From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm1-f65.google.com ([209.85.128.65]:36314 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726253AbeLLGOK (ORCPT ); Wed, 12 Dec 2018 01:14:10 -0500 Received: by mail-wm1-f65.google.com with SMTP id a18so4625596wmj.1 for ; Tue, 11 Dec 2018 22:14:09 -0800 (PST) Date: Wed, 12 Dec 2018 06:14:04 +0000 From: Lee Jones To: Enric Balletbo i Serra Cc: linux-kernel@vger.kernel.org, robert.jarzmik@free.fr, daniel.thompson@linaro.org, kernel@collabora.com, heiko@sntech.de, stable@vger.kernel.org, u.kleine-koenig@pengutronix.de, linux-pwm@vger.kernel.org, linux-fbdev@vger.kernel.org, Thierry Reding , Bartlomiej Zolnierkiewicz , dri-devel@lists.freedesktop.org, Jingoo Han Subject: Re: [RESEND PATCH v3] backlight: pwm_bl: Fix brightness levels for non-DT case. Message-ID: <20181212061404.GK4497@dell> References: <20181210121437.30170-1-enric.balletbo@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20181210121437.30170-1-enric.balletbo@collabora.com> Sender: stable-owner@vger.kernel.org List-ID: On Mon, 10 Dec 2018, Enric Balletbo i Serra wrote: > Commit '88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED > linearly to human eye")' allows the possibility to compute a default > brightness table when there isn't the brightness-levels property in the > DT. Unfortunately the changes made broke the pwm backlight for the > non-DT boards. > > Usually, the non-DT boards don't pass the brightness levels via platform > data, instead, it sets the max_brightness in their platform data and the > driver calculates the level without a table. The offending patch assumed > that when there is no brightness levels table we should create one, but this > is clearly wrong for the non-DT case. > > After this patch the code handles the DT and the non-DT case taking in > consideration also if max_brightness is set or not. > > Fixes: 88ba95bedb79 ("backlight: pwm_bl: Compute brightness of LED linearly to human eye") > Cc: > Reported-by: Robert Jarzmik > Signed-off-by: Enric Balletbo i Serra > Tested-by: Robert Jarzmik > Acked-by: Daniel Thompson > --- > > Changes in v3: > - Fixed some typos in commit message. > - Removed ' in Fixes tag. > > Changes in v2: > - Rebase on top of mainline > - Add Tested-by and Acked-by tags. > > drivers/video/backlight/pwm_bl.c | 41 +++++++++++++++++++++++++++----- > 1 file changed, 35 insertions(+), 6 deletions(-) FYI, this patch is now in Mainline. -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog