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Date: Mon, 07 Sep 2015 10:27:25 +0800
From: Yakir Yang <ykk@...k-chips.com>
To: Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Heiko Stuebner <heiko@...ech.de>,
Thierry Reding <treding@...dia.com>,
Jingoo Han <jingoohan1@...il.com>,
Inki Dae <inki.dae@...sung.com>, joe@...ches.com,
Kukjin Kim <kgene@...nel.org>,
Mark Yao <mark.yao@...k-chips.com>
CC: Russell King <rmk+kernel@....linux.org.uk>, djkurtz@...omium.com,
dianders@...omium.com, seanpaul@...omium.com, ajaynumb@...il.com,
Andrzej Hajda <a.hajda@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
David Airlie <airlied@...ux.ie>,
Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
Andy Yan <andy.yan@...k-chips.com>,
Kumar Gala <galak@...eaurora.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Kishon Vijay Abraham I <kishon@...com>,
architt@...eaurora.org, robherring2@...il.com,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
linux-rockchip@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 03/16] drm: bridge: analogix/dp: split exynos dp driver
to bridge dir
Hi Krzysztof,
在 09/07/2015 08:22 AM, Krzysztof Kozlowski 写道:
> On 06.09.2015 16:49, Yakir Yang wrote:
>> Hi Krzysztof,
>>
>> 在 09/04/2015 08:41 AM, Krzysztof Kozlowski 写道:
>>> On 03.09.2015 14:30, Yakir Yang wrote:
>>>> Hi Krzysztof,
>>>>
>>>> 在 09/03/2015 08:58 AM, Krzysztof Kozlowski 写道:
>>>>> On 01.09.2015 14:49, Yakir Yang wrote:
>>>>>> Split the dp core driver from exynos directory to bridge
>>>>>> directory, and rename the core driver to analogix_dp_*,
>>>>>> leave the platform code to analogix_dp-exynos.
>>>>>>
>>>>>> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
>>>>>> ---
>>>>>> Changes in v4:
>>>>>> - Take Rob suggest, update "analogix,hpd-gpios" to "hpd-gpios" DT
>>>>>> propery.
>>>>>> - Take Jingoo suggest, rename "analogix_dp-exynos.c" file name to
>>>>>> "exynos_dp.c"
>>>>>> - Take Archit suggest, create a separate folder for analogix code in
>>>>>> bridge/
>>>>>>
>>>>>> Changes in v3:
>>>>>> - Take Thierry Reding suggest, move exynos's video_timing code
>>>>>> to analogix_dp-exynos platform driver, add get_modes method
>>>>>> to struct analogix_dp_plat_data.
>>>>>> - Take Heiko suggest, rename some "samsung*" dts propery to
>>>>>> "analogix*".
>>>>>>
>>>>>> Changes in v2:
>>>>>> - Take Jingoo Han suggest, remove new copyright
>>>>>> - Fix compiled failed dut to analogix_dp_device misspell
>> [.....]
>>
>>>>>> -static int exynos_dp_bridge_attach(struct drm_bridge *bridge)
>>>>>> +static int analogix_dp_bridge_attach(struct drm_bridge *bridge)
>>>>>> {
>>>>>> - struct exynos_dp_device *dp = bridge->driver_private;
>>>>>> - struct drm_encoder *encoder = &dp->encoder;
>>>>>> + struct analogix_dp_device *dp = bridge->driver_private;
>>>>>> + struct drm_encoder *encoder = dp->encoder;
>>>>>> struct drm_connector *connector = &dp->connector;
>>>>>> int ret;
>>>>>> - /* Pre-empt DP connector creation if there's a bridge */
>>>>>> - if (dp->ptn_bridge) {
>>>>>> - ret = exynos_drm_attach_lcd_bridge(dp, encoder);
>>>>>> - if (!ret)
>>>>>> - return 0;
>>>>>> + if (!bridge->encoder) {
>>>>>> + DRM_ERROR("Parent encoder object not found");
>>>>>> + return -ENODEV;
>>>>>> }
>>>>>> + encoder->bridge = bridge;
>>>>>> +
>>>>>> connector->polled = DRM_CONNECTOR_POLL_HPD;
>>>>>> ret = drm_connector_init(dp->drm_dev, connector,
>>>>>> - &exynos_dp_connector_funcs,
>>>>>> + &analogix_dp_connector_funcs,
>>>>>> DRM_MODE_CONNECTOR_eDP);
