Commit 44ad4fdc authored by Tomas Vanek's avatar Tomas Vanek Committed by Freddie Chopin
Browse files

jtag/drivers cmsis-dap: do not limit speed so strictly

Adapter clock frequency is set by 32-bit number and most adapters
limit the highest speed safely. There is no reason to impose strict
limit of 5000 kHz if some adapters can do more.

While on it give informative error message in case of zero adapter_khz.

Change-Id: I45c9804678e24496ea769ea9ca6036701b04dde9
Signed-off-by: default avatarTomas Vanek <>

Tested-by: jenkins
Reviewed-by: default avatarFreddie Chopin <>
parent 73a94649
......@@ -1499,13 +1499,11 @@ static int cmsis_dap_execute_queue(void)
static int cmsis_dap_speed(int speed)
if (speed > DAP_MAX_CLOCK) {
LOG_INFO("reduce speed request: %dkHz to %dkHz maximum", speed, DAP_MAX_CLOCK);
speed = DAP_MAX_CLOCK;
if (speed > DAP_MAX_CLOCK)
LOG_INFO("High speed (adapter_khz %d) may be limited by adapter firmware.", speed);
if (speed == 0) {
LOG_INFO("RTCK not supported");
LOG_ERROR("RTCK not supported. Set nonzero adapter_khz.");
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