From nobody Fri Dec 19 02:49:53 2025 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 0CD5EC46467 for ; Mon, 16 Jan 2023 22:50:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235050AbjAPWuF (ORCPT ); Mon, 16 Jan 2023 17:50:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233599AbjAPWtq (ORCPT ); Mon, 16 Jan 2023 17:49:46 -0500 Received: from mail-io1-xd34.google.com (mail-io1-xd34.google.com [IPv6:2607:f8b0:4864:20::d34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AB73525E24 for ; Mon, 16 Jan 2023 14:49:45 -0800 (PST) Received: by mail-io1-xd34.google.com with SMTP id p66so14186593iof.1 for ; Mon, 16 Jan 2023 14:49:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; 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=NlMIUi+YfP7k/BEEENzXAg+UYL09PWGfuqaTM6sQw0I=; b=o2yBg4ngM8TYFAdxDCcoNdj0A8A3NEvcsdFljaeoCH/3TCPHvUYh1gu/7rItW/mNi/ nrJt9nQu+F4ylYtexOOy5kqJa+VTSfDL5I7aHHLE9aoo6LknK8CVP8hPtIZcWU02uWrO ANhW9KWBc7+t3XNble9Hr1pmThvtY78vyvDE5sm0XiGLtaOMn0xP0NPQDuwO+/M6kkgz OJRi+QE9jZ99DDMCjg0lS8v4dFuI1hWrAi+6JZ6hO0SmhfSKH34It7YmZ2HbTk5Ic6a+ tQhJ3NM9UCbr6be3ndvoVTTKSeEjzJrvfpasn9E732OHIdUtPjW4MjYgSYdgsa/Thrgi VuPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=NlMIUi+YfP7k/BEEENzXAg+UYL09PWGfuqaTM6sQw0I=; b=Z+bY926Dn8Rh2HiJMjQJnxDTPlDStY4sZU6gWZldIIKyiHsWnXNsq+imDamxrG0AgR lhu5g+kH9jODTHR8Z/a+KUePvBPH1jSpqT//d4FyfBIIv2dcce48aEJAQo2MygyHDDrV XmL/UEwUPTkXXHbLd8QgWdS4foMZkw1OHsvKd7G3aOu/SPmpvmrvRZ7jHL5s7RI2vEOo b3CIoLM6JOi6dVfBJ+ii9CYV1FF8QUAmN5ZgKe7OC4D1NCjCJ2cSg2NVXdgwWfSLiz0t oyFel2F88KJZXWk8GXUr7xKpHKpcMkJnI194MGn9RDj3+SnMCoLf2mTdHGO/Rowdnj6+ iNfQ== X-Gm-Message-State: AFqh2koe3Auc/kypYGf3YepZd1z4CnNGJOwPQYCpABjrBWLcQcc0A0GS 3jH0AiS9pE8e5lQJGKfsogRPjFy35SM= X-Google-Smtp-Source: AMrXdXtBDkHSt71z5BDQjMOXx68uplVPX5cYkR0TUt+L/JWg3uuApC+ErwdrSBGTh2X02NhTpZy4/w== X-Received: by 2002:a5d:9905:0:b0:6e0:58c:fb32 with SMTP id x5-20020a5d9905000000b006e0058cfb32mr552719iol.2.1673909385080; Mon, 16 Jan 2023 14:49:45 -0800 (PST) Received: from localhost ([2607:fea8:a2df:3d00::6be]) by smtp.gmail.com with ESMTPSA id f14-20020a056638112e00b0038a346207cdsm9070777jar.84.2023.01.16.14.49.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Jan 2023 14:49:44 -0800 (PST) From: Richard Acayan To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Thierry Reding , Sam Ravnborg , Emil Velikov , Vinay Simha BN , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Daniel Mentz , Caleb Connolly , Neil Armstrong , Richard Acayan Subject: [RFC PATCH v3 1/3] drm/mipi-dsi: Fix byte order of 16-bit DCS set/get brightness Date: Mon, 16 Jan 2023 17:49:07 -0500 Message-Id: <20230116224909.23884-2-mailingradian@gmail.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116224909.23884-1-mailingradian@gmail.com> References: <20230116224909.23884-1-mailingradian@gmail.com> 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" From: Daniel Mentz The MIPI DCS specification demands that brightness values are sent in big endian byte order. It also states that one parameter (i.e. one byte) shall be sent/received for 8 bit wide values, and two parameters shall be used for values that are between 9 and 16 bits wide. Add new functions to properly handle 16-bit brightness in big endian, since the two 8- and 16-bit cases are distinct from each other. Fixes: 1a9d759331b8 ("drm/dsi: Implement DCS set/get display brightness") Signed-off-by: Daniel Mentz Link: https://android.googlesource.com/kernel/msm/+/754affd62d0ee268c686c53= 169b1dbb7deac8550 [richard: fix 16-bit brightness_get] [richard: use separate functions instead of switch/case] [richard: split into 16-bit component] Signed-off-by: Richard Acayan Tested-by: Caleb Connolly Reviewed-by: Neil Armstrong Reviewed-by: Sam Ravnborg --- drivers/gpu/drm/drm_mipi_dsi.c | 52 ++++++++++++++++++++++++++++++++++ include/drm/drm_mipi_dsi.h | 4 +++ 2 files changed, 56 insertions(+) diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 