[PATCH 4.19 33/44] drm/i915: always return something on DDI clock selection

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>

commit 2a121030d4ee3f84f60c6f415f9c44bffbcde81d upstream.

Even if we don't have the correct clock and get a warning, we should not
skip the return.

v2: improve commit message (from Joonas)

Fixes: 1fa11ee2d9d0 ("drm/i915/icl: start adding the TBT pll")
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.19+
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Reviewed-by: Mika Kahola <mika.kahola@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20190125222444.19926-3-lucas.demarchi@xxxxxxxxx
(cherry picked from commit 7a61a6dec3dfb9f2e8c39a337580a3c3036c5cdf)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/intel_ddi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1085,7 +1085,7 @@ static uint32_t icl_pll_to_ddi_pll_sel(s
 			return DDI_CLK_SEL_TBT_810;
 		default:
 			MISSING_CASE(clock);
-			break;
+			return DDI_CLK_SEL_NONE;
 		}
 	case DPLL_ID_ICL_MGPLL1:
 	case DPLL_ID_ICL_MGPLL2: