atmel_lcdfb: avoid division by zero

Avoid division by zero in  atmel_lcdfb_check_var() function.

If pixclock is not specified while passing a var structure in
the check_var() funtion, a division by zero occurs (when
translating pixclock to KHz).

This patch adds a checking of this value and try to choose a
video mode in the modelist.

The mode found in the probe function in added to the modelist.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index d335bb96b03..5b3a15dffb5 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -256,6 +256,20 @@ static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
         return 0;
 }
 
+static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
+                                                     struct fb_info *info)
+{
+        struct fb_videomode varfbmode;
+        const struct fb_videomode *fbmode = NULL;
+
+        fb_var_to_videomode(&varfbmode, var);
+        fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
+        if (fbmode)
+                fb_videomode_to_var(var, fbmode);
+        return fbmode;
+}
+
+
 /**
  *      atmel_lcdfb_check_var - Validates a var passed in.
  *      @var: frame buffer variable screen structure
@@ -289,6 +303,15 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
         clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
 
         dev_dbg(dev, "%s:\n", __func__);
+
+        if (!(var->pixclock && var->bits_per_pixel)) {
+                /* choose a suitable mode if possible */
+                if (!atmel_lcdfb_choose_mode(var, info)) {
+                        dev_err(dev, "needed value not specified\n");
+                        return -EINVAL;
+                }
+        }
+
         dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);
         dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));
         dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);
@@ -299,6 +322,13 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
                 return -EINVAL;
         }
 
+        /* Do not allow to have real resoulution larger than virtual */
+        if (var->xres > var->xres_virtual)
+                var->xres_virtual = var->xres;
+
+        if (var->yres > var->yres_virtual)
+                var->yres_virtual = var->yres;
+
         /* Force same alignment for each line */
         var->xres = (var->xres + 3) & ~3UL;
         var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
@@ -740,6 +770,7 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
         struct fb_info *info;
         struct atmel_lcdfb_info *sinfo;
         struct atmel_lcdfb_info *pdata_sinfo;
+        struct fb_videomode fbmode;
         struct resource *regs = NULL;
         struct resource *map = NULL;
         int ret;
@@ -906,6 +937,10 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev)
                 goto free_cmap;
         }
 
+        /* add selected videomode to modelist */
+        fb_var_to_videomode(&fbmode, &info->var);
+        fb_add_videomode(&fbmode, &info->modelist);
+
         /* Power up the LCDC screen */
         if (sinfo->atmel_lcdfb_power_control)
                 sinfo->atmel_lcdfb_power_control(1);