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gma500: Be smarter about layout 

If we can't fit a page aligned display stride then it's not the end of the
world for a normal font, so try half a page and work down sizes.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alan Cox 2011-11-29 22:27:34 +00:00 committed by Dave Airlie
parent a6ba582d26
commit 1b223c9ebf
1 changed files with 30 additions and 16 deletions
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46
drivers/gpu/drm/gma500/framebuffer.c
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@ -385,7 +385,8 @@ static int psbfb_create(struct psb_fbdev *fbdev,
int ret;
struct gtt_range *backing;
u32 bpp, depth;
int gtt_roll = 1;
int gtt_roll = 0;
int pitch_lines = 0;
mode_cmd.width = sizes->surface_width;
mode_cmd.height = sizes->surface_height;
@ -395,27 +396,40 @@ static int psbfb_create(struct psb_fbdev *fbdev,
if (bpp == 24)
bpp = 32;
/* Acceleration via the GTT requires pitch to be 4096 byte aligned
(ie 1024 or 2048 pixels in normal use) */
mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((bpp + 7) / 8), 4096);
depth = sizes->surface_depth;
do {
/*
* Acceleration via the GTT requires pitch to be
* power of two aligned. Preferably page but less
* is ok with some fonts
*/
mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((bpp + 7) / 8), 4096 >> pitch_lines);
depth = sizes->surface_depth;
size = mode_cmd.pitches[0] * mode_cmd.height;
size = ALIGN(size, PAGE_SIZE);
size = mode_cmd.pitches[0] * mode_cmd.height;
size = ALIGN(size, PAGE_SIZE);
/* Allocate the fb in the GTT with stolen page backing */
backing = psbfb_alloc(dev, size);
if (pitch_lines)
pitch_lines *= 2;
else
pitch_lines = 1;
gtt_roll++;
} while (backing == NULL && pitch_lines <= 16);
/* The final pitch we accepted if we succeeded */
pitch_lines /= 2;
/* Try and allocate with the alignment we need */
backing = psbfb_alloc(dev, size);
if (backing == NULL) {
/*
* We couldn't get the space we wanted, fall back to the
* display engine requirement instead. The HW requires
* the pitch to be 64 byte aligned
*
* FIXME: We could try alignments in a loop so that we can still
* accelerate power of two font sizes.
*/
gtt_roll = 0; /* Don't use GTT accelerated scrolling */
pitch_lines = 64;
mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((bpp + 7) / 8), 64);
@ -452,12 +466,12 @@ static int psbfb_create(struct psb_fbdev *fbdev,
strcpy(info->fix.id, "psbfb");
info->flags = FBINFO_DEFAULT;
if (gtt_roll) { /* GTT rolling seems best */
if (dev_priv->ops->accel_2d && pitch_lines > 8) /* 2D engine */
info->fbops = &psbfb_ops;
else if (gtt_roll) { /* GTT rolling seems best */
info->fbops = &psbfb_roll_ops;
info->flags |= FBINFO_HWACCEL_YPAN;
} else if (dev_priv->ops->accel_2d) /* 2D engine */
info->fbops = &psbfb_ops;
else /* Software */
} else /* Software */
info->fbops = &psbfb_unaccel_ops;
ret = fb_alloc_cmap(&info->cmap, 256, 0);