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Commit 73fe26a4 authored by Stefan Agner's avatar Stefan Agner
Browse files

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: default avatarStefan Agner <stefan@agner.ch>
parent c162215f

drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

+15 −1
Original line number Diff line number Diff line
@@ -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: