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SubjectRe: [PATCH 1/3] media: vsp1: drm: Split vsp1_du_setup_lif()
Hi Kieran,

Thank you for the patch.

On Fri, May 17, 2019 at 11:31:41PM +0100, Kieran Bingham wrote:
> Break vsp1_du_setup_lif() into components more suited to the DRM Atomic
> API. The existing vsp1_du_setup_lif() API call is maintained as it is
> still used from the DU.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> ---
> drivers/media/platform/vsp1/vsp1_drm.c | 233 ++++++++++++++++++-------
> include/media/vsp1.h | 32 +++-
> 2 files changed, 199 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_drm.c b/drivers/media/platform/vsp1/vsp1_drm.c
> index a4a45d68a6ef..ce5c0780680f 100644
> --- a/drivers/media/platform/vsp1/vsp1_drm.c
> +++ b/drivers/media/platform/vsp1/vsp1_drm.c
> @@ -616,18 +616,15 @@ int vsp1_du_init(struct device *dev)
> EXPORT_SYMBOL_GPL(vsp1_du_init);
>
> /**
> - * vsp1_du_setup_lif - Setup the output part of the VSP pipeline
> + * vsp1_du_atomic_modeset - Configure the mode as part of an atomic update
> * @dev: the VSP device
> * @pipe_index: the DRM pipeline index
> - * @cfg: the LIF configuration
> + * @cfg: the mode configuration
> *
> * Configure the output part of VSP DRM pipeline for the given frame @cfg.width
> * and @cfg.height. This sets up formats on the BRx source pad, the WPF sink and
> * source pads, and the LIF sink pad.
> *
> - * The @pipe_index argument selects which DRM pipeline to setup. The number of
> - * available pipelines depend on the VSP instance.
> - *

Shouldn't this paragraph be preserved, as the function keeps its
pipe_index argument ?

> * As the media bus code on the blend unit source pad is conditioned by the
> * configuration of its sink 0 pad, we also set up the formats on all blend unit
> * sinks, even if the configuration will be overwritten later by
> @@ -635,15 +632,14 @@ EXPORT_SYMBOL_GPL(vsp1_du_init);
> * a well defined state.
> *
> * Return 0 on success or a negative error code on failure.
> + *

Not needed.

> */
> -int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> - const struct vsp1_du_lif_config *cfg)
> +int vsp1_du_atomic_modeset(struct device *dev, unsigned int pipe_index,
> + const struct vsp1_du_modeset_config *cfg)
> {
> struct vsp1_device *vsp1 = dev_get_drvdata(dev);
> struct vsp1_drm_pipeline *drm_pipe;
> struct vsp1_pipeline *pipe;
> - unsigned long flags;
> - unsigned int i;
> int ret;
>
> if (pipe_index >= vsp1->info->lif_count)
> @@ -652,60 +648,6 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> drm_pipe = &vsp1->drm->pipe[pipe_index];
> pipe = &drm_pipe->pipe;
>
> - if (!cfg) {
> - struct vsp1_brx *brx;
> -
> - mutex_lock(&vsp1->drm->lock);
> -
> - brx = to_brx(&pipe->brx->subdev);
> -
> - /*
> - * NULL configuration means the CRTC is being disabled, stop
> - * the pipeline and turn the light off.
> - */
> - ret = vsp1_pipeline_stop(pipe);
> - if (ret == -ETIMEDOUT)
> - dev_err(vsp1->dev, "DRM pipeline stop timeout\n");
> -
> - for (i = 0; i < ARRAY_SIZE(pipe->inputs); ++i) {
> - struct vsp1_rwpf *rpf = pipe->inputs[i];
> -
> - if (!rpf)
> - continue;
> -
> - /*
> - * Remove the RPF from the pipe and the list of BRx
> - * inputs.
> - */
> - WARN_ON(!rpf->entity.pipe);
> - rpf->entity.pipe = NULL;
> - list_del(&rpf->entity.list_pipe);
> - pipe->inputs[i] = NULL;
> -
> - brx->inputs[rpf->brx_input].rpf = NULL;
> - }
> -
> - drm_pipe->du_complete = NULL;
> - pipe->num_inputs = 0;
> -
> - dev_dbg(vsp1->dev, "%s: pipe %u: releasing %s\n",
> - __func__, pipe->lif->index,
> - BRX_NAME(pipe->brx));
> -
> - list_del(&pipe->brx->list_pipe);
> - pipe->brx->pipe = NULL;
> - pipe->brx = NULL;
> -
> - mutex_unlock(&vsp1->drm->lock);
> -
> - vsp1_dlm_reset(pipe->output->dlm);
> - vsp1_device_put(vsp1);
> -
> - dev_dbg(vsp1->dev, "%s: pipeline disabled\n", __func__);
> -
> - return 0;
> - }
> -
> drm_pipe->width = cfg->width;
> drm_pipe->height = cfg->height;
> pipe->interlaced = cfg->interlaced;
> @@ -722,8 +664,43 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> goto unlock;
>
> ret = vsp1_du_pipeline_setup_output(vsp1, pipe);
> - if (ret < 0)
> - goto unlock;
> +
> +unlock:
> + mutex_unlock(&vsp1->drm->lock);
> +
> + return ret;
> +}
> +
> +/**
> + * vsp1_du_atomic_enable - Enable and start a DU pipeline
> + * @dev: the VSP device
> + * @pipe_index: the DRM pipeline index
> + * @cfg: the enablement configuration

