linux-kernel - Re: [RFC PATCHv3 1/6] arm: Initial TI-Nspire support

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Date:	Sun, 12 May 2013 10:06:10 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Daniel Tang <dt.tangr@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	"fabian@...ter-vogt.de Vogt" <fabian@...ter-vogt.de>,
	Lionel Debroux <lionel_debroux@...oo.fr>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCHv3 1/6] arm: Initial TI-Nspire support

On Sun, May 12, 2013 at 02:22:56PM +1000, Daniel Tang wrote:
> diff --git a/arch/arm/mach-nspire/clcd.c b/arch/arm/mach-nspire/clcd.c
> new file mode 100644
> index 0000000..a4b9f06
> --- /dev/null
> +++ b/arch/arm/mach-nspire/clcd.c
> @@ -0,0 +1,117 @@
> +/*
> + *	linux/arch/arm/mach-nspire/clcd.c
> + *
> + *	Copyright (C) 2013 Daniel Tang <tangrs@...grs.id.au>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2, as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/init.h>
> +#include <linux/of.h>
> +#include <linux/amba/bus.h>
> +#include <linux/amba/clcd.h>
> +#include <linux/dma-mapping.h>
> +
> +static struct clcd_panel nspire_cx_lcd_panel = {
> +	.mode		= {
> +		.name		= "Color LCD",
> +		.refresh	= 60,
> +		.xres		= 320,
> +		.yres		= 240,
> +		.sync		= 0,
> +		.vmode		= FB_VMODE_NONINTERLACED,
> +		.pixclock	= 1,
> +		.hsync_len	= 6,
> +		.vsync_len	= 1,
> +		.right_margin	= 50,
> +		.left_margin	= 38,
> +		.lower_margin	= 3,
> +		.upper_margin	= 17,
> +	},
> +	.width		= 65, /* ~6.50 cm */
> +	.height		= 49, /* ~4.87 cm */
> +	.tim2		= TIM2_IPC,
> +	.cntl		= CNTL_LCDTFT | CNTL_LCDVCOMP(1),
> +	.bpp		= 16,
> +};
> +
> +static struct clcd_panel nspire_classic_lcd_panel = {
> +	.mode		= {
> +		.name		= "Grayscale LCD",
> +		.refresh	= 60,
> +		.xres		= 320,
> +		.yres		= 240,
> +		.sync		= FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
> +		.vmode		= FB_VMODE_NONINTERLACED,
> +		.pixclock	= 1,
> +		.hsync_len	= 6,
> +		.vsync_len	= 1,
> +		.right_margin	= 6,
> +		.left_margin	= 6,
> +	},
> +	.width		= 71, /* 7.11cm */
> +	.height		= 53, /* 5.33cm */
> +	.tim2		= 0x80007d0,
> +	.cntl		= CNTL_LCDMONO8,
> +	.bpp		= 8,
> +	.grayscale	= 1
> +};

Still no capabilities in the above - how does the CLCD controller know
which of BGR or RGB output and which format these panels support?

Each entry needs a .caps = CLCD_CAP_xxx | CLCD_CAP_xxx listing the
formats supported there.

Unless panels and the board have a .caps entry, the caps system won't
be used.

> +static struct clcd_board nspire_clcd_data = {
> +       .name           = "LCD",
> +       .caps           = CLCD_CAP_ALL,

Your board has logic to support the RGB444/BGR444 mode?  If not, setting
CLCD_CAP_ALL is incorrect.
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