| Message ID | 20220426114627.1.I2dd93486c6952bd52f2020904de0133970d11b29@changeid (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] drm/probe-helper: Add helper for drm_helper_probe_single_connector_modes() | expand |
On 4/26/2022 11:46 AM, Douglas Anderson wrote: > 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@chromium.org> I think this cleanup looks reasonable to me. Hence, Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> > --- > > 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, > + 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; > + } > + > + 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:
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@chromium.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:
Hi, On Thu, May 5, 2022 at 11:34 AM Thomas Zimmermann <tzimmermann@suse.de> wrote: > > 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@chromium.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. Sure! I'll spin with this. > > + 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. There's a madness to my method. I originally had it returning "ret" but then I felt like the callers now needed to handle three cases: a) ret = -EDEADLK b) ret = 0 c) ret = some other error In reality _drm_helper_update_and_validate() never returned anything other than a) or b), so adding the extra error handling for c) seemed like a waste. ...but it also felt like if it violated the abstraction of _drm_helper_update_and_validate() returning an error code if I didn't handle c). In any case, I'll change it back to an error code. Maybe a compromise would be: ret = _drm_helper_update_and_validate(...) if (ret == -EDEADLK) { drm_modeset_backoff(...) goto retry; } WARN_ON(ret); ...so we at least document that ret can only be one of the two values and we'll get a warning splat if it ever happens, but we don't need to add complex error handling for a case that the code can't hit. Ah, looking above I guess that matches what the function does earlier too. OK, I'll give a few more days for feedback on this series and I'll spin with the two changes you've requested. -Doug -Doug
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, + 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; + } + + 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:
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@chromium.org> --- drivers/gpu/drm/drm_probe_helper.c | 105 ++++++++++++++++------------- 1 file changed, 59 insertions(+), 46 deletions(-)