drm/nouveau: Advertise correct modifiers on GB20x

8 and 16 bit formats use a different layout on
GB20x than they did on prior chips. Add the
corresponding DRM format modifiers to the list of
modifiers supported by the display engine on such
chips, and filter the supported modifiers for each
format based on its bytes per pixel in
nv50_plane_format_mod_supported().

Note this logic will need to be updated when GB10
support is added, since it is a GB20x chip that
uses the pre-GB20x sector layout for all formats.

Fixes: 6cc6e08 ("drm/nouveau/kms: add support for GB20x")
Signed-off-by: James Jones <[email protected]>
Reviewed-by: Faith Ekstrand <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Cc: [email protected]
Link: https://patch.msgid.link/[email protected]

Author: cubanismo

drivers/gpu/drm/nouveau/dispnv50/disp.c

@@ -2867,7 +2867,9 @@ nv50_display_create(struct drm_device *dev)
 	}
 
 	/* Assign the correct format modifiers */
-	if (disp->disp->object.oclass >= TU102_DISP)
+	if (disp->disp->object.oclass >= GB202_DISP)
+		nouveau_display(dev)->format_modifiers = wndwca7e_modifiers;
+	else if (disp->disp->object.oclass >= TU102_DISP)
 		nouveau_display(dev)->format_modifiers = wndwc57e_modifiers;
 	else
 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_FERMI)

drivers/gpu/drm/nouveau/dispnv50/disp.h

@@ -104,4 +104,5 @@ struct nouveau_encoder *nv50_real_outp(struct drm_encoder *encoder);
 extern const u64 disp50xx_modifiers[];
 extern const u64 disp90xx_modifiers[];
 extern const u64 wndwc57e_modifiers[];
+extern const u64 wndwca7e_modifiers[];
 #endif

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -786,27 +786,47 @@ nv50_wndw_destroy(struct drm_plane *plane)
 }
 
 /* This function assumes the format has already been validated against the plane
- * and the modifier was validated against the device-wides modifier list at FB
+ * and the modifier was validated against the device-wide modifier list at FB
  * creation time.
  */
 static bool nv50_plane_format_mod_supported(struct drm_plane *plane,
 					    u32 format, u64 modifier)
 {
 	struct nouveau_drm *drm = nouveau_drm(plane->dev);
+	const struct drm_format_info *info = drm_format_info(format);
 	uint8_t i;
 
 	/* All chipsets can display all formats in linear layout */
 	if (modifier == DRM_FORMAT_MOD_LINEAR)
 		return true;
 
 	if (drm->client.device.info.chipset < 0xc0) {
-		const struct drm_format_info *info = drm_format_info(format);
 		const uint8_t kind = (modifier >> 12) & 0xff;
 
 		if (!format) return false;
 
 		for (i = 0; i < info->num_planes; i++)
 			if ((info->cpp[i] != 4) && kind != 0x70) return false;
+	} else if (drm->client.device.info.chipset >= 0x1b2) {
+		const uint8_t slayout = ((modifier >> 22) & 0x1) |
+			((modifier >> 25) & 0x6);
+
+		if (!format)
+			return false;
+
+		/*
+		 * Note in practice this implies only formats where cpp is equal
+		 * for each plane, or >= 4 for all planes, are supported.
+		 */
+		for (i = 0; i < info->num_planes; i++) {
+			if (((info->cpp[i] == 2) && slayout != 3) ||
+			    ((info->cpp[i] == 1) && slayout != 2) ||
+			    ((info->cpp[i] >= 4) && slayout != 1))
+				return false;
+
+			/* 24-bit not supported. It has yet another layout */
+			WARN_ON(info->cpp[i] == 3);
+		}
 	}
 
 	return true;

drivers/gpu/drm/nouveau/dispnv50/wndwca7e.c

@@ -179,6 +179,39 @@ wndwca7e_ntfy_set(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw)
 	return 0;
 }
 
+/****************************************************************
+ *            Log2(block height) ----------------------------+  *
+ *            Page Kind ----------------------------------+  |  *
+ *            Gob Height/Page Kind Generation ------+     |  |  *
+ *                          Sector layout -------+  |     |  |  *
+ *                          Compression ------+  |  |     |  |  */
+const u64 wndwca7e_modifiers[] = { /*         |  |  |     |  |  */
+	/* 4cpp+ modifiers */
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 2, 0x06, 0),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 2, 0x06, 1),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 2, 0x06, 2),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 2, 0x06, 3),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 2, 0x06, 4),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 1, 2, 0x06, 5),
+	/* 1cpp/8bpp modifiers */
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 2, 2, 0x06, 0),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 2, 2, 0x06, 1),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 2, 2, 0x06, 2),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 2, 2, 0x06, 3),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 2, 2, 0x06, 4),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 2, 2, 0x06, 5),
+	/* 2cpp/16bpp modifiers */
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 3, 2, 0x06, 0),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 3, 2, 0x06, 1),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 3, 2, 0x06, 2),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 3, 2, 0x06, 3),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 3, 2, 0x06, 4),
+	DRM_FORMAT_MOD_NVIDIA_BLOCK_LINEAR_2D(0, 3, 2, 0x06, 5),
+	/* All formats support linear */
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
 static const struct nv50_wndw_func
 wndwca7e = {
 	.acquire = wndwc37e_acquire,