pxafb: move parallel LCD timing setup into dedicate function

the new_regs stuff has been removed, and all the setup (modification to those
fbi->reg_*) is protected with IRQ disabled

   * disable IRQ is too heavy here, provided that no IRQ context will
     touch the fbi->reg_* and the only possible contending place is
     in the CPUFREQ_POSTCHANGE (task context), a mutex will be better,
     leave this for future improvement

Signed-off-by: eric miao <eric.miao@marvell.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 47 insertions, 42 deletions

diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index a4ee7225fe2c..d11ea78a06d5 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -594,6 +594,43 @@ static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal,
         return 0;
 }
 
+static void setup_parallel_timing(struct pxafb_info *fbi,
+                                  struct fb_var_screeninfo *var)
+{
+        unsigned int lines_per_panel, pcd = get_pcd(fbi, var->pixclock);
+
+        fbi->reg_lccr1 =
+                LCCR1_DisWdth(var->xres) +
+                LCCR1_HorSnchWdth(var->hsync_len) +
+                LCCR1_BegLnDel(var->left_margin) +
+                LCCR1_EndLnDel(var->right_margin);
+
+        /*
+         * If we have a dual scan LCD, we need to halve
+         * the YRES parameter.
+         */
+        lines_per_panel = var->yres;
+        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
+                lines_per_panel /= 2;
+
+        fbi->reg_lccr2 =
+                LCCR2_DisHght(lines_per_panel) +
+                LCCR2_VrtSnchWdth(var->vsync_len) +
+                LCCR2_BegFrmDel(var->upper_margin) +
+                LCCR2_EndFrmDel(var->lower_margin);
+
+        fbi->reg_lccr3 = fbi->lccr3 |
+                (var->sync & FB_SYNC_HOR_HIGH_ACT ?
+                 LCCR3_HorSnchH : LCCR3_HorSnchL) |
+                (var->sync & FB_SYNC_VERT_HIGH_ACT ?
+                 LCCR3_VrtSnchH : LCCR3_VrtSnchL);
+
+        if (pcd) {
+                fbi->reg_lccr3 |= LCCR3_PixClkDiv(pcd);
+                set_hsync_time(fbi, pcd);
+        }
+}
+
 /*
  * pxafb_activate_var():
  *      Configures LCD Controller based on entries in var parameter.
@@ -602,9 +639,7 @@ static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal,
 static int pxafb_activate_var(struct fb_var_screeninfo *var,
                               struct pxafb_info *fbi)
 {
-        struct pxafb_lcd_reg new_regs;
         u_long flags;
-        u_int lines_per_panel, pcd = get_pcd(fbi, var->pixclock);
         size_t nbytes;
 
 #if DEBUG_VAR
@@ -645,61 +680,31 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
                         fbi->fb.fix.id, var->lower_margin);
 #endif
+        /* Update shadow copy atomically */
+        local_irq_save(flags);
+
+        setup_parallel_timing(fbi, var);
 
-        new_regs.lccr0 = fbi->lccr0 |
+        fbi->reg_lccr0 = fbi->lccr0 |
                 (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
                  LCCR0_QDM | LCCR0_BM  | LCCR0_OUM);
 
-        new_regs.lccr1 =
-                LCCR1_DisWdth(var->xres) +
-                LCCR1_HorSnchWdth(var->hsync_len) +
-                LCCR1_BegLnDel(var->left_margin) +
-                LCCR1_EndLnDel(var->right_margin);
-
-        /*
-         * If we have a dual scan LCD, we need to halve
-         * the YRES parameter.
-         */
-        lines_per_panel = var->yres;
-        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
-                lines_per_panel /= 2;
-
-        new_regs.lccr2 =
-                LCCR2_DisHght(lines_per_panel) +
-                LCCR2_VrtSnchWdth(var->vsync_len) +
-                LCCR2_BegFrmDel(var->upper_margin) +
-                LCCR2_EndFrmDel(var->lower_margin);
+        fbi->reg_lccr3 |= pxafb_bpp_to_lccr3(var);
 
-        new_regs.lccr3 = fbi->lccr3 |
-                pxafb_bpp_to_lccr3(var) |
-                (var->sync & FB_SYNC_HOR_HIGH_ACT ?
-                 LCCR3_HorSnchH : LCCR3_HorSnchL) |
-                (var->sync & FB_SYNC_VERT_HIGH_ACT ?
-                 LCCR3_VrtSnchH : LCCR3_VrtSnchL);
+        nbytes = var->yres * fbi->fb.fix.line_length;
 
-        if (pcd)
-                new_regs.lccr3 |= LCCR3_PixClkDiv(pcd);
-
-        /* Update shadow copy atomically */
-        local_irq_save(flags);
-
-        nbytes = lines_per_panel * fbi->fb.fix.line_length;
-
-        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
+        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual) {
+                nbytes = nbytes / 2;
                 setup_frame_dma(fbi, DMA_LOWER, PAL_NONE, nbytes, nbytes);
+        }
 
         if (var->bits_per_pixel >= 16)
                 setup_frame_dma(fbi, DMA_BASE, PAL_NONE, 0, nbytes);
         else
                 setup_frame_dma(fbi, DMA_BASE, PAL_BASE, 0, nbytes);
 
-        fbi->reg_lccr0 = new_regs.lccr0;
-        fbi->reg_lccr1 = new_regs.lccr1;
-        fbi->reg_lccr2 = new_regs.lccr2;
-        fbi->reg_lccr3 = new_regs.lccr3;
         fbi->reg_lccr4 = lcd_readl(fbi, LCCR4) & ~LCCR4_PAL_FOR_MASK;
         fbi->reg_lccr4 |= (fbi->lccr4 & LCCR4_PAL_FOR_MASK);
-        set_hsync_time(fbi, pcd);
         local_irq_restore(flags);
 
         /*