Hi,
On 10/26/21 08:34, Igor Torrente wrote:
> Add a helper function to validate the connector configuration receive in
> the encoder atomic_check by the drivers.
>
> So the drivers don't need do these common validations themselves.
>
> Signed-off-by: Igor Torrente <igormtorre...@gmail.com>
> ---
> V2: Move the format verification to a new helper at the drm_atomic_helper.c
> (Thomas Zimmermann).
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 47 +++++++++++++++++++++++++++
> drivers/gpu/drm/vkms/vkms_writeback.c | 9 +++--
> include/drm/drm_atomic_helper.h | 3 ++
> 3 files changed, 54 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> b/drivers/gpu/drm/drm_atomic_helper.c
> index 2c0c6ec92820..c2653b9824b5 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -766,6 +766,53 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
> }
> EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
>
> +/**
> + * drm_atomic_helper_check_wb_connector_state() - Check writeback encoder
> state
> + * @encoder: encoder state to check
> + * @conn_state: connector state to check
> + *
> + * Checks if the wriback connector state is valid, and returns a erros if it
> + * isn't.
> + *
> + * RETURNS:
> + * Zero for success or -errno
> + */
> +int
> +drm_atomic_helper_check_wb_encoder_state(struct drm_encoder *encoder,
> + struct drm_connector_state *conn_state)
> +{
> + struct drm_writeback_job *wb_job = conn_state->writeback_job;
> + struct drm_property_blob *pixel_format_blob;
> + bool format_supported = false;
> + struct drm_framebuffer *fb;
> + int i, n_formats;
> + u32 *formats;
> +
> + if (!wb_job || !wb_job->fb)
> + return 0;
I think that this should be removed and that this functions should
assume that (wb_job && wb_job->fb) == true.
Actually, it's weird to have conn_state as argument and only use it to
get the wb_job. Instead, this function could receive wb_job directly.
Of course, its name/description would have to change.
> +
> + pixel_format_blob = wb_job->connector->pixel_formats_blob_ptr;
> + n_formats = pixel_format_blob->length / sizeof(u32);
> + formats = pixel_format_blob->data;
> + fb = wb_job->fb;
> +
> + for (i = 0; i < n_formats; i++) {
> + if (fb->format->format == formats[i]) {
> + format_supported = true;
> + break;
> + }
> + }
> +
> + if (!format_supported) {
> + DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> + &fb->format->format);
> + return -EINVAL;
> + }
> +
> + return 0;
If you do this, you can get rid of the format_supported flag:
for(...) {
if (fb->format->format == formats[i])
return 0;
}
DRM_DEBUG_KMS(...);
return -EINVAL;
Thanks,
Leandro Ribeiro
> +}
> +EXPORT_SYMBOL(drm_atomic_helper_check_wb_encoder_state);
> +
> /**
> * drm_atomic_helper_check_plane_state() - Check plane state for validity
> * @plane_state: plane state to check
> diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c
> b/drivers/gpu/drm/vkms/vkms_writeback.c
> index 32734cdbf6c2..42f3396c523a 100644
> --- a/drivers/gpu/drm/vkms/vkms_writeback.c
> +++ b/drivers/gpu/drm/vkms/vkms_writeback.c
> @@ -30,6 +30,7 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder
> *encoder,
> {
> struct drm_framebuffer *fb;
> const struct drm_display_mode *mode = &crtc_state->mode;
> + int ret;
>
> if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
> return 0;
> @@ -41,11 +42,9 @@ static int vkms_wb_encoder_atomic_check(struct drm_encoder
> *encoder,
> return -EINVAL;
> }
>
> - if (fb->format->format != vkms_wb_formats[0]) {
> - DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
> - &fb->format->format);
> - return -EINVAL;
> - }
> + ret = drm_atomic_helper_check_wb_encoder_state(encoder, conn_state);
> + if (ret < 0)
> + return ret;
>
> return 0;
> }
> diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
> index 4045e2507e11..3fbf695da60f 100644
> --- a/include/drm/drm_atomic_helper.h
> +++ b/include/drm/drm_atomic_helper.h
> @@ -40,6 +40,9 @@ struct drm_private_state;
>
> int drm_atomic_helper_check_modeset(struct drm_device *dev,
> struct drm_atomic_state *state);
> +int
> +drm_atomic_helper_check_wb_encoder_state(struct drm_encoder *encoder,
> + struct drm_connector_state
> *conn_state);
> int drm_atomic_helper_check_plane_state(struct drm_plane_state *plane_state,
> const struct drm_crtc_state *crtc_state,
> int min_scale,
>