497ef4b6a90a..4bc15fbd009d 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -1224,6 +1224,58 @@ int mipi_dsi_dcs_get_display_brightness(struct mipi_= dsi_device *dsi, } EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness); =20 +/** + * mipi_dsi_dcs_set_display_brightness_large() - sets the 16-bit brightnes= s value + * of the display + * @dsi: DSI peripheral device + * @brightness: brightness value + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi, + u16 brightness) +{ + u8 payload[2] =3D { brightness >> 8, brightness & 0xff }; + ssize_t err; + + err =3D mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, + payload, sizeof(payload)); + if (err < 0) + return err; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness_large); + +/** + * mipi_dsi_dcs_get_display_brightness_large() - gets the current 16-bit + * brightness value of the display + * @dsi: DSI peripheral device + * @brightness: brightness value + * + * Return: 0 on success or a negative error code on failure. + */ +int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi, + u16 *brightness) +{ + u8 brightness_be[2]; + ssize_t err; + + err =3D mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS, + brightness_be, sizeof(brightness_be)); + if (err <=3D 0) { + if (err =3D=3D 0) + err =3D -ENODATA; + + return err; + } + + *brightness =3D (brightness_be[0] << 8) | brightness_be[1]; + + return 0; +} +EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness_large); + static int mipi_dsi_drv_probe(struct device *dev) { struct mipi_dsi_driver *drv =3D to_mipi_dsi_driver(dev->driver); diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index 4f503d99f668..16f30975b22b 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -296,6 +296,10 @@ int mipi_dsi_dcs_set_display_brightness(struct mipi_ds= i_device *dsi, u16 brightness); int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, u16 *brightness); +int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi, + u16 brightness); +int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi, + u16 *brightness); =20 /** * mipi_dsi_generic_write_seq - transmit data using a generic write packet --=20 2.39.0 From nobody Fri Dec 19 02:49:53 2025 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 D4241C46467 for ; Mon, 16 Jan 2023 22:50:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233543AbjAPWuM (ORCPT ); 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Mon, 16 Jan 2023 14:49:46 -0800 (PST) From: Richard Acayan To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Thierry Reding , Sam Ravnborg , Emil Velikov , Vinay Simha BN , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Daniel Mentz , Caleb Connolly , Neil Armstrong , Richard Acayan Subject: [RFC PATCH v3 2/3] drm/panel: sofef00: Use 16-bit brightness function Date: Mon, 16 Jan 2023 17:49:08 -0500 Message-Id: <20230116224909.23884-3-mailingradian@gmail.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116224909.23884-1-mailingradian@gmail.com> References: <20230116224909.23884-1-mailingradian@gmail.com> 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" These panels communicate brightness in big endian. This is not a quirk of the panels themselves, but rather, a part of the MIPI standard. Use the new mipi_dsi_dcs_set_display_brightness_large() function that properly handles 16-bit brightness instead of doing special processing of the brightness values. Signed-off-by: Richard Acayan Tested-by: Caleb Connolly Reviewed-by: Neil Armstrong Reviewed-by: Sam Ravnborg --- drivers/gpu/drm/panel/panel-samsung-sofef00.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef00.c b/drivers/gpu/dr= m/panel/panel-samsung-sofef00.c index 9db49a028930..1ebb79e3103c 100644 --- a/drivers/gpu/drm/panel/panel-samsung-sofef00.c +++ b/drivers/gpu/drm/panel/panel-samsung-sofef00.c @@ -10,7 +10,6 @@ #include #include #include -#include #include =20 #include