> From: Ye Li <[email protected]> > Update the mx7ulp wdog disable sequence to avoid potential reset > issue in unlock or refresh sequence. Both sequence need two words > write to wdog CNT register in 16 bus clocks window, if miss the > window, the write will cause violation in wdog and reset the chip. > Current u-boot code is using writel() function which has a DMB > barrier to order the memory access. The DMB between two words write > may introduce some delay in certain circumstance, causing the wdog > reset due to 16 bus clock window requirement. > Also, WDOG1 might have been enabled already depending on FUSE hence > we need to be as close as possible to its reconfiguration timing > requirement of 128 bus clock limit. > This patch replaces writel() function by __raw_writel() to avoid such > issue, and improve to check if watchdog is already disabled or > unlocked. > Signed-off-by: Ye Li <[email protected]> > Co-developed-by: Jorge Ramirez-Ortiz <[email protected]> > Signed-off-by: Jorge Ramirez-Ortiz <[email protected]> > Co-developed-by: Ricardo Salveti <[email protected]> > Signed-off-by: Ricardo Salveti <[email protected]> > Signed-off-by: Oleksandr Suvorov <[email protected]> Applied to u-boot-imx, master, thanks !
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