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Fri, 30 Dec 2016 09:58:31 +0000 (GMT) From: Marek Szyprowski To: dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org Cc: Marek Szyprowski , Inki Dae , Archit Taneja , Yakir Yang , Sean Paul , Bartlomiej Zolnierkiewicz , Daniel Vetter , David Airlie Subject: [PATCH] drm/bridge: analogix dp: Fix runtime PM state on driver bind Date: Fri, 30 Dec 2016 10:57:46 +0100 Message-id: <1483091866-1088-1-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrJIsWRmVeSWpSXmKPExsWy7djPc7rH9dMiDKZ8trLoPXeSyaKp4y2r xcYZ61kt/m+byGxx5et7NotJ9yewWMw4v4/JYu2Ru+wWdzecZbQ41zCZ3YHLY3bDRRaPy329 TB57vy1g8dj+7QGrx/3u40wef2ftZ/Ho27KK0ePzJrkAjigum5TUnMyy1CJ9uwSujLkTO9kL pspU9C9qY25gfCPRxcjBISFgIvFvonkXIyeQKSZx4d56ti5GLg4hgaWMEs/P/WWFcD4zShzu OckGUWUisXr7MUaIxDJGiSdtd1ggnAYmiXNt95hAqtgEDCW63naBdYgIuEk0HZ4JNopZYA+T ROeBVhaQhLCAv8SpLSvAbBYBVYnfdx+CNfMKuEv8+L6ABWKdnMTJY5NZIexmdol3e9wg7paV 2HSAGSLsIrHpzTooW1ji1fEt7BC2jMTlyd1QY/oZJZpatSHsGYwS597yQtjWEoePXwQbzyzA JzFp23RmiPG8Eh1tQhAlHhIL926FGuko8WEaxFohgViJFUu3sE5glF7AyLCKUSS1tDg3PbXY VK84Mbe4NC9dLzk/dxMjMMJP/zv+dQfj0mNWhxgFOBiVeHh/lKVGCLEmlhVX5h5ilOBgVhLh NdBLixDiTUmsrEotyo8vKs1JLT7EKM3BoiTOu2fBlXAhgfTEktTs1NSC1CKYLBMHp1QDo9nX GdtnxPJ+OHG3+JOuQ9Zn+Vl+eVUp5m0nr/5SXXrezmvJnI9+7dPb5u5mUGv6f8lncXfutYj5 25awu8zW/i3nkraFO3sNn9Oj4/4sx2LTA3Q+ep7Lu/tAe2c2t9H6mwfi2lfqtXzRmcZecZBx u/juxfrHnay23Er3l1uiZRl86pGFiIWotBJLcUaioRZzUXEiAF4zi3HsAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrPLMWRmVeSWpSXmKPExsVy+t/xa7q79dMiDC7dYbLoPXeSyaKp4y2r xcYZ61kt/m+byGxx5et7NotJ9yewWMw4v4/JYu2Ru+wWdzecZbQ41zCZ3YHLY3bDRRaPy329 TB57vy1g8dj+7QGrx/3u40wef2ftZ/Ho27KK0ePzJrkAjig3m4zUxJTUIoXUvOT8lMy8dFul 0BA3XQslhbzE3FRbpQhd35AgJYWyxJxSIM/IAA04OAe4Byvp2yW4Zcyd2MleMFWmon9RG3MD 4xuJLkZODgkBE4nV248xQthiEhfurWfrYuTiEBJYwihxtGUWE4TTxCSx8/EJVpAqNgFDia63 XWwgtoiAm0TT4ZlgcWaBPUwSvd8jQWxhAV+Jx7euMYPYLAKqEr/vPmQCsXkF3CV+fF/AArFN TuLkscmsExi5FzAyrGIUSS0tzk3PLTbSK07MLS7NS9dLzs/dxAgM7G3Hfm7Zwdj1LvgQowAH oxIP74KS1Agh1sSy4srcQ4wSHMxKIrwGemkRQrwpiZVVqUX58UWlOanFhxhNgZZPZJYSTc4H Rl1eSbyhiaG5paGRsYWFuZGRkjjv1A9XwoUE0hNLUrNTUwtSi2D6mDg4pRoYj+5+Lv88ckFc Eq81zxaHz9WbT7Cuj78dvLCN49183/aVW7pubL1UefPs4rUr1EX1b6aIZJn8LxA9s90tNzKC v8z0E1f7499fAvNOuN0LDM2dIWD9ZPKfOVPuZQqueGjwLSKg1z7M2CDk0F2vrpJNN85Hll85 nLHWraK1c8uNSxzzz7M+/1SpoMRSnJFoqMVcVJwIAKE/J8KCAgAA X-MTR: 20000000000000000@CPGS X-CMS-MailID: 20161230095831eucas1p2c315f7ca20a49e1a7ad421cc68b1101a X-Msg-Generator: CA X-Sender-IP: 182.198.249.180 X-Local-Sender: =?UTF-8?B?TWFyZWsgU3p5cHJvd3NraRtTUlBPTC1LZXJuZWwgKFRQKRs=?= =?UTF-8?B?7IK87ISx7KCE7J6QG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Global-Sender: =?UTF-8?B?TWFyZWsgU3p5cHJvd3NraRtTUlBPTC1LZXJuZWwgKFRQKRtT?= =?UTF-8?B?YW1zdW5nIEVsZWN0cm9uaWNzG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Sender-Code: =?UTF-8?B?QzEwG0VIURtDMTBDRDAyQ0QwMjczOTI=?