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Subject[PATCH 2/2] drm/fsl-dcu: introduce kernel parameter to specify fbdev depth
Date
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>
---
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)

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 c3c9349..537ca15 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)
@@ -85,7 +88,18 @@ 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:
--
2.10.2
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