Not a big fan of this description or of the vsp1_du_enable_config name,
but I can't really think of a better alternative. vsp1_du_callback would
be an option, but it would prevent us from adding new fields not related
to the callback.

> + *
> + * The @pipe_index argument selects which DRM pipeline to enable. The number of
> + * available pipelines depend on the VSP instance.
> + *
> + * The configuration passes a callback function to register notification of
> + * frame completion events.
> + *
> + * Return 0 on success or a negative error code on failure.
> + */
> +int vsp1_du_atomic_enable(struct device *dev, unsigned int pipe_index,
> + const struct vsp1_du_enable_config *cfg)
> +{
> + struct vsp1_device *vsp1 = dev_get_drvdata(dev);
> + struct vsp1_drm_pipeline *drm_pipe;
> + struct vsp1_pipeline *pipe;
> + unsigned long flags;
> + int ret;
> +
> + if (pipe_index >= vsp1->info->lif_count)
> + return -EINVAL;
> +
> + drm_pipe = &vsp1->drm->pipe[pipe_index];
> + pipe = &drm_pipe->pipe;
> +
> + mutex_lock(&vsp1->drm->lock);
>
> /* Enable the VSP1. */
> ret = vsp1_device_get(vsp1);
> @@ -758,6 +735,132 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> dev_dbg(vsp1->dev, "%s: pipeline enabled\n", __func__);
>
> return 0;
> +
> +}
> +EXPORT_SYMBOL_GPL(vsp1_du_atomic_enable);
> +
> +

Extra blank line.

> +/**
> + * vsp1_du_atomic_disable - Disable and stop a DU pipeline
> + * @dev: the VSP device
> + * @pipe_index: the DRM pipeline index
> + *
> + * The @pipe_index argument selects which DRM pipeline to disable. The number
> + * of available pipelines depend on the VSP instance.
> + *
> + * Return 0 on success or a negative error code on failure.
> + */
> +int vsp1_du_atomic_disable(struct device *dev, unsigned int pipe_index)
> +{
> + struct vsp1_device *vsp1 = dev_get_drvdata(dev);
> + struct vsp1_drm_pipeline *drm_pipe;
> + struct vsp1_pipeline *pipe;
> + struct vsp1_brx *brx;
> + unsigned int i;
> + int ret;
> +
> + if (pipe_index >= vsp1->info->lif_count)
> + return -EINVAL;
> +
> + drm_pipe = &vsp1->drm->pipe[pipe_index];
> + pipe = &drm_pipe->pipe;
> +
> + mutex_lock(&vsp1->drm->lock);
> +
> + brx = to_brx(&pipe->brx->subdev);
> +
> + /*
> + * NULL configuration means the CRTC is being disabled, stop
> + * the pipeline and turn the light off.
> + */

I think you can now drop this comment, or at least the first part of the
sentence.

> + ret = vsp1_pipeline_stop(pipe);
> + if (ret == -ETIMEDOUT)
> + dev_err(vsp1->dev, "DRM pipeline stop timeout\n");
> +
> + for (i = 0; i < ARRAY_SIZE(pipe->inputs); ++i) {
> + struct vsp1_rwpf *rpf = pipe->inputs[i];
> +
> + if (!rpf)
> + continue;
> +
> + /*
> + * Remove the RPF from the pipe and the list of BRx
> + * inputs.
> + */

This now holds on a single line.

> + WARN_ON(!rpf->entity.pipe);
> + rpf->entity.pipe = NULL;
> + list_del(&rpf->entity.list_pipe);
> + pipe->inputs[i] = NULL;
> +
> + brx->inputs[rpf->brx_input].rpf = NULL;
> + }
> +
> + drm_pipe->du_complete = NULL;
> + pipe->num_inputs = 0;
> +
> + dev_dbg(vsp1->dev, "%s: pipe %u: releasing %s\n",
> + __func__, pipe->lif->index,
> + BRX_NAME(pipe->brx));

And this can hold on two lines.

