diff options
Diffstat (limited to 'plat/imx/imx8mq/gpc.c')
| -rw-r--r-- | plat/imx/imx8mq/gpc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/plat/imx/imx8mq/gpc.c b/plat/imx/imx8mq/gpc.c index 4daa89eb..a094bd65 100644 --- a/plat/imx/imx8mq/gpc.c +++ b/plat/imx/imx8mq/gpc.c @@ -5,6 +5,7 @@ */ #include <debug.h> +#include <delay_timer.h> #include <stdlib.h> #include <stdint.h> #include <stdbool.h> @@ -644,6 +645,15 @@ void imx_gpc_init(void) val = mmio_read_32(0x30390024); val &= ~0x1; mmio_write_32(0x30390024, val); + + /* for USB OTG, the limitation are: + * 1. before system clock config, the IPG clock run at 12.5MHz, delay time + * should be longer than 82us. + * 2. after system clock config, ipg clock run at 66.5MHz, delay time + * be longer that 15.3 us. + * Add 100us to make sure the USB OTG SRC is clear safely. + */ + udelay(100); } int imx_gpc_handler(uint32_t smc_fid, |