[ARM] 3848/1: pxafb: Add option of fixing video modes and spitz QVGA mode support

Add the ability to have pxafb use only certain fixed video modes
(selected on a per platform basis). This is useful on production
hardware such as the Zaurus cxx00 models where the valid modes are
known in advance and any other modes could result in hardware damage.

Following this, add support for the cxx00 QVGA mode. Mode information
is passed to the lcd_power call to allowing the panel drivers to
configure the display hardware accordingly (corgi_lcd already contains
the functionality for the cxx00 panel).

This mirrors the setup already used by w100fb.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 78 insertions, 28 deletions

diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index bbb07106cd54..3bc5da4a57ca 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -59,7 +59,7 @@
 #define LCCR3_INVALID_CONFIG_MASK (LCCR3_HSP|LCCR3_VSP|LCCR3_PCD|LCCR3_BPP)
 
 static void (*pxafb_backlight_power)(int);
-static void (*pxafb_lcd_power)(int);
+static void (*pxafb_lcd_power)(int, struct fb_var_screeninfo *);
 
 static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *);
 static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);
@@ -214,6 +214,48 @@ extern unsigned int get_clk_frequency_khz(int info);
 #endif
 
 /*
+ * Select the smallest mode that allows the desired resolution to be
+ * displayed. If desired parameters can be rounded up.
+ */
+static struct pxafb_mode_info *pxafb_getmode(struct pxafb_mach_info *mach, struct fb_var_screeninfo *var)
+{
+        struct pxafb_mode_info *mode = NULL;
+        struct pxafb_mode_info *modelist = mach->modes;
+        unsigned int best_x = 0xffffffff, best_y = 0xffffffff;
+        unsigned int i;
+
+        for (i = 0 ; i < mach->num_modes ; i++) {
+                if (modelist[i].xres >= var->xres && modelist[i].yres >= var->yres &&
+                                modelist[i].xres < best_x && modelist[i].yres < best_y &&
+                                modelist[i].bpp >= var->bits_per_pixel ) {
+                        best_x = modelist[i].xres;
+                        best_y = modelist[i].yres;
+                        mode = &modelist[i];
+                }
+        }
+
+        return mode;
+}
+
+static void pxafb_setmode(struct fb_var_screeninfo *var, struct pxafb_mode_info *mode)
+{
+        var->xres               = mode->xres;
+        var->yres               = mode->yres;
+        var->bits_per_pixel     = mode->bpp;
+        var->pixclock           = mode->pixclock;
+        var->hsync_len          = mode->hsync_len;
+        var->left_margin        = mode->left_margin;
+        var->right_margin       = mode->right_margin;
+        var->vsync_len          = mode->vsync_len;
+        var->upper_margin       = mode->upper_margin;
+        var->lower_margin       = mode->lower_margin;
+        var->sync               = mode->sync;
+        var->grayscale          = mode->cmap_greyscale;
+        var->xres_virtual       = var->xres;
+        var->yres_virtual       = var->yres;
+}
+
+/*
  *  pxafb_check_var():
  *    Get the video params out of 'var'. If a value doesn't fit, round it up,
  *    if it's too big, return -EINVAL.
@@ -225,15 +267,29 @@ extern unsigned int get_clk_frequency_khz(int info);
 static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 {
         struct pxafb_info *fbi = (struct pxafb_info *)info;
+        struct pxafb_mach_info *inf = fbi->dev->platform_data;
 
         if (var->xres < MIN_XRES)
                 var->xres = MIN_XRES;
         if (var->yres < MIN_YRES)
                 var->yres = MIN_YRES;
-        if (var->xres > fbi->max_xres)
-                return -EINVAL;
-        if (var->yres > fbi->max_yres)
-                return -EINVAL;
+
+        if (inf->fixed_modes) {
+                struct pxafb_mode_info *mode;
+
+                mode = pxafb_getmode(inf, var);
+                if (!mode)
+                        return -EINVAL;
+                pxafb_setmode(var, mode);
+        } else {
+                if (var->xres > inf->modes->xres)
+                        return -EINVAL;
+                if (var->yres > inf->modes->yres)
+                        return -EINVAL;
+                if (var->bits_per_pixel > inf->modes->bpp)
+                        return -EINVAL;
+        }
+
         var->xres_virtual =
                 max(var->xres_virtual, var->xres);
         var->yres_virtual =
@@ -693,7 +749,7 @@ static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
         pr_debug("pxafb: LCD power o%s\n", on ? "n" : "ff");
 
