On Wed, Sep 4, 2019 at 9:58 PM Souza, Jose jose.souza@intel.com wrote:
On Wed, 2019-09-04 at 16:39 +0200, Daniel Vetter wrote:
- it's what we recommend in our docs:
https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html#recommended-ioctl-ret...
- it's the overwhelmingly used error code for "operation not supported", at least in drm core (slightly less so in drivers):
$ git grep EOPNOTSUP -- drivers/gpu/drm/*c | wc -l 83 $ git grep ENOTSUP -- drivers/gpu/drm/*c | wc -l 5
- include/linux/errno.h makes it fairly clear that these are for
nfsv3 (plus they also have error codes above 512, which is the block with some special behaviour ...)
/* Defined for the NFSv3 protocol */
If the above isn't reflecting current practice, then I guess we should at least update the docs.
Hopefully this will not break any userspace
None of the functions in drm_edid.c affected by this reach userspace, it's all driver internal.
Same for the mipi function, that error code should be handled by drivers. Drivers are supposed to remap "the hw is on fire" to EIO when reporting up to userspace, but I think if a driver sees this it would be a driver bug.
So no way this goes out to userspace, I really only did this to have the drm core/helpers be 100% consistent with our documented recommendations here.
I'll summarize the above in the commit message when I merge the patch.
Reviewed-by: José Roberto de Souza jose.souza@intel.com
Thanks, Daniel
Cc: José Roberto de Souza jose.souza@intel.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: Sean Paul sean@poorly.run Cc: Alex Deucher alexander.deucher@amd.com Cc: Andres Rodriguez andresx7@gmail.com Cc: Noralf Trønnes noralf@tronnes.org Signed-off-by: Daniel Vetter daniel.vetter@intel.com
drivers/gpu/drm/drm_edid.c | 6 +++--- drivers/gpu/drm/drm_mipi_dbi.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 82a4ceed3fcf..12c783f4d956 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3719,7 +3719,7 @@ cea_db_offsets(const u8 *cea, int *start, int *end) if (*end < 4 || *end > 127) return -ERANGE; } else {
return -ENOTSUPP;
return -EOPNOTSUPP; } return 0;@@ -4188,7 +4188,7 @@ int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
if (cea_revision(cea) < 3) { DRM_DEBUG_KMS("SAD: wrong CEA revision\n");
return -ENOTSUPP;
return -EOPNOTSUPP; } if (cea_db_offsets(cea, &start, &end)) {@@ -4249,7 +4249,7 @@ int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb)
if (cea_revision(cea) < 3) { DRM_DEBUG_KMS("SAD: wrong CEA revision\n");
return -ENOTSUPP;
return -EOPNOTSUPP; } if (cea_db_offsets(cea, &start, &end)) {diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c index c4ee2709a6f3..f8154316a3b0 100644 --- a/drivers/gpu/drm/drm_mipi_dbi.c +++ b/drivers/gpu/drm/drm_mipi_dbi.c @@ -955,7 +955,7 @@ static int mipi_dbi_typec1_command(struct mipi_dbi *dbi, u8 *cmd, int ret;
if (mipi_dbi_command_is_read(dbi, *cmd))
return -ENOTSUPP;
return -EOPNOTSUPP; MIPI_DBI_DEBUG_COMMAND(*cmd, parameters, num);