From: ykk@rock-chips•com (Yakir Yang)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v14.1 01/17] drm: bridge: analogix/dp: split exynos dp driver to bridge directory
Date: Wed, 8 Jun 2016 18:53:11 +0800 [thread overview]
Message-ID: <5757F917.2030506@rock-chips.com> (raw)
In-Reply-To: <20160608084419.602f02d2@arm.com>
Marc, Javier
On 06/08/2016 03:44 PM, Marc Zyngier wrote:
> On Wed, 8 Jun 2016 09:28:32 +0800
> Yakir Yang <ykk@rock-chips•com> wrote:
>
>> Hi Javier,
>>
>> On 06/08/2016 01:06 AM, Javier Martinez Canillas wrote:
>>> Hello Yakir,
>>>
>>> On 03/17/2016 05:47 PM, Heiko St?bner wrote:
>>>> Split the dp core driver from exynos directory to bridge directory,
>>>> and rename the core driver to analogix_dp_*, rename the platform
>>>> code to exynos_dp.
>>>>
>>>> Beside the new analogix_dp driver would export six hooks.
>>>> "analogix_dp_bind()" and "analogix_dp_unbind()"
>>>> "analogix_dp_suspned()" and "analogix_dp_resume()"
>>>> "analogix_dp_detect()" and "analogix_dp_get_modes()"
>>>>
>>>> The bind/unbind symbols is used for analogix platform driver to connect
>>>> with analogix_dp core driver. And the detect/get_modes is used for analogix
>>>> platform driver to init the connector.
>>>>
>>>> They reason why connector need register in helper driver is rockchip drm
>>>> haven't implement the atomic API, but Exynos drm have implement it, so
>>>> there would need two different connector helper functions, that's why we
>>>> leave the connector register in helper driver.
>>>>
>>>> Signed-off-by: Yakir Yang <ykk@rock-chips•com>
>>>> ---
>>> Marc reported that his Exynos5250 Snow Chromebook fails to boot with v4.7-rc.
>>>
>>> I've done a git bisect and tracked down to this commit. The problem is a NULL
>>> pointer dereference to connector->dev in drm_mode_create(connector->dev) when
>>> called from exynos_dp_get_modes(). The error log is at [1].
>>>
>>> I'm trying to figure out the issue but wanted to mention in case you have any
>>> hints about what could be the cause. AFAICT the problem is related to the fact
>>> that drm_connector_init() is called in analogix_dp_bridge_attach() and the
>>> connector passed as argument is the one in struct analogix_dp_device *dp, but
>>> later exynos_dp_get_modes() calls drm_mode_create() passing the connector in
>>> struct exynos_dp_device *dp, which has not been previously initialized.
>> Agree, this should be the problem, exynos_dp->connector haven't been
>> initialized, driver should make exynos_dp->dp to a connector point, and
>> record the passing connector in exynos_dp_bridge_attach(), that should
>> fix this problem.
>>
>>
>> Thanks,
>> - Yakir
>>
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_dp.c
>> b/drivers/gpu/drm/exynos/exynos_dp.c
>> index 468498e..4c1fb3f 100644
>> --- a/drivers/gpu/drm/exynos/exynos_dp.c
>> +++ b/drivers/gpu/drm/exynos/exynos_dp.c
>> @@ -34,7 +34,7 @@
>>
>> struct exynos_dp_device {
>> struct drm_encoder encoder;
>> - struct drm_connector connector;
>> + struct drm_connector *connector;
>> struct drm_bridge *ptn_bridge;
>> struct drm_device *drm_dev;
>> struct device *dev;
>> @@ -70,7 +70,7 @@ static int exynos_dp_poweroff(struct
>> analogix_dp_plat_data *plat_data)
>> static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data)
>> {
>> struct exynos_dp_device *dp = to_dp(plat_data);
>> - struct drm_connector *connector = &dp->connector;
>> + struct drm_connector *connector = dp->connector;
>> struct drm_display_mode *mode;
>> int num_modes = 0;
>>
>> @@ -103,6 +103,7 @@ static int exynos_dp_bridge_attach(struct
>> analogix_dp_plat_data *plat_data,
>> int ret;
>>
>> drm_connector_register(connector);
>> + dp->connector = connector;
>>
>> /* Pre-empt DP connector creation if there's a bridge */
>> if (dp->ptn_bridge) {
>>
> I've just tested this change, and in combination with Javier's DT patch,
> my Snow is back to its useful state (I'm writing this email from that
> very Chromebook).
>
> Once you make this a proper patch, please add my:
>
> Tested-by: Marc Zyngier <marc.zyngier@arm•com>
I guess Javier should be the best one to create this patch, if he have
no time, i would do it for him. thanks for your report ;)
- Yakir
> to it.
>
> Thanks a lot to you and Javier for tracking this down!