>>>>>> if (ret) {
>>>>>> DRM_ERROR("Failed to initialize connector with drm\n");
>>>>>> return ret;
>>>>>> }
>>>>>> - drm_connector_helper_add(connector,
>>>>>> &exynos_dp_connector_helper_funcs);
>>>>>> + drm_connector_helper_add(connector,
>>>>>> + &analogix_dp_connector_helper_funcs);
>>>>>> drm_connector_register(connector);
>>>>>> drm_mode_connector_attach_encoder(connector, encoder);
>>>>>> - if (dp->panel)
>>>>>> - ret = drm_panel_attach(dp->panel, &dp->connector);
>>>>>> + if (dp->plat_data && dp->plat_data->panel) {
>>>>>> + ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
>>>>>> + if (ret) {
>>>>>> + DRM_ERROR("Failed to attach panel\n");
>>>>>> + return ret;
>>>>>> + }
>>>>>> + }
>>>>>> +
>>>>>> + /*
>>>>>> + * This should be the end of attach function, caused
>>>>>> + * we should ensure dp bridge could attach first.
>>>>>> + */
>>>>>> + if (dp->plat_data && dp->plat_data->attach) {
>>>>>> + ret = dp->plat_data->attach(dp->plat_data, bridge);
>>>>>> + if (ret) {
>>>>>> + DRM_ERROR("Failed at platform attch func\n");
>>>>> Two new error paths appeared here and above. Don't you have to
>>>>> cleanup something? I don't know, just wondering...
>>>> Hmm... I think both panel & platform_attch need ERROR remind when
>>>> it failed. But if it still need clean, I though it should clean the
>>>> platform attch
>>>> error,
>>>> this is not relate to DRM directly, just analogix driver logic, so
>>>> code would like,
>>>>
>>>> - if (dp->panel)
>>>> - ret = drm_panel_attach(dp->panel, &dp->connector);
>>>> + if (dp->plat_data && dp->plat_data->panel) {
>>>> + ret = drm_panel_attach(dp->plat_data->panel, &dp->connector);
>>>> + if (ret) {
>>>> + DRM_ERROR("Failed to attach panel\n");
>>>> + return ret;
>>>> + }
>>>> + }
>>>>
>>>> + /*
>>>> + * This should be the end of attach function, caused
>>>> + * we should ensure dp bridge could attach first.
>>>> + */
>>>> + if (dp->plat_data && dp->plat_data->attach) {
>>>> + ret = dp->plat_data->attach(dp->plat_data, bridge);
>>>>
>>>> return ret;
>>> I am lost... the code looks the same. What did you change?
>> I just remove the DRM_ERROR after dp->plat_data->attach(),
>> maybe I should paste the change that rebase on this patch,
>> here are they,
>>
>> /*
>> * This should be the end of attach function, caused
>> * we should ensure dp bridge could attach first.
>> */
>> - if (dp->plat_data && dp->plat_data->attach) {
>> + if (dp->plat_data && dp->plat_data->attach)
>> ret = dp->plat_data->attach(dp->plat_data, bridge);
>> - if (ret) {
>> - DRM_ERROR("Failed at platform attch func\n");
>> - return ret;
>> - }
>> - }
>>
>> - return 0;
>> + return ret;
>>
>>
>> If this haven't meet your comment, I maybe start to think that
>> your comment "Two new error paths appeared here and above"
>> indicated that those two function is the same.
>> "dp->plat_data->attach(dp->plat_data, bridge); "
>> "drm_panel_attach(dp->plat_data->panel, &dp->connector); "
> I wasn't talking about error message but rather about possible need of
> clean up in error path. Previously there was only drm_panel_attach().
> Now you have two of them (drm_panel_attach() and
> dp->plat_data->attach()). If the second fails don't you have to clean up
> before exit? I don't know, just asking.
Oh... Sorry about missing your words. Yes,
drm_panel_detach(dp->plat_data->panel)
was missed in this error path.
Thanks,
- Yakir
>
> Best regards,
> Krzysztof
>
>
>
>
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