[PATCH v5 0/4] media: camss: sm8250: Virtual channels support for SM8250

[PATCH v5 0/4] media: camss: sm8250: Virtual channels support for SM8250

[quic_mmitkov]

From: Milen Mitkov <quic_mmitkov@quicinc.com>

For v5:
- Use entity->use_count instead of s_stream subdev call ret code to
  check if another instance of the pipeline is running. Prevents an
  error on 6.1 and up, when stopping one of several simultaneous
  instances.
- flush buffers instead of just returning if the pipeline didn't start.

For v4:
- fixes the warning reported by the kernel test robot
- tiny code change to enable the vc functionality with the partially-applied
  multistream patches on linux-next (tested on tag:next-20221010)

For v3:
- setting the sink pad format on the CSID entity will now propagate the
  format to the source pads to keep the subdev in a valid internal state.
- code syntax improvements

For v2:
- code syntax improvements
- The info print for the enabled VCs was demoted to a dbg print. Can be
  enabled with dynamic debug, e.g.:
echo "file drivers/media/platform/qcom/camss/* +p" > /sys/kernel/debug/dynamic_debug/control

NOTE: These changes depend on the multistream series, that as of yet
is still not merged upstream. However, part of the
multistream patches are merged in linux-next (tested on
tag:next-20221010), including the patch that introduces the
video_device_pipeline_alloc_start() functionality. This allows 
applying and using this series on linux-next without applying the
complete multistream set.

The CSID hardware on SM8250 can demux the input data stream into
maximum of 4 multiple streams depending on virtual channel (vc)
or data type (dt) configuration.

Situations in which demuxing is useful:
- HDR sensors that produce a 2-frame HDR output, e.g. a light and a dark frame
  (the setup we used for testing, with the imx412 sensor),
  or a 3-frame HDR output - light, medium-lit, dark frame.
- sensors with additional metadata that is streamed over a different
  virtual channel/datatype.
- sensors that produce frames with multiple resolutions in the same pixel
  data stream

With these changes, the CSID entity has, as it did previously, a single
sink port (0), and always exposes 4 source ports (1, 2,3, 4). The
virtual channel configuration is determined by which of the source ports
are linked to an output VFE line. For example, the link below will
configure the CSID driver to enable vc 0 and vc 1:

media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'

which will be demuxed and propagated into /dev/video0
and /dev/video1 respectively. With this, the userspace can use
any normal V4L2 client app to start/stop/queue/dequeue from these
video nodes. Tested with the yavta app.

The format of each RDI channel of the used VFE(s) (msm_vfe0_rdi0,
msm_vfe0_rdi1,...) must also be configured explicitly.

Note that in order to keep a valid internal subdevice state,
setting the sink pad format of the CSID subdevice will propagate
this format to the source pads. However, since the CSID hardware
can demux the input stream into several streams each of which can 
be a different format, in that case each source pad's 
format must be set individually, e.g.:

media-ctl -V '"msm_csid0":1[fmt:SRGGB10/3840x2160]'
media-ctl -V '"msm_csid0":2[fmt:SRGGB10/960x540]'

Milen Mitkov (4):
  media: camss: sm8250: Virtual channels for CSID
  media: camss: vfe: Reserve VFE lines on stream start and link to CSID
  media: camss: vfe-480: Multiple outputs support for SM8250
  media: camss: sm8250: Pipeline starting and stopping for multiple
    virtual channels

 .../platform/qcom/camss/camss-csid-gen2.c     | 54 ++++++++++------
 .../media/platform/qcom/camss/camss-csid.c    | 44 +++++++++----
 .../media/platform/qcom/camss/camss-csid.h    | 11 +++-
 .../media/platform/qcom/camss/camss-vfe-480.c | 61 ++++++++++++-------
 drivers/media/platform/qcom/camss/camss-vfe.c |  1 +
 .../media/platform/qcom/camss/camss-video.c   | 21 ++++++-
 drivers/media/platform/qcom/camss/camss.c     |  2 +-
 7 files changed, 134 insertions(+), 60 deletions(-)

-- 
2.37.3

[PATCH v5 1/4] media: camss: sm8250: Virtual channels for CSID

[quic_mmitkov]

From: Milen Mitkov <quic_mmitkov@quicinc.com>

CSID hardware on SM8250 can demux up to 4 simultaneous streams
based on virtual channel (vc) or datatype (dt).
The CSID subdevice entity now has 4 source ports that can be
enabled/disabled and thus can control which virtual channels
are enabled. Datatype demuxing not tested.

In order to keep a valid internal state of the subdevice,
implicit format propagation from the sink to the source pads
has been preserved. However, the format on each source pad
can be different and in that case it must be configured explicitly.

CSID's s_stream is called when any stream is started or stopped.
It will call configure_streams() that will rewrite IRQ settings to HW.
When multiple streams are running simultaneously there is an issue
when writing IRQ settings for one stream while another is still
running, thus avoid re-writing settings if they were not changed
in link setup, or by fully powering off the CSID hardware.

Signed-off-by: Milen Mitkov <quic_mmitkov@quicinc.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Robert Foss <robert.foss@linaro.org>
---
 .../platform/qcom/camss/camss-csid-gen2.c     | 54 ++++++++++++-------
 .../media/platform/qcom/camss/camss-csid.c    | 44 ++++++++++-----
 .../media/platform/qcom/camss/camss-csid.h    | 11 +++-
 3 files changed, 74 insertions(+), 35 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-csid-gen2.c b/drivers/media/platform/qcom/camss/camss-csid-gen2.c
index 2031bde13a93..0f8ac29d038d 100644
--- a/drivers/media/platform/qcom/camss/camss-csid-gen2.c
+++ b/drivers/media/platform/qcom/camss/camss-csid-gen2.c
@@ -334,13 +334,14 @@ static const struct csid_format csid_formats[] = {
 	},
 };
 
-static void csid_configure_stream(struct csid_device *csid, u8 enable)
+static void __csid_configure_stream(struct csid_device *csid, u8 enable, u8 vc)
 {
 	struct csid_testgen_config *tg = &csid->testgen;
 	u32 val;
 	u32 phy_sel = 0;
 	u8 lane_cnt = csid->phy.lane_cnt;
-	struct v4l2_mbus_framefmt *input_format = &csid->fmt[MSM_CSID_PAD_SRC];
+	/* Source pads matching RDI channels on hardware. Pad 1 -> RDI0, Pad 2 -> RDI1, etc. */
+	struct v4l2_mbus_framefmt *input_format = &csid->fmt[MSM_CSID_PAD_FIRST_SRC + vc];
 	const struct csid_format *format = csid_get_fmt_entry(csid->formats, csid->nformats,
 							      input_format->code);
 
@@ -351,8 +352,7 @@ static void csid_configure_stream(struct csid_device *csid, u8 enable)
 		phy_sel = csid->phy.csiphy_id;
 
 	if (enable) {
-		u8 vc = 0; /* Virtual Channel 0 */
-		u8 dt_id = vc * 4;
+		u8 dt_id = vc;
 
 		if (tg->enabled) {
 			/* Config Test Generator */
@@ -395,42 +395,42 @@ static void csid_configure_stream(struct csid_device *csid, u8 enable)
 		val |= format->data_type << RDI_CFG0_DATA_TYPE;
 		val |= vc << RDI_CFG0_VIRTUAL_CHANNEL;
 		val |= dt_id << RDI_CFG0_DT_ID;
-		writel_relaxed(val, csid->base + CSID_RDI_CFG0(0));
+		writel_relaxed(val, csid->base + CSID_RDI_CFG0(vc));
 
 		/* CSID_TIMESTAMP_STB_POST_IRQ */
 		val = 2 << RDI_CFG1_TIMESTAMP_STB_SEL;
-		writel_relaxed(val, csid->base + CSID_RDI_CFG1(0));
+		writel_relaxed(val, csid->base + CSID_RDI_CFG1(vc));
 
 		val = 1;
-		writel_relaxed(val, csid->base + CSID_RDI_FRM_DROP_PERIOD(0));
+		writel_relaxed(val, csid->base + CSID_RDI_FRM_DROP_PERIOD(vc));
 
 		val = 0;
-		writel_relaxed(val, csid->base + CSID_RDI_FRM_DROP_PATTERN(0));
+		writel_relaxed(val, csid->base + CSID_RDI_FRM_DROP_PATTERN(vc));
 
 		val = 1;
-		writel_relaxed(val, csid->base + CSID_RDI_IRQ_SUBSAMPLE_PERIOD(0));
+		writel_relaxed(val, csid->base + CSID_RDI_IRQ_SUBSAMPLE_PERIOD(vc));
 
 		val = 0;
-		writel_relaxed(val, csid->base + CSID_RDI_IRQ_SUBSAMPLE_PATTERN(0));
+		writel_relaxed(val, csid->base + CSID_RDI_IRQ_SUBSAMPLE_PATTERN(vc));
 
 		val = 1;
-		writel_relaxed(val, csid->base + CSID_RDI_RPP_PIX_DROP_PERIOD(0));
+		writel_relaxed(val, csid->base + CSID_RDI_RPP_PIX_DROP_PERIOD(vc));
 
 		val = 0;
-		writel_relaxed(val, csid->base + CSID_RDI_RPP_PIX_DROP_PATTERN(0));
+		writel_relaxed(val, csid->base + CSID_RDI_RPP_PIX_DROP_PATTERN(vc));
 
 		val = 1;
-		writel_relaxed(val, csid->base + CSID_RDI_RPP_LINE_DROP_PERIOD(0));
+		writel_relaxed(val, csid->base + CSID_RDI_RPP_LINE_DROP_PERIOD(vc));
 
 		val = 0;
-		writel_relaxed(val, csid->base + CSID_RDI_RPP_LINE_DROP_PATTERN(0));
+		writel_relaxed(val, csid->base + CSID_RDI_RPP_LINE_DROP_PATTERN(vc));
 
 		val = 0;
-		writel_relaxed(val, csid->base + CSID_RDI_CTRL(0));
+		writel_relaxed(val, csid->base + CSID_RDI_CTRL(vc));
 
-		val = readl_relaxed(csid->base + CSID_RDI_CFG0(0));
+		val = readl_relaxed(csid->base + CSID_RDI_CFG0(vc));
 		val |=  1 << RDI_CFG0_ENABLE;
-		writel_relaxed(val, csid->base + CSID_RDI_CFG0(0));
+		writel_relaxed(val, csid->base + CSID_RDI_CFG0(vc));
 	}
 
 	if (tg->enabled) {
@@ -456,7 +456,16 @@ static void csid_configure_stream(struct csid_device *csid, u8 enable)
 		val = HALT_CMD_RESUME_AT_FRAME_BOUNDARY << RDI_CTRL_HALT_CMD;
 	else
 		val = HALT_CMD_HALT_AT_FRAME_BOUNDARY << RDI_CTRL_HALT_CMD;
-	writel_relaxed(val, csid->base + CSID_RDI_CTRL(0));
+	writel_relaxed(val, csid->base + CSID_RDI_CTRL(vc));
+}
+
+static void csid_configure_stream(struct csid_device *csid, u8 enable)
+{
+	u8 i;
+	/* Loop through all enabled VCs and configure stream for each */
+	for (i = 0; i < MSM_CSID_MAX_SRC_STREAMS; i++)
+		if (csid->phy.en_vc & BIT(i))
+			__csid_configure_stream(csid, enable, i);
 }
 
 static int csid_configure_testgen_pattern(struct csid_device *csid, s32 val)
@@ -502,6 +511,7 @@ static irqreturn_t csid_isr(int irq, void *dev)
 	struct csid_device *csid = dev;
 	u32 val;
 	u8 reset_done;
+	int i;
 
 	val = readl_relaxed(csid->base + CSID_TOP_IRQ_STATUS);
 	writel_relaxed(val, csid->base + CSID_TOP_IRQ_CLEAR);
@@ -510,8 +520,12 @@ static irqreturn_t csid_isr(int irq, void *dev)
 	val = readl_relaxed(csid->base + CSID_CSI2_RX_IRQ_STATUS);
 	writel_relaxed(val, csid->base + CSID_CSI2_RX_IRQ_CLEAR);
 
-	val = readl_relaxed(csid->base + CSID_CSI2_RDIN_IRQ_STATUS(0));
-	writel_relaxed(val, csid->base + CSID_CSI2_RDIN_IRQ_CLEAR(0));
+	/* Read and clear IRQ status for each enabled RDI channel */
+	for (i = 0; i < MSM_CSID_MAX_SRC_STREAMS; i++)
+		if (csid->phy.en_vc & BIT(i)) {
+			val = readl_relaxed(csid->base + CSID_CSI2_RDIN_IRQ_STATUS(i));
+			writel_relaxed(val, csid->base + CSID_CSI2_RDIN_IRQ_CLEAR(i));
+		}
 
 	val = 1 << IRQ_CMD_CLEAR;
 	writel_relaxed(val, csid->base + CSID_IRQ_CMD);
diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
index 88f188e0f750..20c22564e0f9 100644
--- a/drivers/media/platform/qcom/camss/camss-csid.c
+++ b/drivers/media/platform/qcom/camss/camss-csid.c
@@ -209,6 +209,8 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
 		}
 
 		csid->ops->hw_version(csid);
+
+		csid->phy.need_vc_update = true;
 	} else {
 		disable_irq(csid->irq);
 		camss_disable_clocks(csid->nclocks, csid->clock);
@@ -249,7 +251,10 @@ static int csid_set_stream(struct v4l2_subdev *sd, int enable)
 			return -ENOLINK;
 	}
 
-	csid->ops->configure_stream(csid, enable);
+	if (csid->phy.need_vc_update) {
+		csid->ops->configure_stream(csid, enable);
+		csid->phy.need_vc_update = false;
+	}
 
 	return 0;
 }
@@ -460,6 +465,7 @@ static int csid_set_format(struct v4l2_subdev *sd,
 {
 	struct csid_device *csid = v4l2_get_subdevdata(sd);
 	struct v4l2_mbus_framefmt *format;
+	int i;
 
 	format = __csid_get_format(csid, sd_state, fmt->pad, fmt->which);
 	if (format == NULL)
@@ -468,14 +474,14 @@ static int csid_set_format(struct v4l2_subdev *sd,
 	csid_try_format(csid, sd_state, fmt->pad, &fmt->format, fmt->which);
 	*format = fmt->format;
 
-	/* Propagate the format from sink to source */
+	/* Propagate the format from sink to source pads */
 	if (fmt->pad == MSM_CSID_PAD_SINK) {
-		format = __csid_get_format(csid, sd_state, MSM_CSID_PAD_SRC,
-					   fmt->which);
+		for (i = MSM_CSID_PAD_FIRST_SRC; i < MSM_CSID_PADS_NUM; ++i) {
+			format = __csid_get_format(csid, sd_state, i, fmt->which);
 
-		*format = fmt->format;
-		csid_try_format(csid, sd_state, MSM_CSID_PAD_SRC, format,
-				fmt->which);
+			*format = fmt->format;
+			csid_try_format(csid, sd_state, i, format, fmt->which);
+		}
 	}
 
 	return 0;
@@ -738,7 +744,6 @@ static int csid_link_setup(struct media_entity *entity,
 		struct csid_device *csid;
 		struct csiphy_device *csiphy;
 		struct csiphy_lanes_cfg *lane_cfg;
-		struct v4l2_subdev_format format = { 0 };
 
 		sd = media_entity_to_v4l2_subdev(entity);
 		csid = v4l2_get_subdevdata(sd);
@@ -761,11 +766,22 @@ static int csid_link_setup(struct media_entity *entity,
 		lane_cfg = &csiphy->cfg.csi2->lane_cfg;
 		csid->phy.lane_cnt = lane_cfg->num_data;
 		csid->phy.lane_assign = csid_get_lane_assign(lane_cfg);
+	}
+	/* Decide which virtual channels to enable based on which source pads are enabled */
+	if (local->flags & MEDIA_PAD_FL_SOURCE) {
+		struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+		struct csid_device *csid = v4l2_get_subdevdata(sd);
+		struct device *dev = csid->camss->dev;
+
+		if (flags & MEDIA_LNK_FL_ENABLED)
+			csid->phy.en_vc |= BIT(local->index - 1);
+		else
+			csid->phy.en_vc &= ~BIT(local->index - 1);
 
-		/* Reset format on source pad to sink pad format */
-		format.pad = MSM_CSID_PAD_SRC;
-		format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
-		csid_set_format(&csid->subdev, NULL, &format);
+		csid->phy.need_vc_update = true;
+
+		dev_dbg(dev, "%s: Enabled CSID virtual channels mask 0x%x\n",
+			__func__, csid->phy.en_vc);
 	}
 
 	return 0;
@@ -816,6 +832,7 @@ int msm_csid_register_entity(struct csid_device *csid,
 	struct v4l2_subdev *sd = &csid->subdev;
 	struct media_pad *pads = csid->pads;
 	struct device *dev = csid->camss->dev;
+	int i;
 	int ret;
 
 	v4l2_subdev_init(sd, &csid_v4l2_ops);
@@ -852,7 +869,8 @@ int msm_csid_register_entity(struct csid_device *csid,
 	}
 
 	pads[MSM_CSID_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
-	pads[MSM_CSID_PAD_SRC].flags = MEDIA_PAD_FL_SOURCE;
+	for (i = MSM_CSID_PAD_FIRST_SRC; i < MSM_CSID_PADS_NUM; ++i)
+		pads[i].flags = MEDIA_PAD_FL_SOURCE;
 
 	sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
 	sd->entity.ops = &csid_media_ops;
diff --git a/drivers/media/platform/qcom/camss/camss-csid.h b/drivers/media/platform/qcom/camss/camss-csid.h
index f06040e44c51..d4b48432a097 100644
--- a/drivers/media/platform/qcom/camss/camss-csid.h
+++ b/drivers/media/platform/qcom/camss/camss-csid.h
@@ -19,8 +19,13 @@
 #include <media/v4l2-subdev.h>
 
 #define MSM_CSID_PAD_SINK 0
-#define MSM_CSID_PAD_SRC 1
-#define MSM_CSID_PADS_NUM 2
+#define MSM_CSID_PAD_FIRST_SRC 1
+#define MSM_CSID_PADS_NUM 5
+
+#define MSM_CSID_PAD_SRC (MSM_CSID_PAD_FIRST_SRC)
+
+/* CSID hardware can demultiplex up to 4 outputs */
+#define MSM_CSID_MAX_SRC_STREAMS	4
 
 #define DATA_TYPE_EMBEDDED_DATA_8BIT	0x12
 #define DATA_TYPE_YUV420_8BIT		0x18
@@ -81,6 +86,8 @@ struct csid_phy_config {
 	u8 csiphy_id;
 	u8 lane_cnt;
 	u32 lane_assign;
+	u32 en_vc;
+	u8 need_vc_update;
 };
 
 struct csid_device;
-- 
2.37.3

[PATCH v5 2/4] media: camss: vfe: Reserve VFE lines on stream start and link to CSID

[quic_mmitkov]

From: Milen Mitkov <quic_mmitkov@quicinc.com>

For multiple virtual channels support, each VFE line can be in either
ON, RESERVED or OFF states. This allows the starting and stopping
of a VFE line independently of other active VFE lines.

Also, link the CSID entity's source ports to corresponding VFE lines.

Signed-off-by: Milen Mitkov <quic_mmitkov@quicinc.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Robert Foss <robert.foss@linaro.org>
---
 drivers/media/platform/qcom/camss/camss-vfe.c | 1 +
 drivers/media/platform/qcom/camss/camss.c     | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
index a26e4a5d87b6..e0832f3f4f25 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -740,6 +740,7 @@ static int vfe_set_stream(struct v4l2_subdev *sd, int enable)
 	int ret;
 
 	if (enable) {
+		line->output.state = VFE_OUTPUT_RESERVED;
 		ret = vfe->ops->vfe_enable(line);
 		if (ret < 0)
 			dev_err(vfe->camss->dev,
diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index 9cda284f1e71..547099f8ed14 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -1320,7 +1320,7 @@ static int camss_register_entities(struct camss *camss)
 					struct v4l2_subdev *vfe = &camss->vfe[k].line[j].subdev;
 
 					ret = media_create_pad_link(&csid->entity,
-								    MSM_CSID_PAD_SRC,
+								    MSM_CSID_PAD_FIRST_SRC + j,
 								    &vfe->entity,
 								    MSM_VFE_PAD_SINK,
 								    0);
-- 
2.37.3

[PATCH v5 3/4] media: camss: vfe-480: Multiple outputs support for SM8250

[quic_mmitkov]

From: Milen Mitkov <quic_mmitkov@quicinc.com>

On SM8250 each VFE supports at least 3 RDI channels, or 4
in case of VFE-Lite, so add appropriate IRQ setup and handling.

Signed-off-by: Milen Mitkov <quic_mmitkov@quicinc.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Robert Foss <robert.foss@linaro.org>
---
 .../media/platform/qcom/camss/camss-vfe-480.c | 61 ++++++++++++-------
 1 file changed, 40 insertions(+), 21 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe-480.c b/drivers/media/platform/qcom/camss/camss-vfe-480.c
index 3aa962b5663b..f70aad2e8c23 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-480.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-480.c
@@ -94,6 +94,8 @@ static inline int bus_irq_mask_0_comp_done(struct vfe_device *vfe, int n)
 #define RDI_WM(n)			((IS_LITE ? 0 : 23) + (n))
 #define RDI_COMP_GROUP(n)		((IS_LITE ? 0 : 11) + (n))
 
+#define MAX_VFE_OUTPUT_LINES	4
+
 static u32 vfe_hw_version(struct vfe_device *vfe)
 {
 	u32 hw_version = readl_relaxed(vfe->base + VFE_HW_VERSION);
@@ -171,12 +173,26 @@ static inline void vfe_reg_update_clear(struct vfe_device *vfe,
 
 static void vfe_enable_irq_common(struct vfe_device *vfe)
 {
-	/* enable only the IRQs used: rup and comp_done irqs for RDI0 */
+	/* enable reset ack IRQ and top BUS status IRQ */
 	writel_relaxed(IRQ_MASK_0_RESET_ACK | IRQ_MASK_0_BUS_TOP_IRQ,
 		       vfe->base + VFE_IRQ_MASK(0));
-	writel_relaxed(BUS_IRQ_MASK_0_RDI_RUP(vfe, 0) |
-		       BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(0)),
-		       vfe->base + VFE_BUS_IRQ_MASK(0));
+}
+
+static void vfe_enable_lines_irq(struct vfe_device *vfe)
+{
+	int i;
+	u32 bus_irq_mask = 0;
+
+	for (i = 0; i < MAX_VFE_OUTPUT_LINES; i++) {
+		/* Enable IRQ for newly added lines, but also keep already running lines's IRQ */
+		if (vfe->line[i].output.state == VFE_OUTPUT_RESERVED ||
+		    vfe->line[i].output.state == VFE_OUTPUT_ON) {
+			bus_irq_mask |= BUS_IRQ_MASK_0_RDI_RUP(vfe, i)
+					| BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(i));
+			}
+	}
+
+	writel_relaxed(bus_irq_mask, vfe->base + VFE_BUS_IRQ_MASK(0));
 }
 
 static void vfe_isr_reg_update(struct vfe_device *vfe, enum vfe_line_id line_id);
@@ -193,6 +209,7 @@ static irqreturn_t vfe_isr(int irq, void *dev)
 {
 	struct vfe_device *vfe = dev;
 	u32 status;
+	int i;
 
 	status = readl_relaxed(vfe->base + VFE_IRQ_STATUS(0));
 	writel_relaxed(status, vfe->base + VFE_IRQ_CLEAR(0));
@@ -207,11 +224,14 @@ static irqreturn_t vfe_isr(int irq, void *dev)
 		writel_relaxed(status, vfe->base + VFE_BUS_IRQ_CLEAR(0));
 		writel_relaxed(1, vfe->base + VFE_BUS_IRQ_CLEAR_GLOBAL);
 
