From patchwork Tue Oct 19 14:45:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 12570153 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9ACFCC433EF for ; Tue, 19 Oct 2021 14:47:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7FC8D6115A for ; Tue, 19 Oct 2021 14:47:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232633AbhJSOtN (ORCPT ); Tue, 19 Oct 2021 10:49:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232713AbhJSOsA (ORCPT ); Tue, 19 Oct 2021 10:48:00 -0400 Received: from baptiste.telenet-ops.be (baptiste.telenet-ops.be [IPv6:2a02:1800:120:4::f00:13]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECEBAC0617AF for ; Tue, 19 Oct 2021 07:45:32 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed20:b4c3:ba80:54db:46f]) by baptiste.telenet-ops.be with bizsmtp id 7qlT2600G12AN0U01qlTMy; Tue, 19 Oct 2021 16:45:30 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1mcqMp-006B4a-D3; Tue, 19 Oct 2021 16:45:27 +0200 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1mcqMn-00FABL-P2; Tue, 19 Oct 2021 16:45:25 +0200 From: Geert Uytterhoeven To: Miguel Ojeda Cc: Robin van der Gracht , Rob Herring , Paul Burton , Greg Kroah-Hartman , Pavel Machek , Marek Behun , devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v8 10/21] auxdisplay: ht16k33: Fix frame buffer device blanking Date: Tue, 19 Oct 2021 16:45:09 +0200 Message-Id: <20211019144520.3613926-11-geert@linux-m68k.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211019144520.3613926-1-geert@linux-m68k.org> References: <20211019144520.3613926-1-geert@linux-m68k.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org As the ht16k33 frame buffer sub-driver does not register an fb_ops.fb_blank() handler, blanking does not work: $ echo 1 > /sys/class/graphics/fb0/blank sh: write error: Invalid argument Fix this by providing a handler that always returns zero, to make sure blank events will be sent to the actual device handling the backlight. Reported-by: Robin van der Gracht Suggested-by: Robin van der Gracht Fixes: 8992da44c6805d53 ("auxdisplay: ht16k33: Driver for LED controller") Signed-off-by: Geert Uytterhoeven --- v8: - No changes, v7: - New. --- drivers/auxdisplay/ht16k33.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c index 2b630e194570f6e5..ed5808349990782c 100644 --- a/drivers/auxdisplay/ht16k33.c +++ b/drivers/auxdisplay/ht16k33.c @@ -219,6 +219,15 @@ static const struct backlight_ops ht16k33_bl_ops = { .check_fb = ht16k33_bl_check_fb, }; +/* + * Blank events will be passed to the actual device handling the backlight when + * we return zero here. + */ +static int ht16k33_blank(int blank, struct fb_info *info) +{ + return 0; +} + static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma) { struct ht16k33_priv *priv = info->par; @@ -231,6 +240,7 @@ static const struct fb_ops ht16k33_fb_ops = { .owner = THIS_MODULE, .fb_read = fb_sys_read, .fb_write = fb_sys_write, + .fb_blank = ht16k33_blank, .fb_fillrect = sys_fillrect, .fb_copyarea = sys_copyarea, .fb_imageblit = sys_imageblit,