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fw/qmod: enable modem RESET by default at boot

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When the uC firmware starts, assert the (high-active) _RESET GPIOs,
which will cause the transistors to drive the mPCIe slot !PERST
low.

There is of course a short instance of time between the uC reset
until it executes wwan_perst_init(). To avoid this, a hardware
pull-up would have to be re-worked onto the _RESET[1..4] signals
on the PCBA

Change-Id: I8742fefa4bf02e728e34d5d8cbc0fda771e78ffb
This commit is contained in:
Harald Welte
2020-01-09 20:31:06 +01:00
parent 9292d22726
commit eb8fbc0296
1 changed files with 2 additions and 2 deletions
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4
firmware/libboard/qmod/include/board.h
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@@ -91,8 +91,8 @@
#define PINS_WWAN_IN { PIN_WWAN1, PIN_WWAN2 }
/* outputs controlling RESET input of modems */
#define PIN_PERST1 {PIO_PA25, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_PULLUP}
#define PIN_PERST2 {PIO_PA26, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_PULLUP}
#define PIN_PERST1 {PIO_PA25, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_PULLUP}
#define PIN_PERST2 {PIO_PA26, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_PULLUP}
#define PINS_PERST { PIN_PERST1, PIN_PERST2 }
#define PIN_VERSION_DET {PIO_PA19, PIOA, ID_PIOA, PIO_PERIPH_D, PIO_DEFAULT}