-		if (status & BUS_IRQ_MASK_0_RDI_RUP(vfe, 0))
-			vfe_isr_reg_update(vfe, 0);
+		/* Loop through all WMs IRQs */
+		for (i = 0; i < MSM_VFE_IMAGE_MASTERS_NUM; i++) {
+			if (status & BUS_IRQ_MASK_0_RDI_RUP(vfe, i))
+				vfe_isr_reg_update(vfe, i);
 
-		if (status & BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(0)))
-			vfe_isr_wm_done(vfe, 0);
+			if (status & BUS_IRQ_MASK_0_COMP_DONE(vfe, RDI_COMP_GROUP(i)))
+				vfe_isr_wm_done(vfe, i);
+		}
 	}
 
 	return IRQ_HANDLED;
@@ -234,24 +254,23 @@ static int vfe_get_output(struct vfe_line *line)
 	struct vfe_device *vfe = to_vfe(line);
 	struct vfe_output *output;
 	unsigned long flags;
-	int wm_idx;
 
 	spin_lock_irqsave(&vfe->output_lock, flags);
 
 	output = &line->output;
-	if (output->state != VFE_OUTPUT_OFF) {
+	if (output->state > VFE_OUTPUT_RESERVED) {
 		dev_err(vfe->camss->dev, "Output is running\n");
 		goto error;
 	}
 
 	output->wm_num = 1;
 
-	wm_idx = vfe_reserve_wm(vfe, line->id);
-	if (wm_idx < 0) {
-		dev_err(vfe->camss->dev, "Can not reserve wm\n");
-		goto error_get_wm;
-	}
-	output->wm_idx[0] = wm_idx;
+	/* Correspondence between VFE line number and WM number.
+	 * line 0 -> RDI 0, line 1 -> RDI1, line 2 -> RDI2, line 3 -> PIX/RDI3
+	 * Note this 1:1 mapping will not work for PIX streams.
+	 */
+	output->wm_idx[0] = line->id;
+	vfe->wm_output_map[line->id] = line->id;
 
 	output->drop_update_idx = 0;
 
@@ -259,11 +278,9 @@ static int vfe_get_output(struct vfe_line *line)
 
 	return 0;
 
-error_get_wm:
-	vfe_release_wm(vfe, output->wm_idx[0]);
-	output->state = VFE_OUTPUT_OFF;
 error:
 	spin_unlock_irqrestore(&vfe->output_lock, flags);
+	output->state = VFE_OUTPUT_OFF;
 
 	return -EINVAL;
 }
@@ -279,7 +296,7 @@ static int vfe_enable_output(struct vfe_line *line)
 
 	vfe_reg_update_clear(vfe, line->id);
 
-	if (output->state != VFE_OUTPUT_OFF) {
+	if (output->state > VFE_OUTPUT_RESERVED) {
 		dev_err(vfe->camss->dev, "Output is not in reserved state %d\n",
 			output->state);
 		spin_unlock_irqrestore(&vfe->output_lock, flags);
@@ -360,6 +377,8 @@ static int vfe_enable(struct vfe_line *line)
 
 	vfe->stream_count++;
 
+	vfe_enable_lines_irq(vfe);
+
 	mutex_unlock(&vfe->stream_lock);
 
 	ret = vfe_get_output(line);
@@ -566,7 +585,7 @@ static const struct camss_video_ops vfe_video_ops_480 = {
 static void vfe_subdev_init(struct device *dev, struct vfe_device *vfe)
 {
 	vfe->video_ops = vfe_video_ops_480;
-	vfe->line_num = 1;
+	vfe->line_num = MAX_VFE_OUTPUT_LINES;
 }
 
 const struct vfe_hw_ops vfe_ops_480 = {
-- 
2.37.3

[PATCH v5 4/4] media: camss: sm8250: Pipeline starting and stopping for multiple virtual channels

[quic_mmitkov]

From: Milen Mitkov <quic_mmitkov@quicinc.com>

Use the multistream series function video_device_pipeline_alloc_start
to allows multiple clients of the same pipeline.

If the VFE entity is used by another instance of the pipeline,
the pipeline won't be stopped. This allows for stopping and starting
streams at any point without disrupting the other running streams.

Signed-off-by: Milen Mitkov <quic_mmitkov@quicinc.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Acked-by: Robert Foss <robert.foss@linaro.org>
---
 .../media/platform/qcom/camss/camss-video.c   | 21 ++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-video.c b/drivers/media/platform/qcom/camss/camss-video.c
index 41deda232e4a..12ac7d4d755e 100644
--- a/drivers/media/platform/qcom/camss/camss-video.c
+++ b/drivers/media/platform/qcom/camss/camss-video.c
@@ -351,6 +351,7 @@ static int video_get_subdev_format(struct camss_video *video,
 	if (subdev == NULL)
 		return -EPIPE;
 
+	memset(&fmt, 0, sizeof(fmt));
 	fmt.pad = pad;
 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 
@@ -493,9 +494,11 @@ static int video_start_streaming(struct vb2_queue *q, unsigned int count)
 	struct v4l2_subdev *subdev;
 	int ret;
 
-	ret = video_device_pipeline_start(vdev, &video->pipe);
-	if (ret < 0)
+	ret = video_device_pipeline_alloc_start(vdev);
+	if (ret < 0) {
+		dev_err(video->camss->dev, "Failed to start media pipeline: %d\n", ret);
 		goto flush_buffers;
+	}
 
 	ret = video_check_format(video);
 	if (ret < 0)
@@ -537,6 +540,7 @@ static void video_stop_streaming(struct vb2_queue *q)
 	struct media_entity *entity;
 	struct media_pad *pad;
 	struct v4l2_subdev *subdev;
+	int ret;
 
 	entity = &vdev->entity;
 	while (1) {
@@ -551,7 +555,18 @@ static void video_stop_streaming(struct vb2_queue *q)
 		entity = pad->entity;
 		subdev = media_entity_to_v4l2_subdev(entity);
 
-		v4l2_subdev_call(subdev, video, s_stream, 0);
+		ret = v4l2_subdev_call(subdev, video, s_stream, 0);
+
+		if (entity->use_count > 1) {
+			/* Don't stop if other instances of the pipeline are still running */
+			dev_dbg(video->camss->dev, "Video pipeline still used, don't stop streaming.\n");
+			return;
+		}
+
+		if (ret) {
+			dev_err(video->camss->dev, "Video pipeline stop failed: %d\n", ret);
+			return;
+		}
 	}
 
 	video_device_pipeline_stop(vdev);
-- 
2.37.3

Re: [PATCH v5 0/4] media: camss: sm8250: Virtual channels support for SM8250

[Bryan O'Donoghue]

On 28/11/2022 14:42, quic_mmitkov@quicinc.com wrote:
> With these changes, the CSID entity has, as it did previously, a single
> sink port (0), and always exposes 4 source ports (1, 2,3, 4). The
> virtual channel configuration is determined by which of the source ports
> are linked to an output VFE line. For example, the link below will
> configure the CSID driver to enable vc 0 and vc 1:
> 
> media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
> media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'

Following your instructions here

root@linaro-gnome:~# media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
root@linaro-gnome:~# media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'
root@linaro-gnome:~# media-ctl -l '"msm_csid0":3->"msm_vfe0_rdi2":0[1]'
root@linaro-gnome:~# media-ctl -l '"msm_csid0":4->"msm_vfe0_rdi3":0[1]'
Unable to parse link: Invalid argument (22)

?

---
bod

Re: [PATCH v5 0/4] media: camss: sm8250: Virtual channels support for SM8250

[Milen Mitkov (Consultant)]

On 30/11/2022 17:50, Bryan O'Donoghue wrote:
> On 28/11/2022 14:42, quic_mmitkov@quicinc.com wrote:
>> With these changes, the CSID entity has, as it did previously, a single
>> sink port (0), and always exposes 4 source ports (1, 2,3, 4). The
>> virtual channel configuration is determined by which of the source ports
>> are linked to an output VFE line. For example, the link below will
>> configure the CSID driver to enable vc 0 and vc 1:
>>
>> media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
>> media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'
>
> Following your instructions here
>
> root@linaro-gnome:~# media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
> root@linaro-gnome:~# media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'
> root@linaro-gnome:~# media-ctl -l '"msm_csid0":3->"msm_vfe0_rdi2":0[1]'
> root@linaro-gnome:~# media-ctl -l '"msm_csid0":4->"msm_vfe0_rdi3":0[1]'
> Unable to parse link: Invalid argument (22)
>
> ?
>
> ---
> bod

Hi Bryan,

Thanks for the feedback! There are the following IFEs on SM8250 (Titan 4.8):

IFE0 -> has 3 RDI lines and 1 PIX line

IFE1 -> has 3 RDI lines and 1 PIX line

IFELite0 -> has 4 RDI lines

IFELite1 -> has 4 RDI lines

so there's no msm_vfe0_rdi3 port for IFE0 and IFE1 at all, only rdi0, 
rdi1, rdi2. In theory if you link the 4th CSID source port to 
msm_vfe0_pix the parsing works:

media-ctl -l '"msm_csid0":4->"msm_vfe0_pix":0[1]'

However, in practice, there's no PIX support in camss so even if the 
linking works, the hardware won't get configured properly.

