media: imx: imx7_mipi_csis: Count the CSI-2 debug interrupts

In addition to the main interrupts that flag errors and other events,
the CSI-2 receiver has debug interrupt sources that flag various events
useful for debugging. Add those sources to the event counter mechanism
and print them when debugging is enabled.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/imx/imx7-mipi-csis.c

@@ -195,6 +195,24 @@
 
 /* Debug control register */
 #define MIPI_CSIS_DBG_CTRL			0xc0
+#define MIPI_CSIS_DBG_INTR_MSK			0xc4
+#define MIPI_CSIS_DBG_INTR_MSK_DT_NOT_SUPPORT	BIT(25)
+#define MIPI_CSIS_DBG_INTR_MSK_DT_IGNORE	BIT(24)
+#define MIPI_CSIS_DBG_INTR_MSK_ERR_FRAME_SIZE	BIT(20)
+#define MIPI_CSIS_DBG_INTR_MSK_TRUNCATED_FRAME	BIT(16)
+#define MIPI_CSIS_DBG_INTR_MSK_EARLY_FE		BIT(12)
+#define MIPI_CSIS_DBG_INTR_MSK_EARLY_FS		BIT(8)
+#define MIPI_CSIS_DBG_INTR_MSK_CAM_VSYNC_FALL	BIT(4)
+#define MIPI_CSIS_DBG_INTR_MSK_CAM_VSYNC_RISE	BIT(0)
+#define MIPI_CSIS_DBG_INTR_SRC			0xc8
+#define MIPI_CSIS_DBG_INTR_SRC_DT_NOT_SUPPORT	BIT(25)
+#define MIPI_CSIS_DBG_INTR_SRC_DT_IGNORE	BIT(24)
+#define MIPI_CSIS_DBG_INTR_SRC_ERR_FRAME_SIZE	BIT(20)
+#define MIPI_CSIS_DBG_INTR_SRC_TRUNCATED_FRAME	BIT(16)
+#define MIPI_CSIS_DBG_INTR_SRC_EARLY_FE		BIT(12)
+#define MIPI_CSIS_DBG_INTR_SRC_EARLY_FS		BIT(8)
+#define MIPI_CSIS_DBG_INTR_SRC_CAM_VSYNC_FALL	BIT(4)
+#define MIPI_CSIS_DBG_INTR_SRC_CAM_VSYNC_RISE	BIT(0)
 
 /* Non-image packet data buffers */
 #define MIPI_CSIS_PKTDATA_ODD			0x2000
@@ -210,6 +228,7 @@ enum {
 };
 
 struct mipi_csis_event {
+	bool debug;
 	u32 mask;
 	const char * const name;
 	unsigned int counter;
@@ -217,22 +236,30 @@ struct mipi_csis_event {
 
