From 04ab9ef97771ba88789672a1f0d0ddcf8dbc0924 Mon Sep 17 00:00:00 2001 From: Pawel Osciak Date: Tue, 10 Aug 2010 18:02:43 -0700 Subject: [PATCH] s3c-fb: add support for DMA channel control on S5PV210 S5PV210 SoCs allow enabling/disabling DMA channels per window. For a window to display data from framebuffer memory, its channel has to be enabled. Signed-off-by: Pawel Osciak Signed-off-by: Marek Szyprowski Signed-off-by: Kyungmin Park Cc: InKi Dae Cc: Ben Dooks Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/arm/plat-samsung/include/plat/regs-fb.h | 4 ++++ drivers/video/s3c-fb.c | 15 +++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/arch/arm/plat-samsung/include/plat/regs-fb.h b/arch/arm/plat-samsung/include/plat/regs-fb.h index 4359918b58b0..8f39aa5b26ea 100644 --- a/arch/arm/plat-samsung/include/plat/regs-fb.h +++ b/arch/arm/plat-samsung/include/plat/regs-fb.h @@ -223,6 +223,10 @@ /* S5PV210 */ #define SHADOWCON (0x34) #define SHADOWCON_WINx_PROTECT(_win) (1 << (10 + (_win))) +/* DMA channels (all windows) */ +#define SHADOWCON_CHx_ENABLE(_win) (1 << (_win)) +/* Local input channels (windows 0-2) */ +#define SHADOWCON_CHx_LOCAL_ENABLE(_win) (1 << (5 + (_win))) #define VIDOSDxA_TOPLEFT_X_MASK (0x7ff << 11) #define VIDOSDxA_TOPLEFT_X_SHIFT (11) diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c index a95314ddf709..8ea974dd92c5 100644 --- a/drivers/video/s3c-fb.c +++ b/drivers/video/s3c-fb.c @@ -634,6 +634,13 @@ static int s3c_fb_set_par(struct fb_info *info) writel(data, regs + sfb->variant.wincon + (win_no * 4)); writel(0x0, regs + sfb->variant.winmap + (win_no * 4)); + /* Enable DMA channel for this window */ + if (sfb->variant.has_shadowcon) { + data = readl(sfb->regs + SHADOWCON); + data |= SHADOWCON_CHx_ENABLE(win_no); + writel(data, sfb->regs + SHADOWCON); + } + shadow_protect_win(win, 0); return 0; @@ -1091,7 +1098,15 @@ static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win) */ static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win) { + u32 data; + if (win->fbinfo) { + if (sfb->variant.has_shadowcon) { + data = readl(sfb->regs + SHADOWCON); + data &= ~SHADOWCON_CHx_ENABLE(win->index); + data &= ~SHADOWCON_CHx_LOCAL_ENABLE(win->index); + writel(data, sfb->regs + SHADOWCON); + } unregister_framebuffer(win->fbinfo); if (win->fbinfo->cmap.len) fb_dealloc_cmap(&win->fbinfo->cmap); -- 2.20.1