sdm32h7: enable sdmmc hardware flow control
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commit a74ee4c04fa62810976ba73fdaf492fd080f4199 Author: Aidan MacDonald <[email protected]> Date: Wed Jan 21 13:54:30 2026 +0000 sdm32h7: enable sdmmc hardware flow control Hardware flow control prevents FIFO underruns/overruns by stopping the bus clock if one would occur. This can slow down transfers, but that's better than having data transfer fail due to AXI/AHB bus contention. Change-Id: I8696d3aff78c17dbbe85907160fa37fd4ee11e85 diff --git a/firmware/target/arm/stm32/sdmmc-stm32h7.c b/firmware/target/arm/stm32/sdmmc-stm32h7.c index 0bb0c323f9..8ec64a7d1d 100644 --- a/firmware/target/arm/stm32/sdmmc-stm32h7.c +++ b/firmware/target/arm/stm32/sdmmc-stm32h7.c @@ -121,7 +121,7 @@ void stm32h7_sdmmc_set_power_enabled(void *controller, bool enabled) udelay(200); /* Automatically stop clock when bus is not in use */ - reg_writelf(ctl->regs, SDMMC_CLKCR, PWRSAV(1)); + reg_writelf(ctl->regs, SDMMC_CLKCR, PWRSAV(1), HWFC_EN(1)); } else { -- rockbox-cvs mailing list [email protected] https://lists.haxx.se/mailman/listinfo/rockbox-cvs