void dmub_dcn20_reset(struct dmub_srv *dmub)
{
+ union dmub_gpint_data_register cmd;
+ const uint32_t timeout = 30;
+ uint32_t in_reset, scratch, i;
+
+ REG_GET(DMCUB_CNTL, DMCUB_SOFT_RESET, &in_reset);
+
+ if (in_reset == 0) {
+ cmd.bits.status = 1;
+ cmd.bits.command_code = DMUB_GPINT__STOP_FW;
+ cmd.bits.param = 0;
+
+ dmub->hw_funcs.set_gpint(dmub, cmd);
+
+ /**
+ * Timeout covers both the ACK and the wait
+ * for remaining work to finish.
+ *
+ * This is mostly bound by the PHY disable sequence.
+ * Each register check will be greater than 1us, so
+ * don't bother using udelay.
+ */
+
+ for (i = 0; i < timeout; ++i) {
+ if (dmub->hw_funcs.is_gpint_acked(dmub, cmd))
+ break;
+ }
+
+ for (i = 0; i < timeout; ++i) {
+ scratch = dmub->hw_funcs.get_gpint_response(dmub);
+ if (scratch == DMUB_GPINT__STOP_FW_RESPONSE)
+ break;
+ }
+
+ /* Force reset in case we timed out, DMCUB is likely hung. */
+ }
+
REG_UPDATE(DMCUB_CNTL, DMCUB_SOFT_RESET, 1);
REG_UPDATE(DMCUB_CNTL, DMCUB_ENABLE, 0);
REG_UPDATE(MMHUBBUB_SOFT_RESET, DMUIF_SOFT_RESET, 1);