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staging: drm/omap: add ywrap module param 

Can be set at boot or module load time to prevent YWRAP scrolling from
being enabled.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rob Clark 2011-12-15 21:05:15 -06:00 committed by Greg Kroah-Hartman
parent 0156bb3ea7
commit 510d4d32f2
1 changed files with 10 additions and 5 deletions
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15
drivers/staging/omapdrm/omap_fbdev.c
View File

@ -22,6 +22,10 @@
#include "drm_crtc.h"
#include "drm_fb_helper.h"
MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
static bool ywrap_enabled = true;
module_param_named(ywrap, ywrap_enabled, bool, 0644);
/*
* fbdev funcs, to implement legacy fbdev interface on top of drm driver
*/
@ -32,6 +36,7 @@ struct omap_fbdev {
struct drm_fb_helper base;
struct drm_framebuffer *fb;
struct drm_gem_object *bo;
bool ywrap_enabled;
};
static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
@ -75,14 +80,12 @@ static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
{
struct drm_fb_helper *helper = get_fb(fbi);
struct omap_fbdev *fbdev = to_omap_fbdev(helper);
struct omap_drm_private *priv;
int npages;
if (!helper)
goto fallback;
priv = helper->dev->dev_private;
if (!priv->has_dmm)
if (!fbdev->ywrap_enabled)
goto fallback;
/* DMM roll shifts in 4K pages: */
@ -152,7 +155,8 @@ static int omap_fbdev_create(struct drm_fb_helper *helper,
mode_cmd.width * ((mode_cmd.bpp + 7) / 8),
mode_cmd.width, mode_cmd.bpp);
if (priv->has_dmm) {
fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
if (fbdev->ywrap_enabled) {
/* need to align pitch to page size if using DMM scrolling */
mode_cmd.pitch = ALIGN(mode_cmd.pitch, PAGE_SIZE);
}
@ -218,12 +222,13 @@ static int omap_fbdev_create(struct drm_fb_helper *helper,
/* if we have DMM, then we can use it for scrolling by just
* shuffling pages around in DMM rather than doing sw blit.
*/
if (priv->has_dmm) {
if (fbdev->ywrap_enabled) {
DRM_INFO("Enabling DMM ywrap scrolling\n");
fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
fbi->fix.ywrapstep = 1;
}
DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);