| Message ID | 1345615103-32009-1-git-send-email-prakash.pm@ti.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Headers | show |
Hi, On Wed, Aug 22, 2012 at 11:28:23, Manjunathappa, Prakash wrote: > 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 <prakash.pm@ti.com> > --- > 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 <linux/platform_device.h> > #include <linux/uaccess.h> > #include <linux/interrupt.h> > +#include <linux/wait.h> > #include <linux/clk.h> > #include <linux/cpufreq.h> > #include <linux/console.h> > @@ -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)) { > + Will remove extra line space here, please let me know if you have any other comments. Thanks, Prakash > + 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(); > > -- > 1.7.1 > >
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 <linux/platform_device.h> #include <linux/uaccess.h> #include <linux/interrupt.h> +#include <linux/wait.h> #include <linux/clk.h> #include <linux/cpufreq.h> #include <linux/console.h> @@ -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();
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 <prakash.pm@ti.com> --- 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(-)