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authorArchit Taneja <architt@codeaurora.org>2017-10-06 13:57:06 +0300
committerRob Clark <robdclark@gmail.com>2017-10-12 19:59:46 +0300
commita18a0ea0096833ecb52053b183fcf9709f7bafd8 (patch)
tree5804f0ebbd69fb338679ca2c78cc18fc23d5e88a /drivers/gpu
parentc9811d0fa55929b182f62e0ee49b71b0bea6a936 (diff)
downloadlinux-a18a0ea0096833ecb52053b183fcf9709f7bafd8.tar.xz
drm/msm/dsi: Use correct pm_runtime_put variant during host_init
The DSI runtime PM suspend/resume callbacks check whether msm_host->cfg_hnd is non-NULL before trying to enable the bus clocks. This is done to accommodate early calls to these functions that may happen before the bus clocks are even initialized. Calling pm_runtime_put_autosuspend() in dsi_host_init() can result in racy behaviour since msm_host->cfg_hnd is set very soon after. If the suspend callback happens too late, we end up trying to disable clocks that were never enabled, resulting in a bunch of WARN_ON splats. Use pm_runtime_put_sync() so that the suspend callback is called immediately. Reported-by: Nicolas Dechesne <nicolas.dechesne@linaro.org> Signed-off-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/msm/dsi/dsi_host.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index dbb31a014419..deaf869374ea 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -248,7 +248,7 @@ disable_clks:
clk_disable_unprepare(ahb_clk);
disable_gdsc:
regulator_disable(gdsc_reg);
- pm_runtime_put_autosuspend(dev);
+ pm_runtime_put_sync(dev);
put_clk:
clk_put(ahb_clk);
put_gdsc: