From patchwork Wed Aug 22 05:58:23 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Manjunathappa, Prakash" X-Patchwork-Id: 1359381 Return-Path: X-Original-To: patchwork-linux-fbdev@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 2620A40B05 for ; Wed, 22 Aug 2012 06:14:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752109Ab2HVGOo (ORCPT ); Wed, 22 Aug 2012 02:14:44 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:49516 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751460Ab2HVGOd (ORCPT ); Wed, 22 Aug 2012 02:14:33 -0400 Received: from dbdp20.itg.ti.com ([172.24.170.38]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id q7M6ETqE003408; Wed, 22 Aug 2012 01:14:30 -0500 Received: from DBDE71.ent.ti.com (localhost [127.0.0.1]) by dbdp20.itg.ti.com (8.13.8/8.13.8) with ESMTP id q7M6EQdJ019286; Wed, 22 Aug 2012 11:44:26 +0530 (IST) Received: from dbdp32.itg.ti.com (172.24.170.251) by DBDE71.ent.ti.com (172.24.170.149) with Microsoft SMTP Server id 14.1.323.3; Wed, 22 Aug 2012 11:44:26 +0530 Received: from ucmsshproxy.india.ext.ti.com (dbdp20.itg.ti.com [172.24.170.38]) by dbdp32.itg.ti.com (8.13.8/8.13.8) with SMTP id q7M6EOpU002227; Wed, 22 Aug 2012 11:44:25 +0530 Received: from symphony.india.ext.ti.com (unknown [192.168.247.13]) by ucmsshproxy.india.ext.ti.com (Postfix) with ESMTP id C52FC158002; Wed, 22 Aug 2012 11:44:24 +0530 (IST) Received: from linux-psp-server.india.ext.ti.com (linux-psp-server [192.168.247.76]) by symphony.india.ext.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id q7M6ENI16011; Wed, 22 Aug 2012 11:44:23 +0530 (IST) From: "Manjunathappa, Prakash" To: CC: Florian Tobias Schandinat , , "Manjunathappa, Prakash" Subject: [PATCH v4] da8xx-fb: allow frame to complete after disabling LCDC Date: Wed, 22 Aug 2012 11:28:23 +0530 Message-ID: <1345615103-32009-1-git-send-email-prakash.pm@ti.com> X-Mailer: git-send-email 1.7.1 MIME-Version: 1.0 Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Wait for active frame transfer to complete after disabling LCDC. At the same this wait is not be required when there are sync and underflow errors. Patch applies for revision 2 of LCDC present am335x. More information on disable and reset sequence can be found in section 13.4.6 of AM335x TRM @www.ti.com/am335x. Signed-off-by: Manjunathappa, Prakash --- Applies on top of fbdev-next of Florian Tobias Schandinat's tree. Since v3: Rely on frame done interrupt instead of polling for it. Since v2: Optimized the lcd_disable_raster function. Since v1: Changed the commit message, also added link to hardware specification. drivers/video/da8xx-fb.c | 53 +++++++++++++++++++++++++++++++++++---------- 1 files changed, 41 insertions(+), 12 deletions(-) diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c index 7ae9d53..8fb497a 100644 --- a/drivers/video/da8xx-fb.c +++ b/drivers/video/da8xx-fb.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -48,6 +49,7 @@ #define LCD_PL_LOAD_DONE BIT(6) #define LCD_FIFO_UNDERFLOW BIT(5) #define LCD_SYNC_LOST BIT(2) +#define LCD_FRAME_DONE BIT(0) /* LCD DMA Control Register */ #define LCD_DMA_BURST_SIZE(x) ((x) << 4) @@ -135,6 +137,8 @@ static resource_size_t da8xx_fb_reg_base; static struct resource *lcdc_regs; static unsigned int lcd_revision; static irq_handler_t lcdc_irq_handler; +static wait_queue_head_t frame_done_wq; +static int frame_done_flag; static inline unsigned int lcdc_read(unsigned int addr) { @@ -288,13 +292,27 @@ static inline void lcd_enable_raster(void) } /* Disable the Raster Engine of the LCD Controller */ -static inline void lcd_disable_raster(void) +static inline void lcd_disable_raster(bool wait_for_frame_done) { u32 reg; + int ret; reg = lcdc_read(LCD_RASTER_CTRL_REG); if (reg & LCD_RASTER_ENABLE) lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG); + else + /* return if already disabled */ + return; + + if ((wait_for_frame_done == true) && (lcd_revision == LCD_VERSION_2)) { + + frame_done_flag = 0; + ret = wait_event_interruptible_timeout(frame_done_wq, + frame_done_flag != 0, + msecs_to_jiffies(50)); + if (ret == 0) + pr_err("LCD Controller timed out\n"); + } } static void lcd_blit(int load_mode, struct da8xx_fb_par *par) @@ -321,7 +339,8 @@ static void lcd_blit(int load_mode, struct da8xx_fb_par *par) } else { reg_int = lcdc_read(LCD_INT_ENABLE_SET_REG) | LCD_V2_END_OF_FRAME0_INT_ENA | - LCD_V2_END_OF_FRAME1_INT_ENA; + LCD_V2_END_OF_FRAME1_INT_ENA | + LCD_FRAME_DONE; lcdc_write(reg_int, LCD_INT_ENABLE_SET_REG); } reg_dma |= LCD_DUAL_FRAME_BUFFER_ENABLE; @@ -638,7 +657,7 @@ static int fb_setcolreg(unsigned regno, unsigned red, unsigned green, static void lcd_reset(struct da8xx_fb_par *par) { /* Disable the Raster if previously Enabled */ - lcd_disable_raster(); + lcd_disable_raster(false); /* DMA has to be disabled */ lcdc_write(0, LCD_DMA_CTRL_REG); @@ -734,7 +753,7 @@ static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg) u32 stat = lcdc_read(LCD_MASKED_STAT_REG); if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) { - lcd_disable_raster(); + lcd_disable_raster(false); lcdc_write(stat, LCD_MASKED_STAT_REG); lcd_enable_raster(); } else if (stat & LCD_PL_LOAD_DONE) { @@ -744,7 +763,7 @@ static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg) * interrupt via the following write to the status register. If * this is done after then one gets multiple PL done interrupts. */ - lcd_disable_raster(); + lcd_disable_raster(false); lcdc_write(stat, LCD_MASKED_STAT_REG); @@ -775,6 +794,14 @@ static irqreturn_t lcdc_irq_handler_rev02(int irq, void *arg) par->vsync_flag = 1; wake_up_interruptible(&par->vsync_wait); } + + /* Set only when controller is disabled and at the end of + * active frame + */ + if (stat & BIT(0)) { + frame_done_flag = 1; + wake_up_interruptible(&frame_done_wq); + } } lcdc_write(0, LCD_END_OF_INT_IND_REG); @@ -789,7 +816,7 @@ static irqreturn_t lcdc_irq_handler_rev01(int irq, void *arg) u32 reg_ras; if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) { - lcd_disable_raster(); + lcd_disable_raster(false); lcdc_write(stat, LCD_STAT_REG); lcd_enable_raster(); } else if (stat & LCD_PL_LOAD_DONE) { @@ -799,7 +826,7 @@ static irqreturn_t lcdc_irq_handler_rev01(int irq, void *arg) * interrupt via the following write to the status register. If * this is done after then one gets multiple PL done interrupts. */ - lcd_disable_raster(); + lcd_disable_raster(false); lcdc_write(stat, LCD_STAT_REG); @@ -898,7 +925,7 @@ static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb, if (val == CPUFREQ_POSTCHANGE) { if (par->lcd_fck_rate != clk_get_rate(par->lcdc_clk)) { par->lcd_fck_rate = clk_get_rate(par->lcdc_clk); - lcd_disable_raster(); + lcd_disable_raster(true); lcd_calc_clk_divider(par); lcd_enable_raster(); } @@ -935,7 +962,7 @@ static int __devexit fb_remove(struct platform_device *dev) if (par->panel_power_ctrl) par->panel_power_ctrl(0); - lcd_disable_raster(); + lcd_disable_raster(true); lcdc_write(0, LCD_RASTER_CTRL_REG); /* disable DMA */ @@ -1051,7 +1078,7 @@ static int cfb_blank(int blank, struct fb_info *info) if (par->panel_power_ctrl) par->panel_power_ctrl(0); - lcd_disable_raster(); + lcd_disable_raster(true); break; default: ret = -EINVAL; @@ -1356,8 +1383,10 @@ static int __devinit fb_probe(struct platform_device *device) if (lcd_revision == LCD_VERSION_1) lcdc_irq_handler = lcdc_irq_handler_rev01; - else + else { + init_waitqueue_head(&frame_done_wq); lcdc_irq_handler = lcdc_irq_handler_rev02; + } ret = request_irq(par->irq, lcdc_irq_handler, 0, DRIVER_NAME, par); @@ -1411,7 +1440,7 @@ static int fb_suspend(struct platform_device *dev, pm_message_t state) par->panel_power_ctrl(0); fb_set_suspend(info, 1); - lcd_disable_raster(); + lcd_disable_raster(true); clk_disable(par->lcdc_clk); console_unlock();