linux-kernel - [PATCH 03/11] drm/mxsfb: Add max-res property for MXSFB

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Date:   Wed, 16 Jan 2019 11:48:41 +0000
From:   Robert Chiras <robert.chiras@....com>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Marek Vasut <marex@...x.de>
CC:     Robert Chiras <robert.chiras@....com>,
        Stefan Agner <stefan@...er.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        David Airlie <airlied@...ux.ie>,
        Anson Huang <anson.huang@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 03/11] drm/mxsfb: Add max-res property for MXSFB

Because of stability issues, we may want to limit the maximum resolution
supported by the MXSFB (eLCDIF) driver.
This patch add support for a new property which we can use to impose such
limitation.

Signed-off-by: Robert Chiras <robert.chiras@....com>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 9a73564..c0b6198 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -201,6 +201,7 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 	struct platform_device *pdev = to_platform_device(drm->dev);
 	struct mxsfb_drm_private *mxsfb;
 	struct resource *res;
+	u32 max_res[2] = {0, 0};
 	int ret;
 
 	mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
@@ -279,10 +280,17 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 		}
 	}
 
+	of_property_read_u32_array(drm->dev->of_node, "max-res",
+				   &max_res[0], 2);
+	if (!max_res[0])
+		max_res[0] = MXSFB_MAX_XRES;
+	if (!max_res[1])
+		max_res[1] = MXSFB_MAX_YRES;
+
 	drm->mode_config.min_width	= MXSFB_MIN_XRES;
 	drm->mode_config.min_height	= MXSFB_MIN_YRES;
-	drm->mode_config.max_width	= MXSFB_MAX_XRES;
-	drm->mode_config.max_height	= MXSFB_MAX_YRES;
+	drm->mode_config.max_width	= max_res[0];
+	drm->mode_config.max_height	= max_res[1];
 	drm->mode_config.funcs		= &mxsfb_mode_config_funcs;
 	drm->mode_config.helper_private	= &mxsfb_mode_config_helpers;
 
-- 
2.7.4