You can however use the IFELite's 4th RDI port. Due to omission in 
camss-vfe there isn't any separate logic for naming the sink ports of 
IFELite's devies so it's still called "pix", even though it's not a pix 
port. It should be a small code change to fix the naming of the port for 
IFELite, I could do it as part of this patch set or as a new patch after 
this patch set gets merged. Which is the preferred way?

Regards,

Milen

Re: [PATCH v5 0/4] media: camss: sm8250: Virtual channels support for SM8250

[Bryan O'Donoghue]

On 30/11/2022 17:04, Milen Mitkov (Consultant) wrote:
> On 30/11/2022 17:50, Bryan O'Donoghue wrote:
>> On 28/11/2022 14:42, quic_mmitkov@quicinc.com wrote:
>>> With these changes, the CSID entity has, as it did previously, a single
>>> sink port (0), and always exposes 4 source ports (1, 2,3, 4). The
>>> virtual channel configuration is determined by which of the source ports
>>> are linked to an output VFE line. For example, the link below will
>>> configure the CSID driver to enable vc 0 and vc 1:
>>>
>>> media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
>>> media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'
>>
>> Following your instructions here
>>
>> root@linaro-gnome:~# media-ctl -l '"msm_csid0":1->"msm_vfe0_rdi0":0[1]'
>> root@linaro-gnome:~# media-ctl -l '"msm_csid0":2->"msm_vfe0_rdi1":0[1]'
>> root@linaro-gnome:~# media-ctl -l '"msm_csid0":3->"msm_vfe0_rdi2":0[1]'
>> root@linaro-gnome:~# media-ctl -l '"msm_csid0":4->"msm_vfe0_rdi3":0[1]'
>> Unable to parse link: Invalid argument (22)
>>
>> ?
>>
>> ---
>> bod
> 
> Hi Bryan,
> 
> Thanks for the feedback! There are the following IFEs on SM8250 (Titan 
> 4.8):
> 
> IFE0 -> has 3 RDI lines and 1 PIX line
> 
> IFE1 -> has 3 RDI lines and 1 PIX line
> 
> IFELite0 -> has 4 RDI lines
> 
> IFELite1 -> has 4 RDI lines
> 
> so there's no msm_vfe0_rdi3 port for IFE0 and IFE1 at all, only rdi0, 
> rdi1, rdi2. In theory if you link the 4th CSID source port to 
> msm_vfe0_pix the parsing works:
> 
> media-ctl -l '"msm_csid0":4->"msm_vfe0_pix":0[1]'
> 
> However, in practice, there's no PIX support in camss so even if the 
> linking works, the hardware won't get configured properly.
> 
> You can however use the IFELite's 4th RDI port. Due to omission in 
> camss-vfe there isn't any separate logic for naming the sink ports of 
> IFELite's devies so it's still called "pix", even though it's not a pix 
> port. It should be a small code change to fix the naming of the port for 
> IFELite, I could do it as part of this patch set or as a new patch after 
> this patch set gets merged. Which is the preferred way?
> 
> Regards,
> 
> Milen
> 

Hmm, OK the pix mapping works for me, thanks, the

It would be good to fixup the name, maybe as an additional patch.

Also the above description contains important information. IMO its 
worthwhile to include information like that in the git log.

i.e. IFE <-> RDI mapping, IFELite <-> RDI mapping

Also suggest adding example media-ctl commands for the VCs to your git 
log both for yourself to remember - I'm usually logging so that I can 
remind myself - but also for other people to more easily 
replicate/validate your work.

---
bod

Re: [PATCH v5 1/4] media: camss: sm8250: Virtual channels for CSID

[Bryan O'Donoghue]

On 28/11/2022 14:42, quic_mmitkov@quicinc.com wrote:

Hey Milen.

This bit here is racy.

> +
> +		csid->phy.need_vc_update = true;


enable_irq(csid->irq);

ret = csid->ops->reset(csid);
if (ret < 0) {
	disable_irq(csid->irq);
	camss_disable_clocks(csid->nclocks, csid->clock);
	regulator_bulk_disable(csid->num_supplies,
			       csid->supplies);
	pm_runtime_put_sync(dev);
	return ret;
}

csid->ops->hw_version(csid);

csid->phy.need_vc_update = true;

You're updating need_vc_update - after enabling the IRQ.
Its a hypothetical bug but still not thread safe even if it has no 
unintended side-effects we should initalise all of our data-structures 
prior to enabling a potential path of parallel execution.

---
bod