media: aspeed: Allow to capture from SoC display (GFX)

ASPEED BMC IC has 2 different display engines. Please find AST2600's
datasheet to get detailed information.

1. VGA on PCIe
2. SoC Display (GFX)

By default, video engine (VE) will capture video from VGA. This patch
adds an option to capture video from GFX with standard ioctl,
vidioc_s_input.

An enum, aspeed_video_input, is added for this purpose.
enum aspeed_video_input {
VIDEO_INPUT_VGA = 0,
VIDEO_INPUT_GFX,
VIDEO_INPUT_MAX
};

To test this feature, you will need to enable GFX first. Please refer to
ASPEED's SDK_User_Guide, 6.3.x Soc Display driver, for more information.
In your application, you will need to use v4l2 ioctl, VIDIOC_S_INPUT, as
below to select before start streaming.

int rc;
struct v4l2_input input;

input.index = VIDEO_INPUT_GFX;
rc = ioctl(fd, VIDIOC_S_INPUT, &input);
if (rc < 0)
{
...
}

Link: https://github.com/AspeedTech-BMC/openbmc/releases
Signed-off-by: Jammy Huang <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>
[hverkuil: split up three overly long lines]

drivers/media/platform/aspeed/aspeed-video.c

···
 
 #include <linux/atomic.h>
 #include <linux/bitfield.h>
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
···
 #include <linux/workqueue.h>
 #include <linux/debugfs.h>
 #include <linux/ktime.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-device.h>
···
 #define VE_MEM_RESTRICT_START		0x310
 #define VE_MEM_RESTRICT_END		0x314
 
+/* SCU's registers */
+#define SCU_MISC_CTRL			0xC0
+#define  SCU_DPLL_SOURCE		BIT(20)
+
+/* GFX's registers */
+#define GFX_CTRL			0x60
+#define  GFX_CTRL_ENABLE		BIT(0)
+#define  GFX_CTRL_FMT			GENMASK(9, 7)
+
+#define GFX_H_DISPLAY			0x70
+#define  GFX_H_DISPLAY_DE		GENMASK(28, 16)
+#define  GFX_H_DISPLAY_TOTAL		GENMASK(12, 0)
+
+#define GFX_V_DISPLAY			0x78
+#define  GFX_V_DISPLAY_DE		GENMASK(27, 16)
+#define  GFX_V_DISPLAY_TOTAL		GENMASK(11, 0)
+
+#define GFX_DISPLAY_ADDR		0x80
+
 /*
  * VIDEO_MODE_DETECT_DONE:	a flag raised if signal lock
  * VIDEO_RES_CHANGE:		a flag raised if res_change work on-going
···
 /*
  * struct aspeed_video - driver data
  *
+ * version:		holds the version of aspeed SoC
  * res_work:		holds the delayed_work for res-detection if unlock
  * buffers:		holds the list of buffer queued from user
  * flags:		holds the state of video
···
  * yuv420:		a flag raised if JPEG subsampling is 420
  * format:		holds the video format
  * hq_mode:		a flag raised if HQ is enabled. Only for VIDEO_FMT_ASPEED
+ * input:		holds the video input
  * frame_rate:		holds the frame_rate
  * jpeg_quality:	holds jpeq's quality (0~11)
  * jpeg_hq_quality:	holds hq's quality (1~12) only if hq_mode enabled
···
 	struct video_device vdev;
 	struct mutex video_lock;	/* v4l2 and videobuf2 lock */
 
+	struct regmap *scu;
+	struct regmap *gfx;
+	u32 version;
 	u32 jpeg_mode;
 	u32 comp_size_read;
 
···
 	bool yuv420;
 	enum aspeed_video_format format;
 	bool hq_mode;
+	enum aspeed_video_input input;
 	unsigned int frame_rate;
 	unsigned int jpeg_quality;
 	unsigned int jpeg_hq_quality;
···
 #define to_aspeed_video(x) container_of((x), struct aspeed_video, v4l2_dev)
 
 struct aspeed_video_config {
+	u32 version;
 	u32 jpeg_mode;
 	u32 comp_size_read;
 };
 
 static const struct aspeed_video_config ast2400_config = {
+	.version = 4,
 	.jpeg_mode = AST2400_VE_SEQ_CTRL_JPEG_MODE,
 	.comp_size_read = AST2400_VE_COMP_SIZE_READ_BACK,
 };
 
 static const struct aspeed_video_config ast2500_config = {
+	.version = 5,
 	.jpeg_mode = AST2500_VE_SEQ_CTRL_JPEG_MODE,
 	.comp_size_read = AST2400_VE_COMP_SIZE_READ_BACK,
 };
 
 static const struct aspeed_video_config ast2600_config = {
+	.version = 6,
 	.jpeg_mode = AST2500_VE_SEQ_CTRL_JPEG_MODE,
 	.comp_size_read = AST2600_VE_COMP_SIZE_READ_BACK,
 };
···
 
 static const char * const format_str[] = {"Standard JPEG",
 	"Aspeed JPEG"};
+static const char * const input_str[] = {"HOST VGA", "BMC GFX"};
 
 static unsigned int debug;
 
···
 			 &video->bcd.dma, video->bcd.size);
 	} else if (!bcd_buf_need && video->bcd.size) {
 		aspeed_video_free_buf(video, &video->bcd);
+	}
+
+	if (video->input == VIDEO_INPUT_GFX) {
+		u32 val;
+
+		// update input buffer address as gfx's
+		regmap_read(video->gfx, GFX_DISPLAY_ADDR, &val);
+		aspeed_video_write(video, VE_TGS_0, val);
 	}
 
 	spin_lock_irqsave(&video->lock, flags);
···
 	}
 }
 
+static void aspeed_video_get_resolution_gfx(struct aspeed_video *video,
+					    struct v4l2_bt_timings *det)
+{
+	u32 h_val, v_val;
+
+	regmap_read(video->gfx, GFX_H_DISPLAY, &h_val);
+	regmap_read(video->gfx, GFX_V_DISPLAY, &v_val);
+
+	det->width = FIELD_GET(GFX_H_DISPLAY_DE, h_val) + 1;
+	det->height = FIELD_GET(GFX_V_DISPLAY_DE, v_val) + 1;
+	video->v4l2_input_status = 0;
+}
+
 #define res_check(v) test_and_clear_bit(VIDEO_MODE_DETECT_DONE, &(v)->flags)
 
-static void aspeed_video_get_resolution(struct aspeed_video *video)
+static void aspeed_video_get_resolution_vga(struct aspeed_video *video,
+					    struct v4l2_bt_timings *det)
 {
 	bool invalid_resolution = true;
 	int rc;
···
 	u32 mds;
 	u32 src_lr_edge;
 	u32 src_tb_edge;
-	struct v4l2_bt_timings *det = &video->detected_timings;
 
 	det->width = MIN_WIDTH;
 	det->height = MIN_HEIGHT;
···
 
 	aspeed_video_get_timings(video, det);
 
-	/*
-	 * Enable mode-detect watchdog, resolution-change watchdog and
-	 * automatic compression after frame capture.
-	 */
+	/* Enable mode-detect watchdog, resolution-change watchdog */
 	aspeed_video_update(video, VE_INTERRUPT_CTRL, 0,
 			    VE_INTERRUPT_MODE_DETECT_WD);
-	aspeed_video_update(video, VE_SEQ_CTRL, 0,
-			    VE_SEQ_CTRL_AUTO_COMP | VE_SEQ_CTRL_EN_WATCHDOG);
+	aspeed_video_update(video, VE_SEQ_CTRL, 0, VE_SEQ_CTRL_EN_WATCHDOG);
+}
+
+static void aspeed_video_get_resolution(struct aspeed_video *video)
+{
+	struct v4l2_bt_timings *det = &video->detected_timings;
+
+	if (video->input == VIDEO_INPUT_GFX)
+		aspeed_video_get_resolution_gfx(video, det);
+	else
+		aspeed_video_get_resolution_vga(video, det);
 
 	v4l2_dbg(1, debug, &video->v4l2_dev, "Got resolution: %dx%d\n",
 		 det->width, det->height);
···
 	aspeed_video_write(video, VE_SRC_SCANLINE_OFFSET, act->width * 4);
 
 	/* Don't use direct mode below 1024 x 768 (irqs don't fire) */
-	if (size < DIRECT_FETCH_THRESHOLD) {
+	if (video->input == VIDEO_INPUT_VGA && size < DIRECT_FETCH_THRESHOLD) {
 		v4l2_dbg(1, debug, &video->v4l2_dev, "Capture: Sync Mode\n");
 		aspeed_video_write(video, VE_TGS_0,
 				   FIELD_PREP(VE_TGS_FIRST,
···
 				    VE_CTRL_INT_DE | VE_CTRL_DIRECT_FETCH,
 				    VE_CTRL_INT_DE);
 	} else {
+		u32 ctrl, val, bpp;
+
 		v4l2_dbg(1, debug, &video->v4l2_dev, "Capture: Direct Mode\n");
+		ctrl = VE_CTRL_DIRECT_FETCH;
+		if (video->input == VIDEO_INPUT_GFX) {
+			regmap_read(video->gfx, GFX_CTRL, &val);
+			bpp = FIELD_GET(GFX_CTRL_FMT, val) ? 32 : 16;
+			if (bpp == 16)
+				ctrl |= VE_CTRL_INT_DE;
+			aspeed_video_write(video, VE_TGS_1, act->width * (bpp >> 3));
+		}
 		aspeed_video_update(video, VE_CTRL,
 				    VE_CTRL_INT_DE | VE_CTRL_DIRECT_FETCH,
-				    VE_CTRL_DIRECT_FETCH);
+				    ctrl);
 	}
 
