mirror of
git://nv-tegra.nvidia.com/linux-nvgpu.git
synced 2025-12-23 18:16:01 +03:00
46a66efb0e
- Commitc61e21c868fixed race codition in PMU state transition. - The race condition is such that PMU response(intr callback for messages) can run faster than kthread posting commands to PMU and thus PMU message callback may skip important pmu state change. - Commitc61e21c868introduced a fix where PMU state change was only updated from callback while other places can only update pmu_state variable - However, this commit introduced a regression as follows: - When PMU state is PMU_STATE_INIT_RECEIVED, we loop over every engine supported by GPU --> If state = PMU_STATE_INIT_RECEIVED, change the state to PMU_STATE_ELPG_BOOTING and init ELPG else If state != PMU_STATE_INIT_RECEIVED throw an error saying "PMU INIT not received" - Now, if GPU supports multiple engines, first engine will check that pmu_state is PMU_STATE_INIT_RECEIVED and change it to PMU_STATE_ELPG_BOOTING However, from second engine onwards, since state is already changed to PMU_STATE_ELPG_BOOTING, all engines except first engine start throwing error "PMU INIT not received" - This patch fixes the issue by changing pmu state from PMU_STATE_INIT_RECEIVED to PMU_STATE_ELPG_BOOTING only once. Bug 200372838 JIRA EVLR-2164 Change-Id: Ic8c954d14acb1d6ec3adcbc4bcf4d4745542d9f0 Signed-off-by: Deepak Bhosale <dbhosale@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1769814 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Mahantesh Kumbar <mkumbar@nvidia.com> Reviewed-by: Deepak Goyal <dgoyal@nvidia.com> Reviewed-by: Aparna Das <aparnad@nvidia.com> Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>