Commit a23cb3b5 authored Jul 27, 2017 by Jordan Crouse Committed by Rob Clark Aug 01, 2017

drm/msm: Turn off hardware clock gating before reading A5XX registers



On A5XX GPU hardware clock gating needs to be turned off before
reading certain GPU registers via AHB. Turn off HWCG before calling
adreno_show() to safely dump all the registers without a system hang.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

parent 6e749e59

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -995,7 +995,14 @@ static void a5xx_show(struct msm_gpu gpu, struct seq_file m)
		{
		seq_printf(m, "status: %08x\n",
		gpu_read(gpu, REG_A5XX_RBBM_STATUS));

		/*
		* Temporarily disable hardware clock gating before going into
		* adreno_show to avoid issues while reading the registers
		*/
		a5xx_set_hwcg(gpu, false);
		adreno_show(gpu, m);
		a5xx_set_hwcg(gpu, true);
		}
		#endif