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From:   Brian Norris <briannorris@chromium.org>
To:     =?UTF-8?q?Heiko=20St=C3=BCbner?= <heiko@sntech.de>
Cc:     Sandy Huang <hjc@rock-chips.com>,
        linux-arm-kernel@lists.infradead.org,
        Andrzej Pietrasiewicz <andrzej.p@collabora.com>,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        Brian Norris <briannorris@chromium.org>
Subject: [PATCH] drm/rockchip: vop: Quiet always-warning AFBC log
Date:   Mon, 31 Oct 2022 10:16:01 -0700
Message-Id: <20221031101557.1.Ic1569d394173c1c3016142fee4bb87a09753db94@changeid>
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The downstream code from which this was derived didn't ever run through
this 'switch' block with non-AFBC formats, but the upstream code does --
we use this function to probe whether a given format is supported.

Demote the warning to eliminate this sort of warning seen on every
boot:

  [drm] unsupported AFBC format[3231564e]

And make it warn more than once, because if we *actually* care to see
what formats we're probing/rejecting and for what reasons, we probably
care about more than just the first message.

Drop the comment, because one of the two *is* commonly reachable.

And lastly, drop the unreachable return; we'd do better to let the
compiler complain if we start hitting this unexpectedly.

Signed-off-by: Brian Norris <briannorris@chromium.org>
---

 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index fa1f4ee6d195..aab77eb6caa3 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -316,13 +316,10 @@ static int vop_convert_afbc_format(uint32_t format)
 	case DRM_FORMAT_RGB565:
 	case DRM_FORMAT_BGR565:
 		return AFBC_FMT_RGB565;
-	/* either of the below should not be reachable */
 	default:
-		DRM_WARN_ONCE("unsupported AFBC format[%08x]\n", format);
+		DRM_DEBUG_KMS("unsupported AFBC format[%08x]\n", format);
 		return -EINVAL;
 	}
-
-	return -EINVAL;
 }
 
 static uint16_t scl_vop_cal_scale(enum scale_mode mode, uint32_t src,
-- 
2.38.1.273.g43a17bfeac-goog