> +
> + list_del(&pipe->brx->list_pipe);
> + pipe->brx->pipe = NULL;
> + pipe->brx = NULL;
> +
> + mutex_unlock(&vsp1->drm->lock);
> +
> + vsp1_dlm_reset(pipe->output->dlm);
> + vsp1_device_put(vsp1);
> +
> + dev_dbg(vsp1->dev, "%s: pipeline disabled\n", __func__);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(vsp1_du_atomic_disable);
> +
> +/**
> + * vsp1_du_setup_lif - Setup the output part of the VSP pipeline
> + * @dev: the VSP device
> + * @pipe_index: the DRM pipeline index
> + * @cfg: the LIF configuration
> + *
> + * Configure the output part of VSP DRM pipeline for the given frame @cfg.width
> + * and @cfg.height. This sets up formats on the BRx source pad, the WPF sink and
> + * source pads, and the LIF sink pad.
> + *
> + * The @pipe_index argument selects which DRM pipeline to setup. The number of
> + * available pipelines depend on the VSP instance.
> + *
> + * As the media bus code on the blend unit source pad is conditioned by the
> + * configuration of its sink 0 pad, we also set up the formats on all blend unit
> + * sinks, even if the configuration will be overwritten later by
> + * vsp1_du_setup_rpf(). This ensures that the blend unit configuration is set to
> + * a well defined state.
> + *
> + * Return 0 on success or a negative error code on failure.
> + */
> +int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> + const struct vsp1_du_lif_config *cfg)
> +{
> + int ret;
> +
> + struct vsp1_du_modeset_config modes = {
> + .width = cfg->width,
> + .height = cfg->height,
> + .interlaced = cfg->interlaced,
> + };
> + struct vsp1_du_enable_config enable = {
> + .callback = cfg->callback,
> + .callback_data = cfg->callback_data,
> + };
> +
> + if (!cfg)
> + return vsp1_du_atomic_disable(dev, pipe_index);
> +
> + ret = vsp1_du_atomic_modeset(dev, pipe_index, &modes);
> + if (ret)
> + return ret;
> +
> + return vsp1_du_atomic_enable(dev, pipe_index, &enable);
> }
> EXPORT_SYMBOL_GPL(vsp1_du_setup_lif);
>
> diff --git a/include/media/vsp1.h b/include/media/vsp1.h
> index cc1b0d42ce95..13f5a1c4d45a 100644
> --- a/include/media/vsp1.h
> +++ b/include/media/vsp1.h
> @@ -21,7 +21,7 @@ int vsp1_du_init(struct device *dev);
> #define VSP1_DU_STATUS_WRITEBACK BIT(1)
>
> /**
> - * struct vsp1_du_lif_config - VSP LIF configuration
> + * struct vsp1_du_lif_config - VSP LIF configuration - Deprecated
> * @width: output frame width
> * @height: output frame height
> * @interlaced: true for interlaced pipelines
> @@ -42,6 +42,30 @@ struct vsp1_du_lif_config {
> int vsp1_du_setup_lif(struct device *dev, unsigned int pipe_index,
> const struct vsp1_du_lif_config *cfg);
>
> +/**
> + * struct vsp1_du_modeset_config - VSP LIF Mode configuration

Maybe "VSP display mode configuration" as it's not restricted to the LIF
?

> + * @width: output frame width
> + * @height: output frame height
> + * @interlaced: true for interlaced pipelines
> + */
> +struct vsp1_du_modeset_config {
> + unsigned int width;
> + unsigned int height;
> + bool interlaced;
> +};
> +
> +/**
> + * struct vsp1_du_enable_config - VSP enable configuration
> + * @callback: frame completion callback function (optional). When a callback
> + * is provided, the VSP driver guarantees that it will be called once
> + * and only once for each vsp1_du_atomic_flush() call.
> + * @callback_data: data to be passed to the frame completion callback
> + */
> +struct vsp1_du_enable_config {
> + void (*callback)(void *data, unsigned int status, u32 crc);
> + void *callback_data;
> +};
> +
> /**
> * struct vsp1_du_atomic_config - VSP atomic configuration parameters
> * @pixelformat: plane pixel format (V4L2 4CC)
> @@ -106,6 +130,12 @@ struct vsp1_du_atomic_pipe_config {
> struct vsp1_du_writeback_config writeback;
> };
>
> +
> +int vsp1_du_atomic_modeset(struct device *dev, unsigned int pipe_index,
> + const struct vsp1_du_modeset_config *cfg);
> +int vsp1_du_atomic_enable(struct device *dev, unsigned int pipe_index,
> + const struct vsp1_du_enable_config *cfg);
> +int vsp1_du_atomic_disable(struct device *dev, unsigned int pipe_index);
> void vsp1_du_atomic_begin(struct device *dev, unsigned int pipe_index);
> int vsp1_du_atomic_update(struct device *dev, unsigned int pipe_index,
> unsigned int rpf,

--
Regards,

Laurent Pinchart

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