drm/msm/dsi: do not enable irq handler before powering up the host

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The DSI host might be left in some state by the bootloader. If this
state generates an IRQ, it might hang the system by holding the
interrupt line before the driver sets up the DSI host to the known
state.

Move the request_irq into msm_dsi_host_init and pass IRQF_NO_AUTOEN to
it. Call enable/disable_irq after msm_dsi_host_power_on/_off()
functions, so that we can be sure that the interrupt is delivered when
the host is in the known state.

It is not possible to defer the interrupt enablement to a later point,
because drm_panel_prepare might need to communicate with the panel over
the DSI link and that requires working interrupt.

Fixes: a689554ba6 ("drm/msm: Initial add DSI connector support")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Link: https://lore.kernel.org/r/20211002010830.647416-1-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

...

This commit is contained in:

Dmitry Baryshkov 2021-10-02 04:08:30 +03:00 • committed by Rob Clark

parent fb25d4474f

commit bf94ec093d

3 changed files with 49 additions and 17 deletions

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2

drivers/gpu/drm/msm/dsi/dsi.h

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48

drivers/gpu/drm/msm/dsi/dsi_host.c

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16

drivers/gpu/drm/msm/dsi/dsi_manager.c

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