Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965437AbbLORZf (ORCPT ); Tue, 15 Dec 2015 12:25:35 -0500 Received: from unicorn.mansr.com ([81.2.72.234]:41273 "EHLO unicorn.mansr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965091AbbLORZc (ORCPT ); Tue, 15 Dec 2015 12:25:32 -0500 From: Mans Rullgard To: Jean-Christophe Plagniol-Villard , Tomi Valkeinen , linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: marex@denx.de Subject: [PATCH 2/2] video: mxsfb: manage LCD_RESET signal according to reset-active property Date: Tue, 15 Dec 2015 17:24:57 +0000 Message-Id: <1450200297-19243-2-git-send-email-mans@mansr.com> X-Mailer: git-send-email 2.6.3 In-Reply-To: <1450200297-19243-1-git-send-email-mans@mansr.com> References: <1450200297-19243-1-git-send-email-mans@mansr.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4343 Lines: 131 Activate/deactivate the LCD_RESET signal as specified by the reset-active DT property when the controller is disabled/enabled. If the property is missing, leave the signal unchanged. Signed-off-by: Mans Rullgard --- drivers/video/fbdev/mxsfb.c | 28 +++++++++++++++++++++++++--- 1 file changed, 25 insertions(+), 3 deletions(-) diff --git a/drivers/video/fbdev/mxsfb.c b/drivers/video/fbdev/mxsfb.c index 4e6608c..0200a0f 100644 --- a/drivers/video/fbdev/mxsfb.c +++ b/drivers/video/fbdev/mxsfb.c @@ -99,6 +99,7 @@ #define CTRL1_FIFO_CLEAR (1 << 21) #define CTRL1_SET_BYTE_PACKAGING(x) (((x) & 0xf) << 16) #define CTRL1_GET_BYTE_PACKAGING(x) (((x) >> 16) & 0xf) +#define CTRL1_RESET (1 << 0) #define TRANSFER_COUNT_SET_VCOUNT(x) (((x) & 0xffff) << 16) #define TRANSFER_COUNT_GET_VCOUNT(x) (((x) >> 16) & 0xffff) @@ -152,6 +153,9 @@ #define MXSFB_SYNC_DATA_ENABLE_HIGH_ACT (1 << 6) #define MXSFB_SYNC_DOTCLK_FALLING_ACT (1 << 7) /* negtive edge sampling */ +#define MXSFB_RESET_LOW 1 +#define MXSFB_RESET_HIGH 2 + enum mxsfb_devtype { MXSFB_V3, MXSFB_V4, @@ -181,6 +185,7 @@ struct mxsfb_info { unsigned dotclk_delay; const struct mxsfb_devdata *devdata; u32 sync; + u32 reset; struct regulator *reg_lcd; }; @@ -362,6 +367,11 @@ static void mxsfb_enable_controller(struct fb_info *fb_info) writel(CTRL_RUN, host->base + LCDC_CTRL + REG_SET); + if (host->reset == MXSFB_RESET_HIGH) + writel(CTRL1_RESET, host->base + LCDC_CTRL1 + REG_CLR); + else if (host->reset == MXSFB_RESET_LOW) + writel(CTRL1_RESET, host->base + LCDC_CTRL1 + REG_SET); + host->enabled = 1; } @@ -388,6 +398,11 @@ static void mxsfb_disable_controller(struct fb_info *fb_info) loop--; } + if (host->reset == MXSFB_RESET_HIGH) + writel(CTRL1_RESET, host->base + LCDC_CTRL1 + REG_SET); + else if (host->reset == MXSFB_RESET_LOW) + writel(CTRL1_RESET, host->base + LCDC_CTRL1 + REG_CLR); + reg = readl(host->base + LCDC_VDCTRL4); writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4); @@ -410,7 +425,7 @@ static void mxsfb_disable_controller(struct fb_info *fb_info) static int mxsfb_set_par(struct fb_info *fb_info) { struct mxsfb_info *host = to_imxfb_host(fb_info); - u32 ctrl, vdctrl0, vdctrl4; + u32 ctrl, ctrl1, vdctrl0, vdctrl4; int line_size, fb_size; int reenable = 0; @@ -439,12 +454,13 @@ static int mxsfb_set_par(struct fb_info *fb_info) ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER | CTRL_SET_BUS_WIDTH(host->ld_intf_width); + ctrl1 = readl(host->base + LCDC_CTRL1) & CTRL1_RESET; switch (fb_info->var.bits_per_pixel) { case 16: dev_dbg(&host->pdev->dev, "Setting up RGB565 mode\n"); ctrl |= CTRL_SET_WORD_LENGTH(0); - writel(CTRL1_SET_BYTE_PACKAGING(0xf), host->base + LCDC_CTRL1); + ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0xf); break; case 32: dev_dbg(&host->pdev->dev, "Setting up RGB888/666 mode\n"); @@ -462,7 +478,7 @@ static int mxsfb_set_par(struct fb_info *fb_info) break; } /* do not use packed pixels = one pixel per word instead */ - writel(CTRL1_SET_BYTE_PACKAGING(0x7), host->base + LCDC_CTRL1); + ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0x7); break; default: mxsfb_disable_axi_clk(host); @@ -472,6 +488,7 @@ static int mxsfb_set_par(struct fb_info *fb_info) } writel(ctrl, host->base + LCDC_CTRL); + writel(ctrl1, host->base + LCDC_CTRL1); writel(TRANSFER_COUNT_SET_VCOUNT(fb_info->var.yres) | TRANSFER_COUNT_SET_HCOUNT(fb_info->var.xres), @@ -736,6 +753,7 @@ static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host, struct device_node *display_np; struct videomode vm; u32 width; + u32 reset; int ret; display_np = of_parse_phandle(np, "display", 0); @@ -776,6 +794,10 @@ static int mxsfb_init_fbinfo_dt(struct mxsfb_info *host, goto put_display_node; } + ret = of_property_read_u32(display_np, "reset-active", &reset); + if (!ret) + host->reset = reset ? MXSFB_RESET_HIGH : MXSFB_RESET_LOW; + ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE); if (ret) { dev_err(dev, "failed to get videomode from DT\n"); -- 2.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/