media: mtk-vpu: dump VPU status when IPI times out

when IPI time out, dump VPU status to get more debug information
Signed-off-by: Irui Wang <irui.wang@mediatek.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-vpu/mtk_vpu.c

@@ -61,6 +61,8 @@
 #define VPU_IDLE_REG		0x002C
 #define VPU_INT_STATUS		0x0034
 #define VPU_PC_REG		0x0060
+#define VPU_SP_REG		0x0064
+#define VPU_RA_REG		0x0068
 #define VPU_WDT_REG		0x0084
 
 /* vpu inter-processor communication interrupt */
@@ -268,6 +270,20 @@ static int vpu_clock_enable(struct mtk_vpu *vpu)
 	return ret;
 }
 
+static void vpu_dump_status(struct mtk_vpu *vpu)
+{
+	dev_info(vpu->dev,
+		 "vpu: run %x, pc = 0x%x, ra = 0x%x, sp = 0x%x, idle = 0x%x\n"
+		 "vpu: int %x, hv = 0x%x, vh = 0x%x, wdt = 0x%x\n",
+		 vpu_running(vpu), vpu_cfg_readl(vpu, VPU_PC_REG),
+		 vpu_cfg_readl(vpu, VPU_RA_REG), vpu_cfg_readl(vpu, VPU_SP_REG),
+		 vpu_cfg_readl(vpu, VPU_IDLE_REG),
+		 vpu_cfg_readl(vpu, VPU_INT_STATUS),
+		 vpu_cfg_readl(vpu, HOST_TO_VPU),
+		 vpu_cfg_readl(vpu, VPU_TO_HOST),
+		 vpu_cfg_readl(vpu, VPU_WDT_REG));
+}
+
 int vpu_ipi_register(struct platform_device *pdev,
 		     enum ipi_id id, ipi_handler_t handler,
 		     const char *name, void *priv)
@@ -328,6 +344,7 @@ int vpu_ipi_send(struct platform_device *pdev,
 		if (time_after(jiffies, timeout)) {
 			dev_err(vpu->dev, "vpu_ipi_send: IPI timeout!\n");
 			ret = -EIO;
+			vpu_dump_status(vpu);
 			goto mut_unlock;
 		}
 	} while (vpu_cfg_readl(vpu, HOST_TO_VPU));
@@ -347,8 +364,9 @@ int vpu_ipi_send(struct platform_device *pdev,
 	ret = wait_event_timeout(vpu->ack_wq, vpu->ipi_id_ack[id], timeout);
 	vpu->ipi_id_ack[id] = false;
 	if (ret == 0) {
-		dev_err(vpu->dev, "vpu ipi %d ack time out !", id);
+		dev_err(vpu->dev, "vpu ipi %d ack time out !\n", id);
 		ret = -EIO;
+		vpu_dump_status(vpu);
 		goto clock_disable;
 	}
 	vpu_clock_disable(vpu);
@@ -633,7 +651,7 @@ static ssize_t vpu_debug_read(struct file *file, char __user *user_buf,
 {
 	char buf[256];
 	unsigned int len;
-	unsigned int running, pc, vpu_to_host, host_to_vpu, wdt;
+	unsigned int running, pc, vpu_to_host, host_to_vpu, wdt, idle, ra, sp;
 	int ret;
 	struct device *dev = file->private_data;
 	struct mtk_vpu *vpu = dev_get_drvdata(dev);
@@ -650,6 +668,10 @@ static ssize_t vpu_debug_read(struct file *file, char __user *user_buf,
 	wdt = vpu_cfg_readl(vpu, VPU_WDT_REG);
 	host_to_vpu = vpu_cfg_readl(vpu, HOST_TO_VPU);
 	vpu_to_host = vpu_cfg_readl(vpu, VPU_TO_HOST);
+	ra = vpu_cfg_readl(vpu, VPU_RA_REG);
+	sp = vpu_cfg_readl(vpu, VPU_SP_REG);
+	idle = vpu_cfg_readl(vpu, VPU_IDLE_REG);
+
 	vpu_clock_disable(vpu);
 
 	if (running) {
@@ -658,9 +680,12 @@ static ssize_t vpu_debug_read(struct file *file, char __user *user_buf,
 		"PC: 0x%x\n"
 		"WDT: 0x%x\n"
 		"Host to VPU: 0x%x\n"
-		"VPU to Host: 0x%x\n",
+		"VPU to Host: 0x%x\n"
+		"SP: 0x%x\n"
+		"RA: 0x%x\n"
+		"idle: 0x%x\n",
 		vpu->run.fw_ver, pc, wdt,
-		host_to_vpu, vpu_to_host);
+		host_to_vpu, vpu_to_host, sp, ra, idle);
 	} else {
 		len = snprintf(buf, sizeof(buf), "VPU not running\n");
 	}