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t=1790675945; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=ypdC/Y2QVx/ngT6s7C2ZYMJtG1EVfJBgff5dSYAsDyM=; b=UUnihWFaiIBdBuw1X4/ZWiK2h/izidM1d1G12sFqC6r+Xf256X0zxskEsNLnPQBFHUnYPF aBhNcEMIgkUQO3hlC9MB0hHSVkoTyiZl8Rd09nBnT2lKfGjWhX3SJTE9XKhyYanhioi//d fMVE5rs/3gKV972jwoB/8wO88C0e0bE= Message-ID: <739ce9f4-8bdb-4bc4-9cc1-9a1a7eba80ce@ixit.cz> Date: Tue, 29 Sep 2026 11:59:04 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 06/11] drm/panel: s6e3ha8: Correct the polarity logic within To: Krzysztof Kozlowski Cc: Dzmitry Sankouski , Neil Armstrong , Jessica Zhang , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Abel Vesa , Petr Vorel , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, phone-devel@vger.kernel.org References: <20260924-crosshatch-panel-v2-0-08d5c7bf72fc@ixit.cz> <20260924-crosshatch-panel-v2-6-08d5c7bf72fc@ixit.cz> <20260929-dramatic-ocelot-of-support-2aa377@quoll> Content-Language: en-US, cs-CZ From: David Heidelberg Autocrypt: addr=david@ixit.cz; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 29/09/2026 11:51, Krzysztof Kozlowski wrote: > On 29/09/2026 11:41, David Heidelberg wrote: >> On 29/09/2026 09:45, Krzysztof Kozlowski wrote: >>> On Thu, Sep 24, 2026 at 04:01:34PM +0200, David Heidelberg wrote: >>>> The reset was introduced with wrong polarity. Correct for the future >>>> compatibles and keep current with reverted logic. >>>> >>>> Old DTs keep GPIO_ACTIVE_HIGH and are fixed up via >>>> gpiod_toggle_active_low() on the deprecated compatible. >>>> >>>> Assisted-by: LLM >>>> Reviewed-by: Neil Armstrong >>>> Signed-off-by: David Heidelberg >>>> --- >>>> drivers/gpu/drm/panel/panel-samsung-s6e3ha8.c | 23 +++++++++++++++++++---- >>>> 1 file changed, 19 insertions(+), 4 deletions(-) >>>> >>>> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e3ha8.c b/drivers/gpu/drm/panel/panel-samsung-s6e3ha8.c >>>> index 5e1e997b83b36..99290913de69a 100644 >>>> --- a/drivers/gpu/drm/panel/panel-samsung-s6e3ha8.c >>>> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e3ha8.c >>>> @@ -20,16 +20,17 @@ >>>> #include "panel-samsung-dsi.h" >>>> >>>> struct s6e3ha8_desc { >>>> const struct drm_panel_funcs *funcs; >>>> const struct drm_display_mode *mode; >>>> unsigned long mode_flags; >>>> const struct regulator_bulk_data *supplies; >>>> unsigned int num_supplies; >>>> + bool broken_reset_polarity; >>>> }; >>>> >>>> struct s6e3ha8 { >>>> struct drm_panel panel; >>>> struct mipi_dsi_device *dsi; >>>> const struct s6e3ha8_desc *desc; >>>> struct drm_dsc_config dsc; >>>> struct gpio_desc *reset_gpio; >>>> @@ -62,22 +63,22 @@ static int s6e3ha8_unprepare(struct drm_panel *panel) >>>> { >>>> struct s6e3ha8 *priv = to_s6e3ha8(panel); >>>> >>>> return regulator_bulk_disable(priv->desc->num_supplies, priv->supplies); >>>> } >>>> >>>> static void s6e3ha8_amb577px01_wqhd_reset(struct s6e3ha8 *priv) >>>> { >>>> - gpiod_set_value_cansleep(priv->reset_gpio, 1); >>>> - usleep_range(5000, 6000); >>>> gpiod_set_value_cansleep(priv->reset_gpio, 0); >>>> usleep_range(5000, 6000); >>>> gpiod_set_value_cansleep(priv->reset_gpio, 1); >>>> usleep_range(5000, 6000); >>>> + gpiod_set_value_cansleep(priv->reset_gpio, 0); >>> >>> This breaks all users and this usage of ABI was already released. >> >> See the gpiod_toggle_active_low() usage later in the patch which keep the logic >> for the original compatible as intended. >> > > OK, I went way too fast, that's correct part. But splitting fix is still > just confusing. Backporting to stable is a different thing than fixing > issues. Sure, I already droped the previous commit changing it for stable. Btw. looking at gpiod_toggle_active_low(), would it make sense to do a series correcting panel reset logic? I see many panels keep "reset asserted" in the driver (but ofc not in the reality). Thanks David > > Best regards, > Krzysztof