https://github.com/torvalds/linux
Revision 1aeef303b5d9e243c41d5b80f8bb059366514a10 authored by Liu Gang on 22 November 2013, 08:12:40 UTC, committed by Linus Walleij on 03 December 2013, 12:10:48 UTC
For MPC8572/MPC8536, the status of GPIOs defined as output cannot be determined by reading GPDAT register, so the code use shadow data register instead. But the code may give the wrong status of GPIOs defined as input under some scenarios: 1. If some pins were configured as inputs and were asserted high before booting the kernel, the shadow data has been initialized with those pin values. 2. Some pins have been configured as output first and have been set to the high value, then reconfigured as input. The above cases will make the shadow data for those input pins to be set to high. Then reading the pin status will always return high even if the actual pin status is low. The code should eliminate the effects of the shadow data to the input pins, and the status of those pins should be read directly from GPDAT. Cc: stable@vger.kernel.org Acked-by: Scott Wood <scottwood@freescale.com> Acked-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Liu Gang <Gang.Liu@freescale.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 parent 35c5d7f
Tip revision: 1aeef303b5d9e243c41d5b80f8bb059366514a10 authored by Liu Gang on 22 November 2013, 08:12:40 UTC
powerpc/gpio: Fix the wrong GPIO input data on MPC8572/MPC8536
powerpc/gpio: Fix the wrong GPIO input data on MPC8572/MPC8536
Tip revision: 1aeef30
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