Commit 8f3eea9d authored Aug 20, 2021 by Lucas Stach

drm/etnaviv: keep MMU context across runtime suspend/resume



The MMU state may be kept across a runtime suspend/resume cycle, as we
avoid a full hardware reset to keep the latency of the runtime PM small.

Don't pretend that the MMU state is lost in driver state. The MMU
context is pushed out when new HW jobs with a different context are
coming in. The only exception to this is when the GPU is unbound, in
which case we need to make sure to also free the last active context.

Cc: stable@vger.kernel.org # 5.4
Reported-by: Michael Walle <michael@walle.cc>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Michael Walle <michael@walle.cc>
Tested-by: Marek Vasut <marex@denx.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

parent 23e0f5a5

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -1596,9 +1596,6 @@ static int etnaviv_gpu_hw_suspend(struct etnaviv_gpu *gpu)
		*/
		etnaviv_gpu_wait_idle(gpu, 100);

		etnaviv_iommu_context_put(gpu->mmu_context);
		gpu->mmu_context = NULL;

		gpu->fe_running = false;
		}

		@@ -1747,6 +1744,9 @@ static void etnaviv_gpu_unbind(struct device dev, struct device master,
		etnaviv_gpu_hw_suspend(gpu);
		#endif

		if (gpu->mmu_context)
		etnaviv_iommu_context_put(gpu->mmu_context);

		if (gpu->initialized) {
		etnaviv_cmdbuf_free(&gpu->buffer);
		etnaviv_iommu_global_fini(gpu);