 static const struct mipi_csis_event mipi_csis_events[] = {
 	/* Errors */
-	{ MIPI_CSIS_INT_SRC_ERR_SOT_HS,		"SOT Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_LOST_FS,	"Lost Frame Start Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_LOST_FE,	"Lost Frame End Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_OVER,		"FIFO Overflow Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_WRONG_CFG,	"Wrong Configuration Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_ECC,		"ECC Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_CRC,		"CRC Error" },
-	{ MIPI_CSIS_INT_SRC_ERR_UNKNOWN,	"Unknown Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_SOT_HS,		"SOT Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_LOST_FS,		"Lost Frame Start Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_LOST_FE,		"Lost Frame End Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_OVER,		"FIFO Overflow Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_WRONG_CFG,	"Wrong Configuration Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_ECC,		"ECC Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_CRC,		"CRC Error" },
+	{ false, MIPI_CSIS_INT_SRC_ERR_UNKNOWN,		"Unknown Error" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_DT_NOT_SUPPORT,	"Data Type Not Supported" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_DT_IGNORE,	"Data Type Ignored" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_ERR_FRAME_SIZE,	"Frame Size Error" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_TRUNCATED_FRAME,	"Truncated Frame" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_EARLY_FE,	"Early Frame End" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_EARLY_FS,	"Early Frame Start" },
 	/* Non-image data receive events */
-	{ MIPI_CSIS_INT_SRC_EVEN_BEFORE,	"Non-image data before even frame" },
-	{ MIPI_CSIS_INT_SRC_EVEN_AFTER,		"Non-image data after even frame" },
-	{ MIPI_CSIS_INT_SRC_ODD_BEFORE,		"Non-image data before odd frame" },
-	{ MIPI_CSIS_INT_SRC_ODD_AFTER,		"Non-image data after odd frame" },
+	{ false, MIPI_CSIS_INT_SRC_EVEN_BEFORE,		"Non-image data before even frame" },
+	{ false, MIPI_CSIS_INT_SRC_EVEN_AFTER,		"Non-image data after even frame" },
+	{ false, MIPI_CSIS_INT_SRC_ODD_BEFORE,		"Non-image data before odd frame" },
+	{ false, MIPI_CSIS_INT_SRC_ODD_AFTER,		"Non-image data after odd frame" },
 	/* Frame start/end */
-	{ MIPI_CSIS_INT_SRC_FRAME_START,	"Frame Start" },
-	{ MIPI_CSIS_INT_SRC_FRAME_END,		"Frame End" },
+	{ false, MIPI_CSIS_INT_SRC_FRAME_START,		"Frame Start" },
+	{ false, MIPI_CSIS_INT_SRC_FRAME_END,		"Frame End" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_CAM_VSYNC_FALL,	"VSYNC Falling Edge" },
+	{ true, MIPI_CSIS_DBG_INTR_SRC_CAM_VSYNC_RISE,	"VSYNC Rising Edge" },
 };
 
 #define MIPI_CSIS_NUM_EVENTS ARRAY_SIZE(mipi_csis_events)
@@ -455,6 +482,7 @@ static const struct csis_pix_format *find_csis_format(u32 code)
 static void mipi_csis_enable_interrupts(struct csi_state *state, bool on)
 {
 	mipi_csis_write(state, MIPI_CSIS_INT_MSK, on ? 0xffffffff : 0);
+	mipi_csis_write(state, MIPI_CSIS_DBG_INTR_MSK, on ? 0xffffffff : 0);
 }
 
 static void mipi_csis_sw_reset(struct csi_state *state)
@@ -667,7 +695,7 @@ static void mipi_csis_clear_counters(struct csi_state *state)
 static void mipi_csis_log_counters(struct csi_state *state, bool non_errors)
 {
 	unsigned int num_events = non_errors ? MIPI_CSIS_NUM_EVENTS
-				: MIPI_CSIS_NUM_EVENTS - 6;
+				: MIPI_CSIS_NUM_EVENTS - 8;
 	struct device *dev = &state->pdev->dev;
 	unsigned long flags;
 	unsigned int i;
@@ -962,22 +990,27 @@ static irqreturn_t mipi_csis_irq_handler(int irq, void *dev_id)
 	unsigned long flags;
 	unsigned int i;
 	u32 status;
+	u32 dbg_status;
 
 	status = mipi_csis_read(state, MIPI_CSIS_INT_SRC);
+	dbg_status = mipi_csis_read(state, MIPI_CSIS_DBG_INTR_SRC);
 
 	spin_lock_irqsave(&state->slock, flags);
 
 	/* Update the event/error counters */
 	if ((status & MIPI_CSIS_INT_SRC_ERRORS) || state->debug) {
 		for (i = 0; i < MIPI_CSIS_NUM_EVENTS; i++) {
-			if (!(status & state->events[i].mask))
-				continue;
-			state->events[i].counter++;
+			struct mipi_csis_event *event = &state->events[i];
+
+			if ((!event->debug && (status & event->mask)) ||
+			    (event->debug && (dbg_status & event->mask)))
+				event->counter++;
 		}
 	}
 	spin_unlock_irqrestore(&state->slock, flags);
 
 	mipi_csis_write(state, MIPI_CSIS_INT_SRC, status);
+	mipi_csis_write(state, MIPI_CSIS_DBG_INTR_SRC, dbg_status);
 
 	return IRQ_HANDLED;
 }