On Tue, 23 May 2023, Jani Nikula <jani.nik...@linux.intel.com> wrote: > On Tue, 23 May 2023, Tom Rix <t...@redhat.com> wrote: >> clang with W=1 reports >> drivers/gpu/drm/i915/display/intel_display.c:6012:3: error: unannotated >> fall-through between switch labels [-Werror,-Wimplicit-fallthrough] >> case I915_FORMAT_MOD_X_TILED: >> ^ >> >> Only one case and the default does anything in this switch, so it should >> be changed to an if-elseif. > > Thanks for the patch. > > If I wanted to fix this quickly, I'd just add the break in there.
I've just applied [1] doing this. I'm still open to the cleanup suggested below, if you're up for it. BR, Jani. [1] https://patchwork.freedesktop.org/patch/msgid/20230524-intel_async_flip_check_hw-implicit-fallthrough-v1-1-83de89e37...@kernel.org > > If I wanted to fix this properly, I'd add a function > modifier_supports_async_flips() or something, and replace the switch > with: > > if (!modifier_supports_async_flips(i915, > new_plane_state->hw.fb->modifier)) { > drm_dbg_kms(&i915->drm, "[PLANE:%d:%s] Modifier does not > support async flips\n", > plane->base.base.id, plane->base.name); > return -EINVAL; > } > > But I wouldn't just replace the switch with if-elseif. It doesn't help > with the overall feeling that intel_async_flip_check_hw() is too long. > > BR, > Jani. > > >> >> Signed-off-by: Tom Rix <t...@redhat.com> >> --- >> drivers/gpu/drm/i915/display/intel_display.c | 14 +++++--------- >> 1 file changed, 5 insertions(+), 9 deletions(-) >> >> diff --git a/drivers/gpu/drm/i915/display/intel_display.c >> b/drivers/gpu/drm/i915/display/intel_display.c >> index 0490c6412ab5..1f852e49fc20 100644 >> --- a/drivers/gpu/drm/i915/display/intel_display.c >> +++ b/drivers/gpu/drm/i915/display/intel_display.c >> @@ -5994,8 +5994,7 @@ static int intel_async_flip_check_hw(struct >> intel_atomic_state *state, struct in >> * Need to verify this for all gen9 platforms to enable >> * this selectively if required. >> */ >> - switch (new_plane_state->hw.fb->modifier) { >> - case DRM_FORMAT_MOD_LINEAR: >> + if (new_plane_state->hw.fb->modifier == DRM_FORMAT_MOD_LINEAR) { >> /* >> * FIXME: Async on Linear buffer is supported on ICL as >> * but with additional alignment and fbc restrictions >> @@ -6008,13 +6007,10 @@ static int intel_async_flip_check_hw(struct >> intel_atomic_state *state, struct in >> plane->base.base.id, >> plane->base.name); >> return -EINVAL; >> } >> - >> - case I915_FORMAT_MOD_X_TILED: >> - case I915_FORMAT_MOD_Y_TILED: >> - case I915_FORMAT_MOD_Yf_TILED: >> - case I915_FORMAT_MOD_4_TILED: >> - break; >> - default: >> + } else if (!(new_plane_state->hw.fb->modifier == >> I915_FORMAT_MOD_X_TILED || >> + new_plane_state->hw.fb->modifier == >> I915_FORMAT_MOD_Y_TILED || >> + new_plane_state->hw.fb->modifier == >> I915_FORMAT_MOD_Yf_TILED || >> + new_plane_state->hw.fb->modifier == >> I915_FORMAT_MOD_4_TILED)) { >> drm_dbg_kms(&i915->drm, >> "[PLANE:%d:%s] Modifier does not support >> async flips\n", >> plane->base.base.id, plane->base.name); -- Jani Nikula, Intel Open Source Graphics Center
