[openwrt/staging/neocturne.git] /

From 425a6b752c38b50c97220db37a67b18b281f56e5 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Date: Thu, 21 Sep 2023 15:28:20 +0300
Subject: [PATCH] media: rp1: csi2: Use get_frame_desc to get CSI-2 VC and DT

Use get_frame_desc pad op for asking the CSI-2 VC and DT from the source
device driver, instead of hardcoding to VC 0, and getting the DT from a
formats table. To keep backward compatibility with sources that do not
implement get_frame_desc, implement a fallback mechanism that always
uses VC 0, and gets the DT from the formats table, based on the CSI2's
sink pad's format.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 .../media/platform/raspberrypi/rp1_cfe/cfe.c  |  4 +-
 .../media/platform/raspberrypi/rp1_cfe/csi2.c | 75 ++++++++++++++++++-
 .../media/platform/raspberrypi/rp1_cfe/csi2.h |  2 +-
 3 files changed, 77 insertions(+), 4 deletions(-)

--- a/drivers/media/platform/raspberrypi/rp1_cfe/cfe.c
+++ b/drivers/media/platform/raspberrypi/rp1_cfe/cfe.c
@@ -838,7 +838,7 @@ static void cfe_start_channel(struct cfe
                 * this is handled by the CSI2 AUTO_ARM mode.
                 */
                csi2_start_channel(&cfe->csi2, cfe->fe_csi2_channel,
-                                  fmt->csi_dt, CSI2_MODE_FE_STREAMING,
+                                  CSI2_MODE_FE_STREAMING,
                                   true, false, width, height);
                csi2_set_buffer(&cfe->csi2, cfe->fe_csi2_channel, 0, 0, -1);
                pisp_fe_start(&cfe->fe);
@@ -872,7 +872,7 @@ static void cfe_start_channel(struct cfe
                        }
                }
                /* Unconditionally start this CSI2 channel. */
-               csi2_start_channel(&cfe->csi2, node->id, fmt->csi_dt,
+               csi2_start_channel(&cfe->csi2, node->id,
                                   mode,
                                   /* Auto arm */
                                   false,
--- a/drivers/media/platform/raspberrypi/rp1_cfe/csi2.c
+++ b/drivers/media/platform/raspberrypi/rp1_cfe/csi2.c
@@ -324,12 +324,84 @@ void csi2_set_compression(struct csi2_de
        csi2_reg_write(csi2, CSI2_CH_COMP_CTRL(channel), compression);
 }
 
+static int csi2_get_vc_dt_fallback(struct csi2_device *csi2,
+                                  unsigned int channel, u8 *vc, u8 *dt)
+{
+       struct v4l2_subdev *sd = &csi2->sd;
+       struct v4l2_subdev_state *state;
+       struct v4l2_mbus_framefmt *fmt;
+       const struct cfe_fmt *cfe_fmt;
+
+       state = v4l2_subdev_get_locked_active_state(sd);
+
+       /* Without Streams API, the channel number matches the sink pad */
+       fmt = v4l2_subdev_get_pad_format(sd, state, channel);
+       if (!fmt)
+               return -EINVAL;
+
+       cfe_fmt = find_format_by_code(fmt->code);
+       if (!cfe_fmt)
+               return -EINVAL;
+
+       *vc = 0;
+       *dt = cfe_fmt->csi_dt;
+
+       return 0;
+}
+
+static int csi2_get_vc_dt(struct csi2_device *csi2, unsigned int channel,
+                         u8 *vc, u8 *dt)
+{
+       struct v4l2_mbus_frame_desc remote_desc;
+       const struct media_pad *remote_pad;
+       struct v4l2_subdev *source_sd;
+       int ret;
+
+       /* Without Streams API, the channel number matches the sink pad */
+       remote_pad = media_pad_remote_pad_first(&csi2->pad[channel]);
+       if (!remote_pad)
+               return -EPIPE;
+
+       source_sd = media_entity_to_v4l2_subdev(remote_pad->entity);
+
+       ret = v4l2_subdev_call(source_sd, pad, get_frame_desc,
+                              remote_pad->index, &remote_desc);
+       if (ret == -ENOIOCTLCMD) {
+               csi2_dbg("source does not support get_frame_desc, use fallback\n");
+               return csi2_get_vc_dt_fallback(csi2, channel, vc, dt);
+       } else if (ret) {
+               csi2_err("Failed to get frame descriptor\n");
+               return ret;
+       }
+
+       if (remote_desc.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2) {
+               csi2_err("Frame descriptor does not describe CSI-2 link");
+               return -EINVAL;
+       }
+
+       if (remote_desc.num_entries != 1) {
+               csi2_err("Frame descriptor does not have a single entry");
+               return -EINVAL;
+       }
+
+       *vc = remote_desc.entry[0].bus.csi2.vc;
+       *dt = remote_desc.entry[0].bus.csi2.dt;
+
+       return 0;
+}
+
 void csi2_start_channel(struct csi2_device *csi2, unsigned int channel,
-                       u16 dt, enum csi2_mode mode, bool auto_arm,
+                       enum csi2_mode mode, bool auto_arm,
                        bool pack_bytes, unsigned int width,
                        unsigned int height)
 {
        u32 ctrl;
+       int ret;
+       u8 vc, dt;
+
+       ret = csi2_get_vc_dt(csi2, channel, &vc, &dt);
+       if (ret)
+               return;
 
        csi2_dbg("%s [%u]\n", __func__, channel);
 
@@ -369,6 +441,7 @@ void csi2_start_channel(struct csi2_devi
                csi2_reg_write(csi2, CSI2_CH_FRAME_SIZE(channel), 0);
        }
 
+       set_field(&ctrl, vc, VC_MASK);
        set_field(&ctrl, dt, DT_MASK);
        csi2_reg_write(csi2, CSI2_CH_CTRL(channel), ctrl);
        csi2->num_lines[channel] = height;
--- a/drivers/media/platform/raspberrypi/rp1_cfe/csi2.h
+++ b/drivers/media/platform/raspberrypi/rp1_cfe/csi2.h
@@ -79,7 +79,7 @@ void csi2_set_compression(struct csi2_de
                          enum csi2_compression_mode mode, unsigned int shift,
                          unsigned int offset);
 void csi2_start_channel(struct csi2_device *csi2, unsigned int channel,
-                       u16 dt, enum csi2_mode mode, bool auto_arm,
+                       enum csi2_mode mode, bool auto_arm,
                        bool pack_bytes, unsigned int width,
                        unsigned int height);
 void csi2_stop_channel(struct csi2_device *csi2, unsigned int channel);