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Commit 2e4652fd authored by Sharat Masetty's avatar Sharat Masetty
Browse files

drm/msm: Set memory retention flags on the GPU core clock 



After enabling the GPU clocks, the GPU can pagefault
when trying to access memory(example the ringbuffer).
This patch addresses the pagefault issue by enabling
the memory retention flags on the GPU core clock.

Change-Id: Ibabecba77501d6a3b188b19c90c172de7d667c8c
Signed-off-by: default avatarSharat Masetty <smasetty@codeaurora.org>
parent 486b948c

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

+18 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include "msm_iommu.h"

#include "msm_trace.h"

#include "a5xx_gpu.h"

#include <linux/clk/msm-clk.h>



#define SECURE_VA_START 0xc0000000

#define SECURE_VA_SIZE  SZ_256M
@@ -1169,6 +1170,17 @@ static int a5xx_pm_resume(struct msm_gpu *gpu) 
{

	int ret;



	/*

	 * Between suspend/resumes the GPU clocks need to be turned off

	 * but not a complete power down, typically between frames. Set the

	 * memory retention flags on the GPU core clock to retain memory

	 * across clock toggles.

	 */

	if (gpu->core_clk) {

		clk_set_flags(gpu->core_clk, CLKFLAG_RETAIN_PERIPH);

		clk_set_flags(gpu->core_clk, CLKFLAG_RETAIN_MEM);

	}



	/* Turn on the core power */

	ret = msm_gpu_pm_resume(gpu);

	if (ret)
@@ -1208,6 +1220,12 @@ static int a5xx_pm_suspend(struct msm_gpu *gpu) 
{

	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);



	/* Turn off the memory retention flag when not necessary */

	if (gpu->core_clk) {

		clk_set_flags(gpu->core_clk, CLKFLAG_NORETAIN_PERIPH);

		clk_set_flags(gpu->core_clk, CLKFLAG_NORETAIN_MEM);

	}



	/* Only do this next bit if we are about to go down */

	if (gpu->active_cnt == 1) {

		/* Clear the VBIF pipe before shutting down */