 	size *= 4;
···
 		aspeed_video_free_buf(video, &video->srcs[0]);
 }
 
+/*
+ * Update relative parameters when timing changed.
+ *
+ * @video: the struct of aspeed_video
+ * @timings: the new timings
+ */
+static void aspeed_video_update_timings(struct aspeed_video *video, struct v4l2_bt_timings *timings)
+{
+	video->active_timings = *timings;
+	aspeed_video_set_resolution(video);
+
+	video->pix_fmt.width = timings->width;
+	video->pix_fmt.height = timings->height;
+	video->pix_fmt.sizeimage = video->max_compressed_size;
+}
+
 static void aspeed_video_update_regs(struct aspeed_video *video)
 {
 	u8 jpeg_hq_quality = clamp((int)video->jpeg_hq_quality - 1, 0,
···
 	u32 ctrl = 0;
 	u32 seq_ctrl = 0;
 
+	v4l2_dbg(1, debug, &video->v4l2_dev, "input(%s)\n",
+		 input_str[video->input]);
 	v4l2_dbg(1, debug, &video->v4l2_dev, "framerate(%d)\n",
 		 video->frame_rate);
 	v4l2_dbg(1, debug, &video->v4l2_dev, "jpeg format(%s) subsample(%s)\n",
···
 		aspeed_video_update(video, VE_BCD_CTRL, 0, VE_BCD_CTRL_EN_BCD);
 	else
 		aspeed_video_update(video, VE_BCD_CTRL, VE_BCD_CTRL_EN_BCD, 0);
+
+	if (video->input == VIDEO_INPUT_VGA)
+		ctrl |= VE_CTRL_AUTO_OR_CURSOR;
 
 	if (video->frame_rate)
 		ctrl |= FIELD_PREP(VE_CTRL_FRC, video->frame_rate);
···
 	aspeed_video_update(video, VE_SEQ_CTRL,
 			    video->jpeg_mode | VE_SEQ_CTRL_YUV420,
 			    seq_ctrl);
-	aspeed_video_update(video, VE_CTRL, VE_CTRL_FRC, ctrl);
+	aspeed_video_update(video, VE_CTRL,
+			    VE_CTRL_FRC | VE_CTRL_AUTO_OR_CURSOR |
+			    VE_CTRL_SOURCE, ctrl);
 	aspeed_video_update(video, VE_COMP_CTRL,
 			    VE_COMP_CTRL_DCT_LUM | VE_COMP_CTRL_DCT_CHR |
 			    VE_COMP_CTRL_EN_HQ | VE_COMP_CTRL_HQ_DCT_LUM |
···
 	aspeed_video_write(video, VE_JPEG_ADDR, video->jpeg.dma);
 
 	/* Set control registers */
+	aspeed_video_write(video, VE_SEQ_CTRL, VE_SEQ_CTRL_AUTO_COMP);
 	aspeed_video_write(video, VE_CTRL, ctrl);
 	aspeed_video_write(video, VE_COMP_CTRL, VE_COMP_CTRL_RSVD);
 
···
 	aspeed_video_get_resolution(video);
 
 	/* Set timings since the device is being opened for the first time */
-	video->active_timings = video->detected_timings;
-	aspeed_video_set_resolution(video);
-
-	video->pix_fmt.width = video->active_timings.width;
-	video->pix_fmt.height = video->active_timings.height;
-	video->pix_fmt.sizeimage = video->max_compressed_size;
+	aspeed_video_update_timings(video, &video->detected_timings);
 }
 
 static void aspeed_video_stop(struct aspeed_video *video)
···
 {
 	struct aspeed_video *video = video_drvdata(file);
 
-	if (inp->index)
+	if (inp->index >= VIDEO_INPUT_MAX)
 		return -EINVAL;
 