>
> M.
next prev parent reply other threads:[~2016-06-08 10:53 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-15 11:08 [PATCH v14 0/17] Add Analogix Core Display Port Driver Yakir Yang
2016-02-15 11:09 ` [PATCH v14 02/17] drm/exynos: dp: rename implementation specific driver part Yakir Yang
2016-02-15 11:09 ` [PATCH v14 03/17] drm: bridge: analogix/dp: rename register constants Yakir Yang
2016-02-15 11:09 ` [PATCH v14 04/17] drm: bridge: analogix/dp: fix some obvious code style Yakir Yang
2016-03-17 21:48 ` Heiko Stübner
2016-03-17 21:50 ` [PATCH v14.1 " Heiko Stübner
2016-02-15 11:10 ` [PATCH v14 05/17] drm: bridge: analogix/dp: remove duplicate configuration of link rate and link count Yakir Yang
2016-02-15 11:10 ` [PATCH v14 06/17] drm: bridge: analogix/dp: dynamic parse sync_pol & interlace & dynamic_range Yakir Yang
2016-02-15 11:10 ` [PATCH v14 07/17] dt-bindings: add document for analogix display port driver Yakir Yang
2016-02-15 11:10 ` [PATCH v14 08/17] ARM: dts: exynos/dp: remove some properties that deprecated by analogix_dp driver Yakir Yang
2016-02-15 11:10 ` [PATCH v14 09/17] drm: rockchip: dp: add rockchip platform dp driver Yakir Yang
2016-03-17 21:51 ` [PATCH v14.1 " Heiko Stübner
2016-03-18 6:45 ` Caesar Wang
2016-03-23 1:08 ` [PATCH v14 " Mark yao
2016-02-15 11:10 ` [PATCH v14 10/17] dt-bindings: add document for rockchip variant of analogix_dp Yakir Yang
2016-02-15 11:10 ` [PATCH v14 11/17] drm: bridge: analogix/dp: add some rk3288 special registers setting Yakir Yang
2016-03-18 6:56 ` Caesar Wang
2016-02-15 11:11 ` [PATCH v14 12/17] drm: bridge: analogix/dp: add max link rate and lane count limit for RK3288 Yakir Yang
2016-02-15 11:11 ` [PATCH v14 13/17] drm: bridge: analogix/dp: try force hpd after plug in lookup failed Yakir Yang
2016-02-15 11:11 ` [PATCH v14 14/17] drm: bridge: analogix/dp: move hpd detect to connector detect function Yakir Yang
2016-02-15 11:11 ` [PATCH v14 15/17] drm: bridge: analogix/dp: add edid modes parse in get_modes method Yakir Yang
2016-02-15 11:11 ` [PATCH v14 16/17] drm: bridge: analogix/dp: add panel prepare/unprepare in suspend/resume time Yakir Yang
2016-02-15 11:11 ` [PATCH v14 17/17] drm: bridge: analogix/dp: Fix the possible dead lock in bridge disable time Yakir Yang
2016-03-18 6:41 ` [PATCH v14 0/17] Add Analogix Core Display Port Driver Caesar Wang
2016-03-18 22:53 ` Doug Anderson
2016-03-22 19:19 ` Javier Martinez Canillas
2016-03-22 22:12 ` Who is going to merge it [Was: Re: [PATCH v14 0/17] Add Analogix Core Display Port Driver] Heiko Stübner
2016-03-22 22:44 ` Inki Dae
2016-03-22 22:52 ` Heiko Stübner
2016-03-22 23:09 ` Inki Dae
2016-03-22 23:39 ` Russell King - ARM Linux
2016-03-22 23:54 ` Inki Dae
2016-03-23 0:08 ` Russell King - ARM Linux
2016-03-23 0:41 ` Dave Airlie
2016-03-23 1:08 ` Mark yao
2016-03-23 15:49 ` Thierry Reding
2016-03-24 11:10 ` Yakir Yang
2016-03-24 13:01 ` [PATCH v14 0/17] Add Analogix Core Display Port Driver Heiko Stübner
[not found] ` <1455534576-1486-1-git-send-email-ykk@rock-chips.com>
2016-03-30 20:32 ` [v14, 01/17] drm: bridge: analogix/dp: split exynos dp driver to bridge directory Guenter Roeck
2016-03-31 9:56 ` Thierry Reding
2016-03-31 16:02 ` Doug Anderson
2016-04-05 2:15 ` Yakir Yang
2016-03-31 15:57 ` Doug Anderson
2016-04-05 1:49 ` Yakir Yang
[not found] ` <1811552.qvsCm7GUs1@diego>
2016-06-07 17:06 ` [PATCH v14.1 " Javier Martinez Canillas
2016-06-08 1:28 ` Yakir Yang
2016-06-08 7:44 ` Marc Zyngier
2016-06-08 10:53 ` Yakir Yang [this message]
2016-06-08 14:19 ` Javier Martinez Canillas
2016-03-31 10:15 ` [PATCH v14 0/17] Add Analogix Core Display Port Driver Daniel Vetter
2016-03-31 10:22 ` Thierry Reding
2016-04-05 2:06 ` Yakir Yang
2016-07-29 8:38 ` Tomeu Vizoso
2016-08-01 1:49 ` Yakir Yang
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