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atmel_lcdfb: add board parameter specify framebuffer memory size

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Specify how much physically continuous, DMA capable memory will be
allocated at driver initialization time.  This allow to create framebuffer
device with larger virtual resolution.  Combine with y-panning this can be
used to implement double buffering acceleration method.

Signed-off-by: Stanislaw Gruszka <[email protected]>
Acked-by: Haavard Skinnemoen <[email protected]>
Acked-by: Krzysztof Helt <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Haavard Skinnemoen 2008-08-12 15:08:57 -07:00 • committed by Linus Torvalds
commit ea757acad5
2 changed files with 6 additions and 2 deletions
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7
drivers/video/atmel_lcdfb.c
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@ -242,9 +242,11 @@ static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
{
struct fb_info *info = sinfo->info;
struct fb_var_screeninfo *var = &info->var;
unsigned int smem_len;
info->fix.smem_len = (var->xres_virtual * var->yres_virtual
* ((var->bits_per_pixel + 7) / 8));
smem_len = (var->xres_virtual * var->yres_virtual
* ((var->bits_per_pixel + 7) / 8));
info->fix.smem_len = max(smem_len, sinfo->smem_len);
info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,
(dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);
@ -796,6 +798,7 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
sinfo->default_monspecs = pdata_sinfo->default_monspecs;
sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;
sinfo->guard_time = pdata_sinfo->guard_time;
sinfo->smem_len = pdata_sinfo->smem_len;
sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight;
sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode;
} else {