media: venus: core,pm: Add handling for resets

The Venus driver has to control two reset signals related to
gcc video_axi0 and videocc mvs0c for v6. Add it.
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/qcom/venus/core.h

@@ -24,6 +24,7 @@
 #define VIDC_CLKS_NUM_MAX		4
 #define VIDC_VCODEC_CLKS_NUM_MAX	2
 #define VIDC_PMDOMAINS_NUM_MAX		3
+#define VIDC_RESETS_NUM_MAX		2
 
 extern int venus_fw_debug;
 
@@ -64,6 +65,8 @@ struct venus_resources {
 	unsigned int vcodec_pmdomains_num;
 	const char **opp_pmdomain;
 	unsigned int vcodec_num;
+	const char * const resets[VIDC_RESETS_NUM_MAX];
+	unsigned int resets_num;
 	enum hfi_version hfi_version;
 	u32 max_load;
 	unsigned int vmem_id;
@@ -130,6 +133,7 @@ struct venus_core {
 	struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
 	struct device_link *opp_dl_venus;
 	struct device *opp_pmdomain;
+	struct reset_control *resets[VIDC_RESETS_NUM_MAX];
 	struct video_device *vdev_dec;
 	struct video_device *vdev_enc;
 	struct v4l2_device v4l2_dev;

drivers/media/platform/qcom/venus/pm_helpers.c

@@ -11,6 +11,7 @@
 #include <linux/pm_domain.h>
 #include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/types.h>
 #include <media/v4l2-mem2mem.h>
 
@@ -847,6 +848,52 @@ static void vcodec_domains_put(struct venus_core *core)
 	dev_pm_opp_detach_genpd(core->opp_table);
 }
 
+static int core_resets_reset(struct venus_core *core)
+{
+	const struct venus_resources *res = core->res;
+	unsigned char i;
+	int ret;
+
+	if (!res->resets_num)
+		return 0;
+
+	for (i = 0; i < res->resets_num; i++) {
+		ret = reset_control_assert(core->resets[i]);
+		if (ret)
+			goto err;
+
+		usleep_range(150, 250);
+		ret = reset_control_deassert(core->resets[i]);
+		if (ret)
+			goto err;
+	}
+
+err:
+	return ret;
+}
+
+static int core_resets_get(struct venus_core *core)
+{
+	struct device *dev = core->dev;
+	const struct venus_resources *res = core->res;
+	unsigned char i;
+	int ret;
+
+	if (!res->resets_num)
+		return 0;
+
+	for (i = 0; i < res->resets_num; i++) {
+		core->resets[i] =
+			devm_reset_control_get_exclusive(dev, res->resets[i]);
+		if (IS_ERR(core->resets[i])) {
+			ret = PTR_ERR(core->resets[i]);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static int core_get_v4(struct venus_core *core)
 {
 	struct device *dev = core->dev;
@@ -870,6 +917,10 @@ static int core_get_v4(struct venus_core *core)
 	if (ret)
 		return ret;
 
+	ret = core_resets_get(core);
+	if (ret)
+		return ret;
+
 	if (legacy_binding)
 		return 0;
 
@@ -929,6 +980,13 @@ static int core_power_v4(struct venus_core *core, int on)
 			}
 		}
 
+		ret = core_resets_reset(core);
+		if (ret) {
+			if (pmctrl)
+				pm_runtime_put_sync(pmctrl);
+			return ret;
+		}
+
 		ret = core_clks_enable(core);
 		if (ret < 0 && pmctrl)
 			pm_runtime_put_sync(pmctrl);
@@ -939,6 +997,8 @@ static int core_power_v4(struct venus_core *core, int on)
 
 		core_clks_disable(core);
 
+		ret = core_resets_reset(core);
+
 		if (pmctrl)
 			pm_runtime_put_sync(pmctrl);
 	}