From 1b223c9ebf11e9597820fac57b211709f8ffce26 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Tue, 29 Nov 2011 22:27:34 +0000 Subject: [PATCH] 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 Signed-off-by: Dave Airlie --- drivers/gpu/drm/gma500/framebuffer.c | 46 ++++++++++++++++++---------- 1 file changed, 30 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c index 652f1ecb0a69..9ec167600d04 100644 --- a/drivers/gpu/drm/gma500/framebuffer.c +++ b/drivers/gpu/drm/gma500/framebuffer.c @@ -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);