= CMS-TYPE: 201P X-HopCount: 7 X-CMS-RootMailID: 20161230095831eucas1p2c315f7ca20a49e1a7ad421cc68b1101a X-RootMTR: 20161230095831eucas1p2c315f7ca20a49e1a7ad421cc68b1101a References: Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Analogix_dp_bind() can be called from component framework, which doesn't guarantee proper runtime PM state of the device during bind operation, so ensure that device is runtime active before doing any register access. This ensures that the power domain, to which DP module belongs, is turned on. While at it, also fix the unbalanced call to phy_power_on() in analogix_dp_bind() function. This patch solves the following kernel oops on Samsung Exynos5250 Snow board: Unhandled fault: imprecise external abort (0x406) at 0x00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: : 406 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 75 Comm: kworker/0:2 Not tainted 4.9.0 #1046 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) Workqueue: events deferred_probe_work_func task: ee272300 task.stack: ee312000 PC is at analogix_dp_enable_sw_function+0x18/0x2c LR is at analogix_dp_init_dp+0x2c/0x50 ... [] (analogix_dp_enable_sw_function) from [] (analogix_dp_init_dp+0x2c/0x50) [] (analogix_dp_init_dp) from [] (analogix_dp_bind+0x184/0x42c) [] (analogix_dp_bind) from [] (component_bind_all+0xf0/0x218) [] (component_bind_all) from [] (exynos_drm_load+0x134/0x200) [] (exynos_drm_load) from [] (drm_dev_register+0xa0/0xd0) [] (drm_dev_register) from [] (drm_platform_init+0x58/0xb0) [] (drm_platform_init) from [] (try_to_bring_up_master+0x14c/0x188) [] (try_to_bring_up_master) from [] (component_add+0x88/0x138) [] (component_add) from [] (platform_drv_probe+0x50/0xb0) [] (platform_drv_probe) from [] (driver_probe_device+0x1f0/0x2a8) [] (driver_probe_device) from [] (bus_for_each_drv+0x44/0x8c) [] (bus_for_each_drv) from [] (__device_attach+0x9c/0x100) [] (__device_attach) from [] (bus_probe_device+0x84/0x8c) [] (bus_probe_device) from [] (deferred_probe_work_func+0x60/0x8c) [] (deferred_probe_work_func) from [] (process_one_work+0x120/0x318) [] (process_one_work) from [] (process_scheduled_works+0x28/0x38) [] (process_scheduled_works) from [] (worker_thread+0x204/0x4ac) [] (worker_thread) from [] (kthread+0xd8/0xf4) [] (kthread) from [] (ret_from_fork+0x14/0x3c) Code: e59035f0 e5935018 f57ff04f e3c55001 (f57ff04e) ---[ end trace 3d1d0d87796de344 ]--- Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 7 +++++++ 1 file changed, 7 insertions(+) -- 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 diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index eb9bf8786c24..18eefdcbf1ba 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -1382,6 +1382,7 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev, pm_runtime_enable(dev); + pm_runtime_get_sync(dev); phy_power_on(dp->phy); analogix_dp_init_dp(dp); @@ -1414,9 +1415,15 @@ int analogix_dp_bind(struct device *dev, struct drm_device *drm_dev, goto err_disable_pm_runtime; } + phy_power_off(dp->phy); + pm_runtime_put(dev); + return 0; err_disable_pm_runtime: + + phy_power_off(dp->phy); + pm_runtime_put(dev); pm_runtime_disable(dev); return ret;