linux-kernel - [PATCH v5 5/8] drm/fourcc: amlogic: Add modifier definitions for Memory Saving option

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Message-Id: <20200416152500.29429-6-narmstrong@baylibre.com>
Date:   Thu, 16 Apr 2020 17:24:57 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     daniel@...ll.ch, dri-devel@...ts.freedesktop.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Kevin Hilman <khilman@...libre.com>
Subject: [PATCH v5 5/8] drm/fourcc: amlogic: Add modifier definitions for Memory Saving option

Amlogic uses a proprietary lossless image compression protocol and format
for their hardware video codec accelerators, either video decoders or
video input encoders.

An option exist changing the layout superblock size to save memory when
using 8bit components pixels size.

Tested-by: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 include/uapi/drm/drm_fourcc.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index a1b163a5641f..664dd238574a 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -843,6 +843,21 @@ extern "C" {
  */
 #define DRM_FORMAT_MOD_AMLOGIC_FBC_LAYOUT_BASIC		(1ULL << 0)
 
+/* Amlogic FBC Layout Options */
+#define DRM_FORMAT_MOD_AMLOGIC_FBC_OPTIONS_MASK		(0xf << 8)
+
+/*
+ * Amlogic FBC Memory Saving mode
+ *
+ * Indicates the storage is packed when pixel size is multiple of word
+ * boudaries, i.e. 8bit should be stored in this mode to save allocation
+ * memory.
+ *
+ * This mode reduces body layout to 3072 bytes per 64x32 superblock with
+ * the basic layout.
+ */
+#define DRM_FORMAT_MOD_AMLOGIC_FBC_MEM_SAVING	(1ULL << 8)
+
 #if defined(__cplusplus)
 }
 #endif
-- 
2.22.0