On the imx8 MIPI DSI oled board, MIPI panel and touch share one RST
pin. when suspend the whole system, touch will suspend first, it
disable touch irq, and let touch work in sleep mode. Then MIPI panel
suspend, it will give a reset signal on the RST pin. Due to this reset
signal, touch will trigger two interrupt on GPIO1_9. Because touch
suspend code already disable touch irq, so these two new touch interrupt
will be pending there, and pending there in GPIO forever.
When system resume, GPIO will restore registers in runtime resume before
synaptics_dsx_i2c touch driver resume, so the GPIO1_9 IRQ will be unmasked
and since its IRQ is pending there so IRQ keeps coming without touch
driver to handle it, since it is NOT resume yet, make the system can't
resueme back normally.
Due to this is the hardware limitation which cause this issue, I format this
patch to workaround this issue.
This patch free touch irq in the touch driver suspend procedure, rather than
just disable the touch irq.
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
(cherry picked from commit a157605b47e2c3800d706b3ca0af24e26c92c187)
TODO: checkpatch warnings
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
d7ed12c616