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1288d70208
[Why] There is a race condition between x86 and dmcub fw when attempting to exit IPS2. Scenarios including exiting IPS2 before IPS2 has been entered. This can cause unexpected hang when DMCUB attempt to exit while PMFW still tries to enter IPS2. [How] A new design has been introduced to remove race conditions and improve the handshake between x86 and DMCUB. An AON scratch register is borrowed from PMFW to determine whether DMCUB has committed to IPS entry or not. In the case when dmcub has committed IPS entry, x86 must poll until an exit event occurred either from DMCUB(IPS1) or PMFW(IPS2). x86 will wait upperbound of evaluation and IPS entry time to ensure IPS2 exit event has been sent to PMFW. Reviewed-by: Charlene Liu <charlene.liu@amd.com> Acked-by: Wayne Lin <wayne.lin@amd.com> Signed-off-by: Duncan Ma <duncan.ma@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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| .. | ||
| dce60 | ||
| dce100 | ||
| dce110 | ||
| dce112 | ||
| dce120 | ||
| dcn10 | ||
| dcn20 | ||
| dcn21 | ||
| dcn30 | ||
| dcn31 | ||
| dcn32 | ||
| dcn35 | ||
| dcn201 | ||
| dcn301 | ||
| dcn314 | ||
| dcn315 | ||
| dcn316 | ||
| clk_mgr.c | ||
| Makefile | ||