         if (pxafb_lcd_power)
-                pxafb_lcd_power(on);
+                pxafb_lcd_power(on, &fbi->fb.var);
 }
 
 static void pxafb_setup_gpio(struct pxafb_info *fbi)
@@ -869,9 +925,11 @@ static void set_ctrlr_state(struct pxafb_info *fbi, u_int state)
                  * registers.
                  */
                 if (old_state == C_ENABLE) {
+                        __pxafb_lcd_power(fbi, 0);
                         pxafb_disable_controller(fbi);
                         pxafb_setup_gpio(fbi);
                         pxafb_enable_controller(fbi);
+                        __pxafb_lcd_power(fbi, 1);
                 }
                 break;
 
@@ -1049,6 +1107,8 @@ static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
         struct pxafb_info *fbi;
         void *addr;
         struct pxafb_mach_info *inf = dev->platform_data;
+        struct pxafb_mode_info *mode = inf->modes;
+        int i, smemlen;
 
         /* Alloc the pxafb_info and pseudo_palette in one step */
         fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
@@ -1082,31 +1142,21 @@ static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
         addr = addr + sizeof(struct pxafb_info);
         fbi->fb.pseudo_palette  = addr;
 
-        fbi->max_xres                   = inf->xres;
-        fbi->fb.var.xres                = inf->xres;
-        fbi->fb.var.xres_virtual        = inf->xres;
-        fbi->max_yres                   = inf->yres;
-        fbi->fb.var.yres                = inf->yres;
-        fbi->fb.var.yres_virtual        = inf->yres;
-        fbi->max_bpp                    = inf->bpp;
-        fbi->fb.var.bits_per_pixel      = inf->bpp;
-        fbi->fb.var.pixclock            = inf->pixclock;
-        fbi->fb.var.hsync_len           = inf->hsync_len;
-        fbi->fb.var.left_margin         = inf->left_margin;
-        fbi->fb.var.right_margin        = inf->right_margin;
-        fbi->fb.var.vsync_len           = inf->vsync_len;
-        fbi->fb.var.upper_margin        = inf->upper_margin;
-        fbi->fb.var.lower_margin        = inf->lower_margin;
-        fbi->fb.var.sync                = inf->sync;
-        fbi->fb.var.grayscale           = inf->cmap_greyscale;
+        pxafb_setmode(&fbi->fb.var, mode);
+
         fbi->cmap_inverse               = inf->cmap_inverse;
         fbi->cmap_static                = inf->cmap_static;
+
         fbi->lccr0                      = inf->lccr0;
         fbi->lccr3                      = inf->lccr3;
         fbi->state                      = C_STARTUP;
         fbi->task_state                 = (u_char)-1;
-        fbi->fb.fix.smem_len            = fbi->max_xres * fbi->max_yres *
-                                          fbi->max_bpp / 8;
+
+        for (i = 0; i < inf->num_modes; i++) {
+                smemlen = mode[i].xres * mode[i].yres * mode[i].bpp / 8;
+                if (smemlen > fbi->fb.fix.smem_len)
+                        fbi->fb.fix.smem_len = smemlen;
+        }
 
         init_waitqueue_head(&fbi->ctrlr_wait);
         INIT_WORK(&fbi->task, pxafb_task, fbi);
@@ -1307,12 +1357,12 @@ int __init pxafb_probe(struct platform_device *dev)
             (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
                 dev_warn(&dev->dev, "Dual panel only valid in passive mode\n");
         if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
-             (inf->upper_margin || inf->lower_margin))
+             (inf->modes->upper_margin || inf->modes->lower_margin))
                 dev_warn(&dev->dev, "Upper and lower margins must be 0 in passive mode\n");
 #endif
 
-        dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n",inf->xres, inf->yres, inf->bpp);
-        if (inf->xres == 0 || inf->yres == 0 || inf->bpp == 0) {
+        dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n",inf->modes->xres, inf->modes->yres, inf->modes->bpp);
+        if (inf->modes->xres == 0 || inf->modes->yres == 0 || inf->modes->bpp == 0) {
                 dev_err(&dev->dev, "Invalid resolution or bit depth\n");
                 ret = -EINVAL;
                 goto failed;