-	strscpy(inp->name, "Host VGA capture", sizeof(inp->name));
+	sprintf(inp->name, "%s capture", input_str[inp->index]);
 	inp->type = V4L2_INPUT_TYPE_CAMERA;
 	inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;
 	inp->status = video->v4l2_input_status;
···
 
 static int aspeed_video_get_input(struct file *file, void *fh, unsigned int *i)
 {
-	*i = 0;
+	struct aspeed_video *video = video_drvdata(file);
+
+	*i = video->input;
 
 	return 0;
 }
 
 static int aspeed_video_set_input(struct file *file, void *fh, unsigned int i)
 {
-	if (i)
+	struct aspeed_video *video = video_drvdata(file);
+
+	if (i >= VIDEO_INPUT_MAX)
 		return -EINVAL;
+
+	if (i == video->input)
+		return 0;
+
+	if (vb2_is_busy(&video->queue))
+		return -EBUSY;
+
+	if (IS_ERR(video->scu)) {
+		v4l2_dbg(1, debug, &video->v4l2_dev,
+			 "%s: scu isn't ready for input-control\n", __func__);
+		return -EINVAL;
+	}
+
+	if (IS_ERR(video->gfx) && i == VIDEO_INPUT_GFX) {
+		v4l2_dbg(1, debug, &video->v4l2_dev,
+			 "%s: gfx isn't ready for GFX input\n", __func__);
+		return -EINVAL;
+	}
+
+	video->input = i;
+
+	if (video->version == 6) {
+		/* modify dpll source per current input */
+		if (video->input == VIDEO_INPUT_VGA)
+			regmap_update_bits(video->scu, SCU_MISC_CTRL,
+					   SCU_DPLL_SOURCE, 0);
+		else
+			regmap_update_bits(video->scu, SCU_MISC_CTRL,
+					   SCU_DPLL_SOURCE, SCU_DPLL_SOURCE);
+	}
+
+	aspeed_video_update_regs(video);
+
+	/* update signal status */
+	aspeed_video_get_resolution(video);
+	if (!video->v4l2_input_status)
+		aspeed_video_update_timings(video, &video->detected_timings);
 
 	return 0;
 }
···
 	if (vb2_is_busy(&video->queue))
 		return -EBUSY;
 
-	video->active_timings = timings->bt;
-
-	aspeed_video_set_resolution(video);
-
-	video->pix_fmt.width = timings->bt.width;
-	video->pix_fmt.height = timings->bt.height;
-	video->pix_fmt.sizeimage = video->max_compressed_size;
+	aspeed_video_update_timings(video, &timings->bt);
 
 	timings->type = V4L2_DV_BT_656_1120;
 
···
 	val08 = aspeed_video_read(v, VE_CTRL);
 	if (FIELD_GET(VE_CTRL_DIRECT_FETCH, val08)) {
 		seq_printf(s, "  %-20s:\tDirect fetch\n", "Mode");
+		seq_printf(s, "  %-20s:\t%s\n", "Input", input_str[v->input]);
 		seq_printf(s, "  %-20s:\t%s\n", "VGA bpp mode",
 			   FIELD_GET(VE_CTRL_INT_DE, val08) ? "16" : "32");
 	} else {
···
 	return 0;
 }
 
+/*
+ * Get regmap without checking res, such as clk/reset, that could lead to
+ * conflict.
+ */
+static struct regmap *aspeed_regmap_lookup(struct device_node *np, const char *property)
+{
+	struct device_node *syscon_np __free(device_node) = of_parse_phandle(np, property, 0);
+
+	if (!syscon_np)
+		return ERR_PTR(-ENODEV);
+
+	return device_node_to_regmap(syscon_np);
+}
+
 static int aspeed_video_init(struct aspeed_video *video)
 {
 	int irq;
 	int rc;
 	struct device *dev = video->dev;
+
+	video->scu = aspeed_regmap_lookup(dev->of_node, "aspeed,scu");
+	video->gfx = aspeed_regmap_lookup(dev->of_node, "aspeed,gfx");
 
 	irq = irq_of_parse_and_map(dev->of_node, 0);
 	if (!irq) {
···
 	if (!config)
 		return -ENODEV;
 
+	video->version = config->version;
 	video->jpeg_mode = config->jpeg_mode;
 	video->comp_size_read = config->comp_size_read;
 

include/uapi/linux/aspeed-video.h

···
 
 #include <linux/v4l2-controls.h>
 
+/* aspeed video's input types */
+enum aspeed_video_input {
+	VIDEO_INPUT_VGA = 0,
+	VIDEO_INPUT_GFX,
+	VIDEO_INPUT_MAX
+};
+
 #define V4L2_CID_ASPEED_HQ_MODE			(V4L2_CID_USER_ASPEED_BASE  + 1)
 #define V4L2_CID_ASPEED_HQ_JPEG_QUALITY		(V4L2_CID_USER_ASPEED_BASE  + 2)