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

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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>
This commit is contained in:
Stefan Agner 2016-11-16 17:23:27 -08:00
parent c162215f57
commit 73fe26a486
1 changed files with 15 additions and 1 deletions
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16
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
View file

@ -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: