atmel_lcdfb: add board parameter specify framebuffer memory size

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 <stf_xl@wp.pl>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 16e47eb2ff5dd51a69c0d755f005121f2f3e999b..9c5925927ece04d4f39961ddaa0e596288c5a780 100644 (file)
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -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 {

diff --git a/include/video/atmel_lcdc.h b/include/video/atmel_lcdc.h
index 613173b5db6991040484908e1c0940c00f247d04..920c4e9cb93dce0fb9929603121b4079ffc8ffeb 100644 (file)
--- a/include/video/atmel_lcdc.h
+++ b/include/video/atmel_lcdc.h
@@ -41,6 +41,7 @@ struct atmel_lcdfb_info {
        struct work_struct      task;
 
        unsigned int            guard_time;
+       unsigned int            smem_len;
        struct platform_device  *pdev;
        struct clk              *bus_clk;
        struct clk              *lcdc_clk;