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Date: Thu, 5 May 2022 20:34:28 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Douglas Anderson <dianders@...omium.org>,
dri-devel@...ts.freedesktop.org
Cc: quic_sbillaka@...cinc.com, David Airlie <airlied@...ux.ie>,
linux-arm-msm@...r.kernel.org, quic_abhinavk@...cinc.com,
quic_khsieh@...cinc.com, dmitry.baryshkov@...aro.org,
quic_aravindh@...cinc.com, swboyd@...omium.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/probe-helper: Add helper for
drm_helper_probe_single_connector_modes()
Hi
Am 26.04.22 um 20:46 schrieb Douglas Anderson:
> The drm_helper_probe_single_connector_modes() is a bit long. Let's
> break a chunk off to update and validate modes. This helps avoid one
> goto and also will allow us to more easily call the helper a second
> time in a future patch without adding looping or another goto.
>
> This change is intended to be a no-op change--just code movement.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
> drivers/gpu/drm/drm_probe_helper.c | 105 ++++++++++++++++-------------
> 1 file changed, 59 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
> index 682359512996..819225629010 100644
> --- a/drivers/gpu/drm/drm_probe_helper.c
> +++ b/drivers/gpu/drm/drm_probe_helper.c
> @@ -354,6 +354,61 @@ drm_helper_probe_detect(struct drm_connector *connector,
> }
> EXPORT_SYMBOL(drm_helper_probe_detect);
>
> +static bool _drm_helper_update_and_validate(struct drm_connector *connector,
AFAIK convention is to use two underscores for internal names.
> + uint32_t maxX, uint32_t maxY,
> + struct drm_modeset_acquire_ctx *ctx)
> +{
> + struct drm_device *dev = connector->dev;
> + struct drm_display_mode *mode;
> + int mode_flags = 0;
> + int ret;
> +
> + drm_connector_list_update(connector);
> +
> + if (connector->interlace_allowed)
> + mode_flags |= DRM_MODE_FLAG_INTERLACE;
> + if (connector->doublescan_allowed)
> + mode_flags |= DRM_MODE_FLAG_DBLSCAN;
> + if (connector->stereo_allowed)
> + mode_flags |= DRM_MODE_FLAG_3D_MASK;
> +
> + list_for_each_entry(mode, &connector->modes, head) {
> + if (mode->status != MODE_OK)
> + continue;
> +
> + mode->status = drm_mode_validate_driver(dev, mode);
> + if (mode->status != MODE_OK)
> + continue;
> +
> + mode->status = drm_mode_validate_size(mode, maxX, maxY);
> + if (mode->status != MODE_OK)
> + continue;
> +
> + mode->status = drm_mode_validate_flag(mode, mode_flags);
> + if (mode->status != MODE_OK)
> + continue;
> +
> + ret = drm_mode_validate_pipeline(mode, connector, ctx,
> + &mode->status);
> + if (ret) {
> + drm_dbg_kms(dev,
> + "drm_mode_validate_pipeline failed: %d\n",
> + ret);
> +
> + if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK))
> + mode->status = MODE_ERROR;
> + else
> + return true;
Returning true is non-intuitive. It looks as if we report success when
it actually signals a retry.
I suggest to return 'ret' here and let the caller decide. On success at
the end of the function, it would return 0 as usual.
Best regards
Thomas
> + }
> +
> + if (mode->status != MODE_OK)
> + continue;
> + mode->status = drm_mode_validate_ycbcr420(mode, connector);
> + }
> +
> + return false;
> +}
> +
> /**
> * drm_helper_probe_single_connector_modes - get complete set of display modes
> * @connector: connector to probe
> @@ -421,7 +476,6 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> const struct drm_connector_helper_funcs *connector_funcs =
> connector->helper_private;
> int count = 0, ret;
> - int mode_flags = 0;
> bool verbose_prune = true;
> enum drm_connector_status old_status;
> struct drm_modeset_acquire_ctx ctx;
> @@ -519,52 +573,11 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
> connector->status == connector_status_unknown))
> count = drm_add_modes_noedid(connector, 1024, 768);
> count += drm_helper_probe_add_cmdline_mode(connector);
> - if (count == 0)
> - goto prune;
> -
> - drm_connector_list_update(connector);
> -
> - if (connector->interlace_allowed)
> - mode_flags |= DRM_MODE_FLAG_INTERLACE;
> - if (connector->doublescan_allowed)
> - mode_flags |= DRM_MODE_FLAG_DBLSCAN;
> - if (connector->stereo_allowed)
> - mode_flags |= DRM_MODE_FLAG_3D_MASK;
> -
> - list_for_each_entry(mode, &connector->modes, head) {
> - if (mode->status != MODE_OK)
> - continue;
> -
> - mode->status = drm_mode_validate_driver(dev, mode);
> - if (mode->status != MODE_OK)
> - continue;
> -
> - mode->status = drm_mode_validate_size(mode, maxX, maxY);
> - if (mode->status != MODE_OK)
> - continue;
> -
> - mode->status = drm_mode_validate_flag(mode, mode_flags);
> - if (mode->status != MODE_OK)
> - continue;
> -
> - ret = drm_mode_validate_pipeline(mode, connector, &ctx,
> - &mode->status);
> - if (ret) {
> - drm_dbg_kms(dev,
> - "drm_mode_validate_pipeline failed: %d\n",
> - ret);
> -
> - if (drm_WARN_ON_ONCE(dev, ret != -EDEADLK)) {
> - mode->status = MODE_ERROR;
> - } else {
> - drm_modeset_backoff(&ctx);
> - goto retry;
> - }
> + if (count != 0) {
> + if (_drm_helper_update_and_validate(connector, maxX, maxY, &ctx)) {
> + drm_modeset_backoff(&ctx);
> + goto retry;
> }
> -
> - if (mode->status != MODE_OK)
> - continue;
> - mode->status = drm_mode_validate_ycbcr420(mode, connector);
> }
>
> prune:
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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