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Date: Tue, 8 Apr 2008 12:05:16 +0800
From: "eric miao" <eric.y.miao@...il.com>
To: "linux-arm-kernel email list"
<linux-arm-kernel@...ts.arm.linux.org.uk>,
linux-fbdev-devel@...ts.sourceforge.net,
lkml <linux-kernel@...r.kernel.org>
Cc: "Russell King - ARM Linux" <linux@....linux.org.uk>,
"Andrew Morton" <akpm@...ux-foundation.org>,
"Daniel Mack" <daniel@...aq.de>
Subject: [PATCH 3/4] pxafb: move parallel LCD timing setup into dedicate function
>From 725710ec6cb3d846e83229f88e6a32099f9b1639 Mon Sep 17 00:00:00 2001
From: Eric Miao <eric.miao@...vell.com>
Date: Thu, 27 Mar 2008 12:01:22 +0800
Subject: [PATCH] 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@...vell.com>
---
drivers/video/pxafb.c | 89 ++++++++++++++++++++++++++-----------------------
drivers/video/pxafb.h | 8 ----
2 files changed, 47 insertions(+), 50 deletions(-)
diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index fb24ca3..c541a66 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -585,6 +585,43 @@ 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.
@@ -593,9 +630,7 @@ 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
@@ -636,61 +671,31 @@ 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);
/*
diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
index f47f139..c627b83 100644
--- a/drivers/video/pxafb.h
+++ b/drivers/video/pxafb.h
@@ -21,14 +21,6 @@
* for more details.
*/
-/* Shadows for LCD controller registers */
-struct pxafb_lcd_reg {
- unsigned int lccr0;
- unsigned int lccr1;
- unsigned int lccr2;
- unsigned int lccr3;
-};
-
/* PXA LCD DMA descriptor */
struct pxafb_dma_descriptor {
unsigned int fdadr;
--
1.5.4.3
--
Cheers
- eric
--
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