 17 Mar 2022 09:18:28 +0100 Message-Id: <20220317081830.1211400-4-geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220317081830.1211400-1-geert@linux-m68k.org> References: <20220317081830.1211400-1-geert@linux-m68k.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The rectangle update functions ssd130x_fb_blit_rect() and ssd130x_update_rect() do not behave correctly when x1 != 0 or y1 != 0, or when y1 or y2 are not aligned to display page boundaries. E.g. when used as a text console, only the first line of text is shown on the display. 1. The buffer passed by ssd130x_fb_blit_rect() points to the first byte of monochrome bitmap data, and thus has its origin at (x1, y1), while ssd130x_update_rect() assumes it is at (0, 0). Fix ssd130x_update_rect() by changing the vertical and horizontal loop ranges, and adding the offsets only when needed. 2. In ssd130x_fb_blit_rect(), align y1 and y2 to the display page boundaries before doing the color conversion, so the full page is converted and updated. Remove the correction for an unaligned y1 from ssd130x_update_rect(), and add a check to make sure y1 is aligned. Fixes: a61732e808672cfa ("drm: Add driver for Solomon SSD130x OLED displays") Signed-off-by: Geert Uytterhoeven Acked-by: Javier Martinez Canillas --- v2: - Add Acked-by. Note that instead of calling drm_fb_xrgb8888_to_mono() and transposing the bitmap, the image data could be converted to the transposed format directly. However, that would preclude exposing a monochrome format to userspace when a fourcc for such a monochrome format is introduced. --- drivers/gpu/drm/solomon/ssd130x.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index caee851efd5726e7..7c99af4ce9dd4e5c 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -355,11 +355,14 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf, unsigned int width = drm_rect_width(rect); unsigned int height = drm_rect_height(rect); unsigned int line_length = DIV_ROUND_UP(width, 8); - unsigned int pages = DIV_ROUND_UP(y % 8 + height, 8); + unsigned int pages = DIV_ROUND_UP(height, 8); + struct drm_device *drm = &ssd130x->drm; u32 array_idx = 0; int ret, i, j, k; u8 *data_array = NULL; + drm_WARN_ONCE(drm, y % 8 != 0, "y must be aligned to screen page\n"); + data_array = kcalloc(width, pages, GFP_KERNEL); if (!data_array) return -ENOMEM; @@ -401,13 +404,13 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf, if (ret < 0) goto out_free; - for (i = y / 8; i < y / 8 + pages; i++) { + for (i = 0; i < pages; i++) { int m = 8; /* Last page may be partial */ - if (8 * (i + 1) > ssd130x->height) + if (8 * (y / 8 + i + 1) > ssd130x->height) m = ssd130x->height % 8; - for (j = x; j < x + width; j++) { + for (j = 0; j < width; j++) { u8 data = 0; for (k = 0; k < m; k++) { @@ -454,6 +457,10 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m int ret = 0; u8 *buf = NULL; + /* Align y to display page boundaries */ + rect->y1 = round_down(rect->y1, 8); + rect->y2 = min_t(unsigned int, round_up(rect->y2, 8), ssd130x->height); + buf = kcalloc(fb->width, fb->height, GFP_KERNEL); if (!buf) return -ENOMEM; -- 2.25.1