v4l2_subdev_enable/disable_streams_fallback() supports falling back to .s_stream() for subdevs with a single source pad. It also tracks the enabled streams for that one pad in the sd->enabled_streams field. Tracking the enabled streams with sd->enabled_streams does not make sense, as with .s_stream() there can only be a single stream per pad. Thus, as the v4l2_subdev_enable/disable_streams_fallback() only supports a single source pad, all we really need is a boolean which tells whether streaming has been enabled on this pad or not. However, as we only need a true/false state for a pad (instead of tracking which streams have been enabled for a pad), we can easily extend the fallback mechanism to support multiple source pads as we only need to keep track of which pads have been enabled. Change the sd->enabled_streams field to sd->enabled_pads, which is a 64-bit bitmask tracking the enabled source pads. With this change we can remove the restriction that v4l2_subdev_enable/disable_streams_fallback() only supports a single soruce pad. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx> --- drivers/media/v4l2-core/v4l2-subdev.c | 68 ++++++++++++++++++++--------------- include/media/v4l2-subdev.h | 9 +++-- 2 files changed, 44 insertions(+), 33 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index 3b3310bce5d4..91298bb84e6b 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -2090,37 +2090,43 @@ static int v4l2_subdev_enable_streams_fallback(struct v4l2_subdev *sd, u32 pad, u64 streams_mask) { struct device *dev = sd->entity.graph_obj.mdev->dev; - unsigned int i; int ret; /* * The subdev doesn't implement pad-based stream enable, fall back - * on the .s_stream() operation. This can only be done for subdevs that - * have a single source pad, as sd->enabled_streams is global to the - * subdev. + * on the .s_stream() operation. */ if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE)) return -EOPNOTSUPP; - for (i = 0; i < sd->entity.num_pads; ++i) { - if (i != pad && sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE) - return -EOPNOTSUPP; - } + /* + * .s_stream() means there is no streams support, so only allowed stream + * is the imlicit stream 0. + */ + if (streams_mask != BIT_ULL(0)) + return -EOPNOTSUPP; + + /* + * We use a 64-bit bitmask for tracking enabled pads, so only subdevices + * with 64 pads or less can be supported. + */ + if (pad >= sizeof(sd->enabled_pads) * 8) + return -EOPNOTSUPP; - if (sd->enabled_streams & streams_mask) { - dev_dbg(dev, "set of streams %#llx already enabled on %s:%u\n", - streams_mask, sd->entity.name, pad); + if (sd->enabled_pads & BIT_ULL(pad)) { + dev_dbg(dev, "pad %u already enabled on %s\n", + pad, sd->entity.name); return -EALREADY; } - /* Start streaming when the first streams are enabled. */ - if (!sd->enabled_streams) { + /* Start streaming when the first pad is enabled. */ + if (!sd->enabled_pads) { ret = v4l2_subdev_call(sd, video, s_stream, 1); if (ret) return ret; } - sd->enabled_streams |= streams_mask; + sd->enabled_pads |= BIT_ULL(pad); return 0; } @@ -2207,37 +2213,43 @@ static int v4l2_subdev_disable_streams_fallback(struct v4l2_subdev *sd, u32 pad, u64 streams_mask) { struct device *dev = sd->entity.graph_obj.mdev->dev; - unsigned int i; int ret; /* - * If the subdev doesn't implement pad-based stream enable, fall back - * on the .s_stream() operation. This can only be done for subdevs that - * have a single source pad, as sd->enabled_streams is global to the - * subdev. + * If the subdev doesn't implement pad-based stream enable, fall back + * on the .s_stream() operation. */ if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE)) return -EOPNOTSUPP; - for (i = 0; i < sd->entity.num_pads; ++i) { - if (i != pad && sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE) - return -EOPNOTSUPP; - } + /* + * .s_stream() means there is no streams support, so only allowed stream + * is the imlicit stream 0. + */ + if (streams_mask != BIT_ULL(0)) + return -EOPNOTSUPP; + + /* + * We use a 64-bit bitmask for tracking enabled pads, so only subdevices + * with 64 pads or less can be supported. + */ + if (pad >= sizeof(sd->enabled_pads) * 8) + return -EOPNOTSUPP; - if ((sd->enabled_streams & streams_mask) != streams_mask) { - dev_dbg(dev, "set of streams %#llx already disabled on %s:%u\n", - streams_mask, sd->entity.name, pad); + if ((sd->enabled_pads & BIT_ULL(pad)) != BIT_ULL(pad)) { + dev_dbg(dev, "pad %u already disabled on %s\n", + pad, sd->entity.name); return -EALREADY; } /* Stop streaming when the last streams are disabled. */ - if (!(sd->enabled_streams & ~streams_mask)) { + if (!(sd->enabled_pads & ~BIT_ULL(pad))) { ret = v4l2_subdev_call(sd, video, s_stream, 0); if (ret) return ret; } - sd->enabled_streams &= ~streams_mask; + sd->enabled_pads &= ~BIT_ULL(pad); return 0; } diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 8bd1e3c96d2b..7077aec3176c 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -1039,10 +1039,9 @@ struct v4l2_subdev_platform_data { * @active_state: Active state for the subdev (NULL for subdevs tracking the * state internally). Initialized by calling * v4l2_subdev_init_finalize(). - * @enabled_streams: Bitmask of enabled streams used by - * v4l2_subdev_enable_streams() and - * v4l2_subdev_disable_streams() helper functions for fallback - * cases. + * @enabled_pads: Bitmask of enabled pads used by v4l2_subdev_enable_streams() + * and v4l2_subdev_disable_streams() helper functions for + * fallback cases. * @streaming_enabled: Tracks whether streaming has been enabled with s_stream. * * Each instance of a subdev driver should create this struct, either @@ -1091,7 +1090,7 @@ struct v4l2_subdev { * doesn't support it. */ struct v4l2_subdev_state *active_state; - u64 enabled_streams; + u64 enabled_pads; bool streaming_enabled; }; -- 2.34.1