[PATCH v4 5/7] drm/msm/a6xx: Ensure CX collapse during gpu recovery

[Akhil P Oommen <quic_akhilpo@quicinc.com>]

Because there could be transient votes from other drivers/tz/hyp which
may keep the cx gdsc enabled, we should poll until cx gdsc collapses.
We can use the reset framework to poll for cx gdsc collapse from gpucc
clk driver.

This feature requires support from the platform's gpucc driver.

Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---

(no changes since v3)

Changes in v3:
- Use reset interface from gpucc driver to poll for cx gdsc collapse
  https://patchwork.freedesktop.org/series/106860/

 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ++++
 drivers/gpu/drm/msm/msm_gpu.c         | 4 ++++
 drivers/gpu/drm/msm/msm_gpu.h         | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 0c8f19e..0ec4fcd 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -10,6 +10,7 @@
 
 #include <linux/bitfield.h>
 #include <linux/devfreq.h>
+#include <linux/reset.h>
 #include <linux/soc/qcom/llcc-qcom.h>
 
 #define GPU_PAS_ID 13
@@ -1229,6 +1230,9 @@ static void a6xx_recover(struct msm_gpu *gpu)
 	/* And the final one from recover worker */
 	pm_runtime_put_sync(&gpu->pdev->dev);
 
+	/* Call into gpucc driver to poll for cx gdsc collapse */
+	reset_control_reset(gpu->cx_collapse);
+
 	pm_runtime_use_autosuspend(&gpu->pdev->dev);
 
 	if (active_submits)
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 07e55a6..4a57627 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -14,6 +14,7 @@
 #include <generated/utsrelease.h>
 #include <linux/string_helpers.h>
 #include <linux/devcoredump.h>
+#include <linux/reset.h>
 #include <linux/sched/task.h>
 
 /*
@@ -903,6 +904,9 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	if (IS_ERR(gpu->gpu_cx))
 		gpu->gpu_cx = NULL;
 
+	gpu->cx_collapse = devm_reset_control_get_optional(&pdev->dev,
+			"cx_collapse");
+
 	gpu->pdev = pdev;
 	platform_set_drvdata(pdev, &gpu->adreno_smmu);
 
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 6def008..ab59fd2 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -13,6 +13,7 @@
 #include <linux/interconnect.h>
 #include <linux/pm_opp.h>
 #include <linux/regulator/consumer.h>
+#include <linux/reset.h>
 
 #include "msm_drv.h"
 #include "msm_fence.h"
@@ -268,6 +269,9 @@ struct msm_gpu {
 	bool hw_apriv;
 
 	struct thermal_cooling_device *cooling;
+
+	/* To poll for cx gdsc collapse during gpu recovery */
+	struct reset_control *cx_collapse;
 };
 
 static inline struct msm_gpu *dev_to_gpu(struct device *dev)
-- 
2.7.4