linux-kernel - [PATCH 2/2] drm: sun4i: tcon: Mark expected switch fall-through

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Date:   Fri, 26 Jul 2019 13:28:07 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     airlied@...ux.ie, daniel@...ll.ch, wens@...e.org
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH 2/2] drm: sun4i: tcon: Mark expected switch fall-through

When fall-through warnings was enabled by default the following warning
was starting to show up:

../drivers/gpu/drm/sun4i/sun4i_tcon.c: In function ‘sun4i_tcon0_mode_set_dithering’:
../drivers/gpu/drm/sun4i/sun4i_tcon.c:316:7: warning: this statement may fall
 through [-Wimplicit-fallthrough=]
   val |= SUN4I_TCON0_FRM_CTL_MODE_B;
../drivers/gpu/drm/sun4i/sun4i_tcon.c:317:2: note: here
  case MEDIA_BUS_FMT_RGB666_1X18:
  ^~~~

Rework so that the compiler doesn't warn about fall-through.

Fixes: d93512ef0f0e ("Makefile: Globally enable fall-through warning")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 690aeb822704..04c721d0d3b9 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -316,6 +316,7 @@ static void sun4i_tcon0_mode_set_dithering(struct sun4i_tcon *tcon,
 		/* R and B components are only 5 bits deep */
 		val |= SUN4I_TCON0_FRM_CTL_MODE_R;
 		val |= SUN4I_TCON0_FRM_CTL_MODE_B;
+		/* Fall through */
 	case MEDIA_BUS_FMT_RGB666_1X18:
 	case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 		/* Fall through: enable dithering */
-- 
2.20.1