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ARM: clcd: add method for describing display capabilities

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The ARM CLCD PL110 controller in TFT mode provides two output formats
based on whether the controller is in 24bpp mode or not - either 5551
or 888.  PL111 augments this with a 444 and 565 modes.

Some implementations provide an external MUX on the PL110 output to
reassign the bits to achieve 565 mode.

Provide a system of capability flags to allow the CLCD driver to work
out what is supported by each panel and board, and therefore which
display formats are permitted.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-01-21 14:03:28 +00:00
parent 9c49e4ab84
commit 7b4e9ced69
2 changed files with 153 additions and 32 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

103
drivers/video/amba-clcd.c
View file

@ -120,8 +120,23 @@ static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
static int
clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
{
u32 caps;
int ret = 0;
if (fb->panel->caps && fb->board->caps)
caps = fb->panel->caps & fb->board->caps;
else {
/* Old way of specifying what can be used */
caps = fb->panel->cntl & CNTL_BGR ?
CLCD_CAP_BGR : CLCD_CAP_RGB;
/* But mask out 444 modes as they weren't supported */
caps &= ~CLCD_CAP_444;
}
/* Only TFT panels can do RGB888/BGR888 */
if (!(fb->panel->cntl & CNTL_LCDTFT))
caps &= ~CLCD_CAP_888;
memset(&var->transp, 0, sizeof(var->transp));
var->red.msb_right = 0;
@ -133,6 +148,13 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
case 2:
case 4:
case 8:
/* If we can't do 5551, reject */
caps &= CLCD_CAP_5551;
if (!caps) {
ret = -EINVAL;
break;
}
var->red.length = var->bits_per_pixel;
var->red.offset = 0;
var->green.length = var->bits_per_pixel;
@ -140,23 +162,61 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
var->blue.length = var->bits_per_pixel;
var->blue.offset = 0;
break;
case 16:
var->red.length = 5;
var->blue.length = 5;
/*
* Green length can be 5 or 6 depending whether
* we're operating in RGB555 or RGB565 mode.
*/
if (var->green.length != 5 && var->green.length != 6)
var->green.length = 6;
break;
case 32:
if (fb->panel->cntl & CNTL_LCDTFT) {
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
/* If we can't do 444, 5551 or 565, reject */
if (!(caps & (CLCD_CAP_444 | CLCD_CAP_5551 | CLCD_CAP_565))) {
ret = -EINVAL;
break;
}
/*
* Green length can be 4, 5 or 6 depending whether
* we're operating in 444, 5551 or 565 mode.
*/
if (var->green.length == 4 && caps & CLCD_CAP_444)
caps &= CLCD_CAP_444;
if (var->green.length == 5 && caps & CLCD_CAP_5551)
caps &= CLCD_CAP_5551;
else if (var->green.length == 6 && caps & CLCD_CAP_565)
caps &= CLCD_CAP_565;
else {
/*
* PL110 officially only supports RGB555,
* but may be wired up to allow RGB565.
*/
if (caps & CLCD_CAP_565) {
var->green.length = 6;
caps &= CLCD_CAP_565;
} else if (caps & CLCD_CAP_5551) {
var->green.length = 5;
caps &= CLCD_CAP_5551;
} else {
var->green.length = 4;
caps &= CLCD_CAP_444;
}
}
if (var->green.length >= 5) {
var->red.length = 5;
var->blue.length = 5;
} else {
var->red.length = 4;
var->blue.length = 4;
}
break;
case 32:
/* If we can't do 888, reject */
caps &= CLCD_CAP_888;
if (!caps) {
ret = -EINVAL;
break;
}
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
break;
default:
ret = -EINVAL;
break;
@ -168,7 +228,20 @@ clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
* the bitfield length defined above.
*/
if (ret == 0 && var->bits_per_pixel >= 16) {
if (fb->panel->cntl & CNTL_BGR) {
bool bgr, rgb;
bgr = caps & CLCD_CAP_BGR && var->blue.offset == 0;
rgb = caps & CLCD_CAP_RGB && var->red.offset == 0;
if (!bgr && !rgb)
/*
* The requested format was not possible, try just
* our capabilities. One of BGR or RGB must be
* supported.
*/
bgr = caps & CLCD_CAP_BGR;
if (bgr) {
var->blue.offset = 0;
var->green.offset = var->blue.offset + var->blue.length;
var->red.offset = var->green.offset + var->green.length;

82
include/linux/amba/clcd.h
View file

@ -53,6 +53,7 @@
#define CNTL_LCDBPP8 (3 << 1)
#define CNTL_LCDBPP16 (4 << 1)
#define CNTL_LCDBPP16_565 (6 << 1)
#define CNTL_LCDBPP16_444 (7 << 1)
#define CNTL_LCDBPP24 (5 << 1)
#define CNTL_LCDBW (1 << 4)
#define CNTL_LCDTFT (1 << 5)
@ -66,6 +67,32 @@
#define CNTL_LDMAFIFOTIME (1 << 15)
#define CNTL_WATERMARK (1 << 16)
enum {
/* individual formats */
CLCD_CAP_RGB444 = (1 << 0),
CLCD_CAP_RGB5551 = (1 << 1),
CLCD_CAP_RGB565 = (1 << 2),
CLCD_CAP_RGB888 = (1 << 3),
CLCD_CAP_BGR444 = (1 << 4),
CLCD_CAP_BGR5551 = (1 << 5),
CLCD_CAP_BGR565 = (1 << 6),
CLCD_CAP_BGR888 = (1 << 7),
/* connection layouts */
CLCD_CAP_444 = CLCD_CAP_RGB444 | CLCD_CAP_BGR444,
CLCD_CAP_5551 = CLCD_CAP_RGB5551 | CLCD_CAP_BGR5551,
CLCD_CAP_565 = CLCD_CAP_RGB565 | CLCD_CAP_BGR565,
CLCD_CAP_888 = CLCD_CAP_RGB888 | CLCD_CAP_BGR888,
/* red/blue ordering */
CLCD_CAP_RGB = CLCD_CAP_RGB444 | CLCD_CAP_RGB5551 |
CLCD_CAP_RGB565 | CLCD_CAP_RGB888,
CLCD_CAP_BGR = CLCD_CAP_BGR444 | CLCD_CAP_BGR5551 |
CLCD_CAP_BGR565 | CLCD_CAP_BGR888,
CLCD_CAP_ALL = CLCD_CAP_BGR | CLCD_CAP_RGB,
};
struct clcd_panel {
struct fb_videomode mode;
signed short width; /* width in mm */
@ -73,6 +100,7 @@ struct clcd_panel {
u32 tim2;
u32 tim3;
u32 cntl;
u32 caps;
unsigned int bpp:8,
fixedtimings:1,
grayscale:1;
@ -96,6 +124,11 @@ struct clcd_fb;
struct clcd_board {
const char *name;
/*
* Optional. Hardware capability flags.
*/
u32 caps;
/*
* Optional. Check whether the var structure is acceptable
* for this display.
@ -155,34 +188,35 @@ struct clcd_fb {
static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
{
struct fb_var_screeninfo *var = &fb->fb.var;
u32 val, cpl;
/*
* Program the CLCD controller registers and start the CLCD
*/
val = ((fb->fb.var.xres / 16) - 1) << 2;
val |= (fb->fb.var.hsync_len - 1) << 8;
val |= (fb->fb.var.right_margin - 1) << 16;
val |= (fb->fb.var.left_margin - 1) << 24;
val = ((var->xres / 16) - 1) << 2;
val |= (var->hsync_len - 1) << 8;
val |= (var->right_margin - 1) << 16;
val |= (var->left_margin - 1) << 24;
regs->tim0 = val;
val = fb->fb.var.yres;
val = var->yres;
if (fb->panel->cntl & CNTL_LCDDUAL)
val /= 2;
val -= 1;
val |= (fb->fb.var.vsync_len - 1) << 10;
val |= fb->fb.var.lower_margin << 16;
val |= fb->fb.var.upper_margin << 24;
val |= (var->vsync_len - 1) << 10;
val |= var->lower_margin << 16;
val |= var->upper_margin << 24;
regs->tim1 = val;
val = fb->panel->tim2;
val |= fb->fb.var.sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS;
val |= fb->fb.var.sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
val |= var->sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS;
val |= var->sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS;
cpl = fb->fb.var.xres_virtual;
cpl = var->xres_virtual;
if (fb->panel->cntl & CNTL_LCDTFT) /* TFT */
/* / 1 */;
else if (!fb->fb.var.grayscale) /* STN color */
else if (!var->grayscale) /* STN color */
cpl = cpl * 8 / 3;
else if (fb->panel->cntl & CNTL_LCDMONO8) /* STN monochrome, 8bit */
cpl /= 8;
@ -194,10 +228,22 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
regs->tim3 = fb->panel->tim3;
val = fb->panel->cntl;
if (fb->fb.var.grayscale)
if (var->grayscale)
val |= CNTL_LCDBW;
switch (fb->fb.var.bits_per_pixel) {
if (fb->panel->caps && fb->board->caps &&
var->bits_per_pixel >= 16) {
/*
* if board and panel supply capabilities, we can support
* changing BGR/RGB depending on supplied parameters
*/
if (var->red.offset == 0)
val &= ~CNTL_BGR;
else
val |= CNTL_BGR;
}
switch (var->bits_per_pixel) {
case 1:
val |= CNTL_LCDBPP1;
break;
@ -217,10 +263,12 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
* custom external wiring.
*/
if (amba_part(fb->dev) == 0x110 ||
fb->fb.var.green.length == 5)
var->green.length == 5)
val |= CNTL_LCDBPP16;
else
else if (var->green.length == 6)
val |= CNTL_LCDBPP16_565;
else
val |= CNTL_LCDBPP16_444;
break;
case 32:
val |= CNTL_LCDBPP24;
@ -228,7 +276,7 @@ static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs)
}
regs->cntl = val;
regs->pixclock = fb->fb.var.pixclock;
regs->pixclock = var->pixclock;
}
static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var)