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[ARM] pxafb: cleanup of the color format manipulation code

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1. introduce var_to_depth() to calculate the color depth including the
   transparency bit

2. the conversion from 'fb_var_screeninfo' to LCCR3 BPP bits can be re-
   used by overlays (in OVLxC1), thus an individual pxafb_var_to_bpp()
   has been separated out.

3. pxafb_setmode() should really set the color bitfields correctly at
   begining, introduce a pxafb_set_pixfmt() for this

4. allow user apps to specify color formats within fb_var_screeninfo,
   and checking of this in pxafb_check_var() has been simplified as
   below:

   a) pxafb_var_to_bpp() should pass - which means a basically correct
      bits_per_pixel and color depth setting
   b) the RGBT bitfields are then forced into supported values by
      pxafb_set_pixfmt()

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Eric Miao <ycmiao@ycmiao-hp520.(none)>
This commit is contained in:
Eric Miao
2008-12-18 22:36:26 +08:00
committed by Eric Miao
parent a0427509a7
commit 878f578319
2 changed files with 107 additions and 91 deletions
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15
arch/arm/mach-pxa/include/mach/regs-lcd.h
View File

@@ -28,17 +28,7 @@
#define CMDCR (0x100) /* Command Control Register */
#define PRSR (0x104) /* Panel Read Status Register */
#define LCCR3_1BPP (0 << 24)
#define LCCR3_2BPP (1 << 24)
#define LCCR3_4BPP (2 << 24)
#define LCCR3_8BPP (3 << 24)
#define LCCR3_16BPP (4 << 24)
#define LCCR3_18BPP (5 << 24)
#define LCCR3_18BPP_P (6 << 24)
#define LCCR3_19BPP (7 << 24)
#define LCCR3_19BPP_P (1 << 29)
#define LCCR3_24BPP ((1 << 29) | (1 << 24))
#define LCCR3_25BPP ((1 << 29) | (2 << 24))
#define LCCR3_BPP(x) ((((x) & 0x7) << 24) | (((x) & 0x8) ? (1 << 29) : 0))
#define LCCR3_PDFOR_0 (0 << 30)
#define LCCR3_PDFOR_1 (1 << 30)
@@ -133,9 +123,6 @@
#define LCCR3_PCD Fld (8, 0) /* Pixel Clock Divisor */
#define LCCR3_PixClkDiv(Div) (((Div) << FShft (LCCR3_PCD)))
#define LCCR3_BPP Fld (3, 24) /* Bit Per Pixel */
#define LCCR3_Bpp(Bpp) (((Bpp) << FShft (LCCR3_BPP)))
#define LCCR3_ACB Fld (8, 8) /* AC Bias */
#define LCCR3_Acb(Acb) (((Acb) << FShft (LCCR3_ACB)))