From: Stefan Agner <stefan@agner.ch>
Date: Thu, 17 Nov 2016 01:23:27 +0000 (-0800)
Subject: drm/fsl-dcu: introduce kernel parameter to specify fbdev depth
X-Git-Tag: v4.10-rc1~154^2~5^2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=73fe26a48659abd2b85d2f87d3cf2400ddb313d7;p=karo-tx-linux.git

drm/fsl-dcu: introduce kernel parameter to specify fbdev depth

Add a kernel parameter legancyfb_depth (like the i.MX drm driver)
to control the legancy fbdev depth. Default to the so far hard
coded depth of 24-bit. Currently changing the framebuffer depth
is not possible from user space when using the fbdev emulation
layer... This provides a rudimentary mechanism to change depth
without having to change kernel code.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 736451616ce4..58ccacaf5a4e 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -32,6 +32,9 @@
 #include "fsl_dcu_drm_drv.h"
 #include "fsl_tcon.h"
 
+static int legacyfb_depth = 24;
+module_param(legacyfb_depth, int, 0444);
+
 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
 {
 	if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
@@ -87,7 +90,18 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
 		goto done;
 	dev->irq_enabled = true;
 
-	fsl_dev->fbdev = drm_fbdev_cma_init(dev, 24, 1, 1);
+	if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
+	    legacyfb_depth != 32) {
+		dev_warn(dev->dev,
+			"Invalid legacyfb_depth.  Defaulting to 24bpp\n");
+		legacyfb_depth = 24;
+	}
+	fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1, 1);
+	if (IS_ERR(fsl_dev->fbdev)) {
+		ret = PTR_ERR(fsl_dev->fbdev);
+		fsl_dev->fbdev = NULL;
+		goto done;
+	}
 
 	return 0;
 done: