From nobody Tue Feb 10 01:16:16 2026 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 DCE87C001DE for ; Fri, 4 Aug 2023 21:08:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230484AbjHDVIh (ORCPT ); Fri, 4 Aug 2023 17:08:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231146AbjHDVIH (ORCPT ); Fri, 4 Aug 2023 17:08:07 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90D1E559E for ; Fri, 4 Aug 2023 14:07:18 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id d2e1a72fcca58-686f090310dso2442063b3a.0 for ; Fri, 04 Aug 2023 14:07:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1691183237; x=1691788037; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=+K4pAadzRZN083YWndwfDzadQIgjy+stzVGii5iIJGU=; b=T1UYVJsN721ozkISMV86q9Yazgfhma0y3bUeJgLTkokFM2FXoQfsXSElONE+8QorfW 6KJCMyYa6HwgGob86Pamhm3mAAKLOuEG/C24hVShpaprAQaj9ga275WVxyVBsuNTp4Xq 4YsIw1eOx9vVerNFIlXmAaIu6WLUGVO5/Ovsk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691183237; x=1691788037; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=+K4pAadzRZN083YWndwfDzadQIgjy+stzVGii5iIJGU=; b=kWaxTDyHtCTTLteBhMDbTbBTzVLB1/vedAyePrz3q11FIRLR4QJiZOnyyCSl/ydM7c 05tOm0JijHFtB9w44cPcj0IRkrVRRkgjjWm4H7/CdNftYVFbp+J5Xt8wtlnPsJO/LxZg 0Hm2swsKfSt3xYAGjFrxLGXM9+qVAC87JO/OPptwaEufiw3Cb/g0aV/38SF7KxWolK9w FR/ryZxbI6l+EErfrzRtqWbWul3HSi/rXWu4swBJ7HT/dKIUTBGXjopKjDFQyOuKH3eR D8foJ3U9sQrCzBtomsMF1nUoO3t4jP+NeXkM9fSGOA+epzftQ02RJk6cwKbqnENcL13v zbAg== X-Gm-Message-State: AOJu0YxpBjoaMkxq8cirCi/Fw1cwucTcOyC8MSI3K5iSI7J+mNvRwBLu s1wjsT34jxk69q0nhqGsUWxCxw== X-Google-Smtp-Source: AGHT+IGmH6I8v9mGTkjyzHcFPAzmzyunDSLA0TNtyofGKN5WngoOgQ9qT4q8whBF8qocjpEoAnGaUA== X-Received: by 2002:a05:6a21:7189:b0:133:f860:ac42 with SMTP id wq9-20020a056a21718900b00133f860ac42mr3100626pzb.34.1691183236984; Fri, 04 Aug 2023 14:07:16 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:e186:e5d2:e60:bad3]) by smtp.gmail.com with ESMTPSA id n22-20020aa78a56000000b0068664ace38asm2037584pfa.19.2023.08.04.14.07.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Aug 2023 14:07:15 -0700 (PDT) From: Douglas Anderson To: dri-devel@lists.freedesktop.org, Maxime Ripard Cc: Linus Walleij , Douglas Anderson , Daniel Vetter , David Airlie , Neil Armstrong , Sam Ravnborg , linux-kernel@vger.kernel.org Subject: [RFC PATCH 02/10] drm/panel: s6e63m0: Don't store+check prepared/enabled Date: Fri, 4 Aug 2023 14:06:05 -0700 Message-ID: <20230804140605.RFC.2.Iabafd062e70f6b6b554cf23eeb75f57a80f7e985@changeid> X-Mailer: git-send-email 2.41.0.585.gd2178a4bd4-goog In-Reply-To: <20230804210644.1862287-1-dianders@chromium.org> References: <20230804210644.1862287-1-dianders@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" As talked about in commit d2aacaf07395 ("drm/panel: Check for already prepared/enabled in drm_panel"), we want to remove needless code from panel drivers that was storing and double-checking the prepared/enabled state. Even if someone was relying on the double-check before, that double-check is now in the core and not needed in individual drivers. For the s6e63m0 panel driver, this actually fixes a subtle/minor error handling bug in s6e63m0_prepare(). In one error case s6e63m0_prepare() called s6e63m0_unprepare() directly if there was an error. This call to s6e63m0_unprepare() would have been a no-op since ctx->prepared wasn't set yet. Signed-off-by: Douglas Anderson --- drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 25 ------------------- 1 file changed, 25 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/dr= m/panel/panel-samsung-s6e63m0.c index b34fa4d5de07..a0e5698275a5 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c @@ -270,9 +270,6 @@ struct s6e63m0 { struct regulator_bulk_data supplies[2]; struct gpio_desc *reset_gpio; =20 - bool prepared; - bool enabled; - /* * This field is tested by functions directly accessing bus before * transfer, transfer is skipped if it is set. In case of transfer @@ -502,9 +499,6 @@ static int s6e63m0_disable(struct drm_panel *panel) { struct s6e63m0 *ctx =3D panel_to_s6e63m0(panel); =20 - if (!ctx->enabled) - return 0; - backlight_disable(ctx->bl_dev); =20 s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF); @@ -512,8 +506,6 @@ static int s6e63m0_disable(struct drm_panel *panel) s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE); msleep(120); =20 - ctx->enabled =3D false; - return 0; } =20 @@ -522,17 +514,12 @@ static int s6e63m0_unprepare(struct drm_panel *panel) struct s6e63m0 *ctx =3D panel_to_s6e63m0(panel); int ret; =20 - if (!ctx->prepared) - return 0; - s6e63m0_clear_error(ctx); =20 ret =3D s6e63m0_power_off(ctx); if (ret < 0) return ret; =20 - ctx->prepared =3D false; - return 0; } =20 @@ -541,9 +528,6 @@ static int s6e63m0_prepare(struct drm_panel *panel) struct s6e63m0 *ctx =3D panel_to_s6e63m0(panel); int ret; =20 - if (ctx->prepared) - return 0; - ret =3D s6e63m0_power_on(ctx); if (ret < 0) return ret; @@ -564,8 +548,6 @@ static int s6e63m0_prepare(struct drm_panel *panel) if (ret < 0) s6e63m0_unprepare(panel); =20 - ctx->prepared =3D true; - return ret; } =20 @@ -573,9 +555,6 @@ static int s6e63m0_enable(struct drm_panel *panel) { struct s6e63m0 *ctx =3D panel_to_s6e63m0(panel); =20 - if (ctx->enabled) - return 0; - s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE); msleep(120); s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON); @@ -588,8 +567,6 @@ static int s6e63m0_enable(struct drm_panel *panel) =20 backlight_enable(ctx->bl_dev); =20 - ctx->enabled =3D true; - return 0; } =20 @@ -709,8 +686,6 @@ int s6e63m0_probe(struct device *dev, void *trsp, dev_set_drvdata(dev, ctx); =20 ctx->dev =3D dev; - ctx->enabled =3D false; - ctx->prepared =3D false; =20 ret =3D device_property_read_u32(dev, "max-brightness", &max_brightness); if (ret) --=20 2.41.0.585.gd2178a4bd4-goog