drm/meson: overlay: setup overlay for Amlogic FBC Memory Saving mode

Setup the Amlogic FBC decoder for the VD1 video overlay plane to use
a different superblock size for the Memory Saving mode.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200703080728.25207-5-narmstrong@baylibre.com

diff --git a/drivers/gpu/drm/meson/meson_overlay.c b/drivers/gpu/drm/meson/meson_overlay.c
index 293f606..1566a88 100644 (file)
--- a/drivers/gpu/drm/meson/meson_overlay.c
+++ b/drivers/gpu/drm/meson/meson_overlay.c
@@ -486,6 +486,10 @@ static void meson_overlay_atomic_update(struct drm_plane *plane,
                                          AFBC_HOLD_LINE_NUM(8) |
                                          AFBC_BURST_LEN(2);
 
+               if (fb->modifier & DRM_FORMAT_MOD_AMLOGIC_FBC(0,
+                                               AMLOGIC_FBC_OPTION_MEM_SAVING))
+                       priv->viu.vd1_afbc_mode |= AFBC_BLK_MEM_MODE;
+
                priv->viu.vd1_afbc_en = 0x1600 | AFBC_DEC_ENABLE;
 
                priv->viu.vd1_afbc_conv_ctrl = AFBC_CONV_LBUF_LEN(256);
@@ -671,12 +675,17 @@ static void meson_overlay_atomic_update(struct drm_plane *plane,
        }
 
        if (priv->viu.vd1_afbc) {
+               /* Default mode is 4k per superblock */
+               unsigned long block_size = 4096;
                unsigned long body_size;
 
-               /* Default mode is 4k per superblock */
+               /* 8bit mem saving mode is 3072bytes per superblock */
+               if (priv->viu.vd1_afbc_mode & AFBC_BLK_MEM_MODE)
+                       block_size = 3072;
+
                body_size = (ALIGN(priv->viu.vd1_stride0, 64) / 64) *
                            (ALIGN(priv->viu.vd1_height0, 32) / 32) *
-                           4096;
+                           block_size;
 
                priv->viu.vd1_afbc_body_addr = priv->viu.vd1_addr0 >> 4;
 
@@ -734,6 +743,9 @@ static bool meson_overlay_format_mod_supported(struct drm_plane *plane,
                unsigned int layout = modifier &
                        DRM_FORMAT_MOD_AMLOGIC_FBC(
                                __fourcc_mod_amlogic_layout_mask, 0);
+               unsigned int options =
+                       (modifier >> __fourcc_mod_amlogic_options_shift) &
+                       __fourcc_mod_amlogic_options_mask;
 
                if (format != DRM_FORMAT_YUV420_8BIT &&
                    format != DRM_FORMAT_YUV420_10BIT) {
@@ -748,6 +760,13 @@ static bool meson_overlay_format_mod_supported(struct drm_plane *plane,
                        return false;
                }
 
+               if (options &&
+                   options != AMLOGIC_FBC_OPTION_MEM_SAVING) {
+                       DRM_DEBUG_KMS("%llx invalid layout %x\n",
+                                     modifier, layout);
+                       return false;
+               }
+
                return true;
        }
 
@@ -781,6 +800,8 @@ static const uint32_t supported_drm_formats[] = {
 };
 
 static const uint64_t format_modifiers[] = {
+       DRM_FORMAT_MOD_AMLOGIC_FBC(AMLOGIC_FBC_LAYOUT_BASIC,
+                                  AMLOGIC_FBC_OPTION_MEM_SAVING),
        DRM_FORMAT_MOD_AMLOGIC_FBC(AMLOGIC_FBC_LAYOUT_BASIC, 0),
        DRM_FORMAT_MOD_LINEAR,
        DRM_FORMAT_MOD_INVALID,