From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758539AbcG1OGq (ORCPT ); Thu, 28 Jul 2016 10:06:46 -0400 Received: from mail-yw0-f175.google.com ([209.85.161.175]:32797 "EHLO mail-yw0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758102AbcG1OGj (ORCPT ); Thu, 28 Jul 2016 10:06:39 -0400 MIME-Version: 1.0 In-Reply-To: <57997BED.4050600@rock-chips.com> References: <1469106874-4912-1-git-send-email-ykk@rock-chips.com> <1469106886-4979-1-git-send-email-ykk@rock-chips.com> <57917011.6000108@rock-chips.com> <57997BED.4050600@rock-chips.com> From: Sean Paul Date: Thu, 28 Jul 2016 10:06:15 -0400 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable To: Yakir Yang Cc: Mark Yao , Inki Dae , Thierry Reding , Heiko Stuebner , Jingoo Han , Javier Martinez Canillas , =?UTF-8?Q?St=C3=A9phane_Marchesin?= , Tomasz Figa , Douglas Anderson , David Airlie , Daniel Vetter , Krzysztof Kozlowski , Emil Velikov , Linux Kernel Mailing List , dri-devel , linux-samsung-soc , linux-rockchip@lists.infradead.org Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 27, 2016 at 11:28 PM, Yakir Yang wrote: > Sean, > > Oops, sorry about miss your suggest :( > > > On 07/22/2016 11:03 PM, Sean Paul wrote: >> >> On Thu, Jul 21, 2016 at 9:00 PM, Yakir Yang wrote: >>> >>> Sean, >>> >>> Thanks for your fast respond :-) >>> >>> But this patch is not the latest one, I have upgraded this to "v1.1" >>> version >>> to fix the eDP can't be disabled problem: >>> [PATCH v1.1 2/2] drm/bridge: analogix_dp: turn off the panel when >>> eDP >>> need to disable >>> Changes in v1.1: - unprepare the panel at the end of >>> bridge->disable() function >>> >>> In spite of this, I would take your comments with my "v1.1" patch. >>> >>> On 07/21/2016 10:28 PM, Sean Paul wrote: >>> >>> On Thu, Jul 21, 2016 at 9:14 AM, Yakir Yang wrote: >>> >>> Some panels (like Sharp LQ123P1JX31) need to be turn off when eDP >>> controller stop to send valid video signal, otherwhise panel would >>> go burn in, and keep flicker and flicker. >>> >>> So it's better to turn off the panel when eDP need to disable, and >>> we need to turn on the panel in connector->detect() callback, so >>> that driver would detect panel status rightly. >>> >>> Signed-off-by: Yakir Yang >>> --- >>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 18 >>> ++++++++++-------- >>> 1 file changed, 10 insertions(+), 8 deletions(-) >>> >>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >>> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >>> index 32715da..ea059b3 100644 >>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c >>> @@ -961,6 +961,14 @@ analogix_dp_detect(struct drm_connector *connector, >>> bool force) >>> { >>> struct analogix_dp_device *dp = to_dp(connector); >>> >>> + /* >>> + * Panle would prepare for several times here, but don't worry it >>> >>> s/Panle/Panel/ >>> >>> >>> Done >>> >>> + * would only enable the hardware at the first prepare time. >>> >>> Errr, this shouldn't go in detect. How about putting this in >>> bridge_enable instead? >>> >>> >>> Nope, if we put this in bridge_enable, then eDP would never be enabled. >>> Here're the calling flow. >>> >>> --> analogix_dp_probe >>> --> analogix_dp_bind # we still haven't prepared the panel here, that >>> means panel have been powered up >>> --> analogix_dp_detect # Oops, losing panel valid hotplug signal, >>> cause >>> panel have been powered up >>> --> ** Keep detecting ** >> >> >> Yeah, after playing around with the patch yesterday I discovered this >> for myself. I still don't think detect() should be changing hardware >> state. Perhaps you could add a matching unprepare() after you attempt >> to detect the panel? > > > Hmm, I don't understand the meaning of "add a matching unprepare()". > > I didn't see there is an unprepare() callback in drm_crtc_helper.h, would > you like to share some simple code :-D > In other words, make sure the hardware is in the same state at the beginning and end of detect(). You shouldn't have the panel in a different state when you exit detect(). Sean > Thanks, > - Yakir > > >> Sean >> >>> + */ >>> + if (dp->plat_data->panel) >>> + if (drm_panel_prepare(dp->plat_data->panel)) >>> >>> Personally, I don't like doing work in a conditional since you're >>> throwing the return code away. Could you break this out into: >>> >>> ret = drm_panel_prepare(dp->plat_data->panel); >>> if (ret) >>> DRM_ERROR("failed to setup the panel ret=%d\n", ret); >>> >>> >>> Okay >>> >>> >>> + DRM_ERROR("failed to setup the panel\n"); >>> + >>> if (analogix_dp_detect_hpd(dp)) >>> return connector_status_disconnected; >>> >>> @@ -1063,7 +1071,8 @@ static void analogix_dp_bridge_disable(struct >>> drm_bridge *bridge) >>> return; >>> >>> if (dp->plat_data->panel) { >>> - if (drm_panel_disable(dp->plat_data->panel)) { >>> + if (drm_panel_disable(dp->plat_data->panel) || >>> + drm_panel_unprepare(dp->plat_data->panel)) { >>> >>> Same comment here, please break this out into separate statements for >>> better readability/logging. >>> >>> >>> Okay, >>> >>> >>> Thanks, >>> - Yakir >>> >>> >>> DRM_ERROR("failed to disable the panel\n"); >>> return; >>> } >>> @@ -1333,13 +1342,6 @@ int analogix_dp_bind(struct device *dev, struct >>> drm_device *drm_dev, >>> >>> phy_power_on(dp->phy); >>> >>> - if (dp->plat_data->panel) { >>> - if (drm_panel_prepare(dp->plat_data->panel)) { >>> - DRM_ERROR("failed to setup the panel\n"); >>> - return -EBUSY; >>> - } >>> - } >>> - >>> analogix_dp_init_dp(dp); >>> >>> ret = devm_request_threaded_irq(&pdev->dev, dp->irq, >>> -- >>> 1.9.1 >>> >>> >>> >>> >>> >> >> > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" > in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sean Paul Subject: Re: [PATCH v1 2/2] drm/bridge: analogix_dp: turn off the panel when eDP need to disable Date: Thu, 28 Jul 2016 10:06:15 -0400 Message-ID: References: <1469106874-4912-1-git-send-email-ykk@rock-chips.com> <1469106886-4979-1-git-send-email-ykk@rock-chips.com> <57917011.6000108@rock-chips.com> <57997BED.4050600@rock-chips.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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