From mboxrd@z Thu Jan  1 00:00:00 1970
From: mcuelenaere@gmail.com (Maurus Cuelenaere)
Date: Thu, 15 Jul 2010 12:32:26 +0200
Subject: [PATCH 05/10 v2] s3c-fb: Add v4l2 subdevice to support framebuffer
	local fifo input path
In-Reply-To: <1279185041-6004-6-git-send-email-s.nawrocki@samsung.com>
References: <1279185041-6004-1-git-send-email-s.nawrocki@samsung.com>
	<1279185041-6004-6-git-send-email-s.nawrocki@samsung.com>
Message-ID: <4C3EE3BA.9020307@gmail.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

 Op 15-07-10 11:10, Sylwester Nawrocki schreef:
> Selected multimedia devices in Samsung S3C/S5P SoC series are capable of
> transferring data directly between each other, bypassing the main system
> bus. Such a datapath exists between the camera interface/video
> postprocessor and the lcd controller. To control the data flow from the
> fimc driver level v4l2-subdevice driver is added to the framebuffer.
> It enables to configure the lcd controller into FIFO or DMA input mode.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  arch/arm/plat-samsung/include/plat/fb.h |    6 +
>  drivers/video/s3c-fb.c                  |  487 +++++++++++++++++++++++++++++--
>  2 files changed, 472 insertions(+), 21 deletions(-)

<snip>

>  /**
> + * s3c_fb_enable_local() - switch window between input DMA and fifo modes
> + *
> + * @fb_sd: window subdevice for fifo input
> + * @en:    1 - switch from input DMA to fifo mode and apply
> + *	       window size and position set by the window's subdevice
> + *         0 - restore from fifo to DMA mode
> + */
> +static int s3c_fb_enable_local_in(struct s3c_fb_win_sd *fb_sd, int en)
> +{
> +	struct s3c_fb_win *win = fb_sd->win;
> +	struct s3c_fb *sfb = win->parent;
> +	static u32 wincon;
> +	u32 reg, data;
> +	int ret = 0, bpp = 32;
> +
> +	/* disable video output and the window logic */
> +	reg = readl(sfb->regs + WINCON(win->index));
> +	writel(reg & ~WINCONx_ENWIN, sfb->regs + WINCON(win->index));
> +
> +	shadow_protect_win(win, 1);
> +
> +	if (en == 1) {
> +		if (fb_sd->streaming)
> +			return 0;

Shouldn't you do shadow_protect_win(win, 0) before returning here?

> +
> +		wincon = reg;
> +
> +		switch (fb_sd->fmt.fmt.pix.pixelformat) {
> +		case V4L2_PIX_FMT_YUYV: /* YCbCr 4:4:4 */
> +			reg |= WINCONx_YCbCr | WINCONx_ENLOCAL;
> +			bpp = 16;
> +			break;
> +
> +		case V4L2_PIX_FMT_RGB24:
> +		default:
> +			reg &= ~(WINCONx_YCbCr | WINCONx_WSWP | WINCONx_HAWSWP |
> +				 WINCONx_BYTSWP | WINCONx_BITSWP |
> +				 WINCON0_BPPMODE_MASK | WINCONx_BURSTLEN_MASK);
> +
> +			reg |=	WINCON0_BPPMODE_24BPP_888 |
> +				WINCONx_BURSTLEN_4WORD;
> +			bpp = 24;
> +			break;
> +		}
> +
> +		fb_sd->streaming = 1;
> +		writel(reg, sfb->regs + WINCON(win->index));
> +
> +		s3c_fb_set_osd(fb_sd->win, &fb_sd->curr_osd_win, bpp);
> +
> +		writel(reg | WINCONx_ENLOCAL, sfb->regs + WINCON(win->index));
> +
> +		shadow_protect_win(win, 0);
> +
> +		reg = readl(sfb->regs + WINCON(win->index));
> +		writel(reg | WINCONx_ENWIN, sfb->regs + WINCON(win->index));
> +
> +		if (sfb->variant.has_shadowcon)	{
> +			data = readl(sfb->regs + SHADOWCON);
> +			data |=	SHADOWCON_CHx_LOCAL_ENABLE(win->index);
> +			writel(data, sfb->regs + SHADOWCON);
> +		}
> +
> +	} else if (en == 0) {
> +		if (!fb_sd->streaming)
> +			return 0;

Same comment

> +
> +		fb_sd->streaming = 0;
> +
> +		/* need to be aligned with VSYNC interrupt */
> +		writel(wincon & ~WINCONx_ENLOCAL,
> +		       sfb->regs + WINCON(win->index));
> +
> +		/* restore OSD values from before we enabled local mode */
> +		bpp = win->fbinfo->var.bits_per_pixel;
> +		s3c_fb_set_osd(fb_sd->win, &fb_sd->default_osd_win, bpp);
> +
> +		shadow_protect_win(win, 0);
> +
> +		if (sfb->variant.has_shadowcon)	{
> +			data = readl(sfb->regs + SHADOWCON);
> +			data &=	~SHADOWCON_CHx_LOCAL_ENABLE(win->index);
> +			writel(data, sfb->regs + SHADOWCON);
> +		}
> +
> +		reg = readl(sfb->regs + WINCON(win->index));
> +		writel(reg | WINCONx_ENWIN, sfb->regs + WINCON(win->index));
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	return ret;
> +}
> +

-- 
Maurus Cuelenaere