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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>
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c162215f57
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1 changed files with 15 additions and 1 deletions
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@ -32,6 +32,9 @@
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#include "fsl_dcu_drm_drv.h"
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#include "fsl_tcon.h"
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static int legacyfb_depth = 24;
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module_param(legacyfb_depth, int, 0444);
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static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
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@ -87,7 +90,18 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
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goto done;
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dev->irq_enabled = true;
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fsl_dev->fbdev = drm_fbdev_cma_init(dev, 24, 1, 1);
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if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
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legacyfb_depth != 32) {
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dev_warn(dev->dev,
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"Invalid legacyfb_depth. Defaulting to 24bpp\n");
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legacyfb_depth = 24;
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}
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fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1, 1);
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if (IS_ERR(fsl_dev->fbdev)) {
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ret = PTR_ERR(fsl_dev->fbdev);
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fsl_dev->fbdev = NULL;
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goto done;
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}
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return 0;
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done:
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