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STM32 OTG HS DEV (in FS mode): Disable ULPI clock enable in RCC AHB1 Register. If Both ULPI and the FS clock enable bits are set in FS mode, then the ARM never awakens froom WFI due to a chip issue. From Ken Pettit

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This commit is contained in:
Gregory Nutt 2014-12-13 07:44:13 -06:00
parent a1e05721d8
commit 002d4c40a4
1 changed files with 10 additions and 0 deletions
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10
arch/arm/src/stm32/stm32_otghsdev.c
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@ -5309,6 +5309,16 @@ static void stm32_hwinitialize(FAR struct stm32_usbdev_s *priv)
stm32_putreg(0xbfffffff, STM32_OTGHS_GINTSTS);
/* Disable the ULPI Clock enable in RCC AHB1 Register. This must
* be done because if both the ULPI and the FS PHY clock enable bits
* are set at the same time, the ARM never awakens from WFI due to
* some bug / errata in the chip.
*/
regval = stm32_getreg(STM32_RCC_AHB1LPENR);
regval &= ~RCC_AHB1ENR_OTGHSULPIEN;
stm32_putreg(regval, STM32_RCC_AHB1LPENR);
/* Enable the interrupts in the INTMSK */
regval = (OTGHS_GINT_RXFLVL | OTGHS_GINT_USBSUSP | OTGHS_GINT_ENUMDNE |