linux-kernel - [PATCH 4.18 028/171] drm: rcar-du: Update Gen3 output limitations

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Message-Id: <20181119162624.350229116@linuxfoundation.org>
Date:   Mon, 19 Nov 2018 17:27:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.18 028/171] drm: rcar-du: Update Gen3 output limitations

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

[ Upstream commit 2a3181d9cfd6d5aa48f8527708d0c32072072cef ]

The R-Car Gen3 DU utilises the VSP1 hardware for memory access. The
limits on the RPF and WPF in this pipeline are 8190x8190.

Update the supported maximum sizes accordingly.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/rcar-du/rcar_du_kms.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -516,12 +516,22 @@ int rcar_du_modeset_init(struct rcar_du_
 
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;
-	dev->mode_config.max_width = 4095;
-	dev->mode_config.max_height = 2047;
 	dev->mode_config.normalize_zpos = true;
 	dev->mode_config.funcs = &rcar_du_mode_config_funcs;
 	dev->mode_config.helper_private = &rcar_du_mode_config_helper;
 
+	if (rcdu->info->gen < 3) {
+		dev->mode_config.max_width = 4095;
+		dev->mode_config.max_height = 2047;
+	} else {
+		/*
+		 * The Gen3 DU uses the VSP1 for memory access, and is limited
+		 * to frame sizes of 8190x8190.
+		 */
+		dev->mode_config.max_width = 8190;
+		dev->mode_config.max_height = 8190;
+	}
+
 	rcdu->num_crtcs = hweight8(rcdu->info->channels_mask);
 
 	ret = rcar_du_properties_init(rcdu);