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authorChaithrika U S <chaithrika@ti.com>2009-12-15 19:46:38 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 10:20:04 -0500
commit3611380490c6ce27a2277709a34b8c5531524caf (patch)
tree0afbddaa57a0aac765d1ddf7a93e30706300ac1f
parentfa1f136e073ddc4e60497c51bc8918569314d38a (diff)
davinci: fb: update the driver in preparation for addition of power management features
Add a helper function to enable raster. Also add one member in the private data structure to track the current blank status, another function pointer which takes in the platform specific callback function to control panel power. These updates will help in adding suspend/resume and frame buffer blank operation features. Signed-off-by: Chaithrika U S <chaithrika@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/video/da8xx-fb.c43
-rw-r--r--include/video/da8xx-fb.h1
2 files changed, 28 insertions, 16 deletions
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 8966274bbbbc..eb95b893e8b2 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -115,9 +115,11 @@ struct da8xx_fb_par {
115 unsigned int databuf_sz; 115 unsigned int databuf_sz;
116 unsigned int palette_sz; 116 unsigned int palette_sz;
117 unsigned int pxl_clk; 117 unsigned int pxl_clk;
118 int blank;
118#ifdef CONFIG_CPU_FREQ 119#ifdef CONFIG_CPU_FREQ
119 struct notifier_block freq_transition; 120 struct notifier_block freq_transition;
120#endif 121#endif
122 void (*panel_power_ctrl)(int);
121}; 123};
122 124
123/* Variable Screen Information */ 125/* Variable Screen Information */
@@ -195,8 +197,18 @@ static struct da8xx_panel known_lcd_panels[] = {
195 }, 197 },
196}; 198};
197 199
200/* Enable the Raster Engine of the LCD Controller */
201static inline void lcd_enable_raster(void)
202{
203 u32 reg;
204
205 reg = lcdc_read(LCD_RASTER_CTRL_REG);
206 if (!(reg & LCD_RASTER_ENABLE))
207 lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
208}
209
198/* Disable the Raster Engine of the LCD Controller */ 210/* Disable the Raster Engine of the LCD Controller */
199static void lcd_disable_raster(struct da8xx_fb_par *par) 211static inline void lcd_disable_raster(void)
200{ 212{
201 u32 reg; 213 u32 reg;
202 214
@@ -448,8 +460,7 @@ static int fb_setcolreg(unsigned regno, unsigned red, unsigned green,
448static void lcd_reset(struct da8xx_fb_par *par) 460static void lcd_reset(struct da8xx_fb_par *par)
449{ 461{
450 /* Disable the Raster if previously Enabled */ 462 /* Disable the Raster if previously Enabled */
451 if (lcdc_read(LCD_RASTER_CTRL_REG) & LCD_RASTER_ENABLE) 463 lcd_disable_raster();
452 lcd_disable_raster(par);
453 464
454 /* DMA has to be disabled */ 465 /* DMA has to be disabled */
455 lcdc_write(0, LCD_DMA_CTRL_REG); 466 lcdc_write(0, LCD_DMA_CTRL_REG);
@@ -529,13 +540,11 @@ static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
529static irqreturn_t lcdc_irq_handler(int irq, void *arg) 540static irqreturn_t lcdc_irq_handler(int irq, void *arg)
530{ 541{
531 u32 stat = lcdc_read(LCD_STAT_REG); 542 u32 stat = lcdc_read(LCD_STAT_REG);
532 u32 reg;
533 543
534 if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) { 544 if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
535 reg = lcdc_read(LCD_RASTER_CTRL_REG); 545 lcd_disable_raster();
536 lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
537 lcdc_write(stat, LCD_STAT_REG); 546 lcdc_write(stat, LCD_STAT_REG);
538 lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG); 547 lcd_enable_raster();
539 } else 548 } else
540 lcdc_write(stat, LCD_STAT_REG); 549 lcdc_write(stat, LCD_STAT_REG);
541 550
@@ -595,16 +604,13 @@ static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
595 unsigned long val, void *data) 604 unsigned long val, void *data)
596{ 605{
597 struct da8xx_fb_par *par; 606 struct da8xx_fb_par *par;
598 unsigned int reg;
599 607
600 par = container_of(nb, struct da8xx_fb_par, freq_transition); 608 par = container_of(nb, struct da8xx_fb_par, freq_transition);
601 if (val == CPUFREQ_PRECHANGE) { 609 if (val == CPUFREQ_PRECHANGE) {
602 reg = lcdc_read(LCD_RASTER_CTRL_REG); 610 lcd_disable_raster();
603 lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
604 } else if (val == CPUFREQ_POSTCHANGE) { 611 } else if (val == CPUFREQ_POSTCHANGE) {
605 lcd_calc_clk_divider(par); 612 lcd_calc_clk_divider(par);
606 reg = lcdc_read(LCD_RASTER_CTRL_REG); 613 lcd_enable_raster();
607 lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
608 } 614 }
609 615
610 return 0; 616 return 0;
@@ -635,8 +641,10 @@ static int __devexit fb_remove(struct platform_device *dev)
635#ifdef CONFIG_CPU_FREQ 641#ifdef CONFIG_CPU_FREQ
636 lcd_da8xx_cpufreq_deregister(par); 642 lcd_da8xx_cpufreq_deregister(par);
637#endif 643#endif
638 if (lcdc_read(LCD_RASTER_CTRL_REG) & LCD_RASTER_ENABLE) 644 if (par->panel_power_ctrl)
639 lcd_disable_raster(par); 645 par->panel_power_ctrl(0);
646
647 lcd_disable_raster();
640 lcdc_write(0, LCD_RASTER_CTRL_REG); 648 lcdc_write(0, LCD_RASTER_CTRL_REG);
641 649
642 /* disable DMA */ 650 /* disable DMA */
@@ -777,6 +785,10 @@ static int __init fb_probe(struct platform_device *device)
777 par = da8xx_fb_info->par; 785 par = da8xx_fb_info->par;
778 par->lcdc_clk = fb_clk; 786 par->lcdc_clk = fb_clk;
779 par->pxl_clk = lcdc_info->pxl_clk; 787 par->pxl_clk = lcdc_info->pxl_clk;
788 if (fb_pdata->panel_power_ctrl) {
789 par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
790 par->panel_power_ctrl(1);
791 }
780 792
781 if (lcd_init(par, lcd_cfg, lcdc_info) < 0) { 793 if (lcd_init(par, lcd_cfg, lcdc_info) < 0) {
782 dev_err(&device->dev, "lcd_init failed\n"); 794 dev_err(&device->dev, "lcd_init failed\n");
@@ -877,8 +889,7 @@ static int __init fb_probe(struct platform_device *device)
877#endif 889#endif
878 890
879 /* enable raster engine */ 891 /* enable raster engine */
880 lcdc_write(lcdc_read(LCD_RASTER_CTRL_REG) | 892 lcd_enable_raster();
881 LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
882 893
883 return 0; 894 return 0;
884 895
diff --git a/include/video/da8xx-fb.h b/include/video/da8xx-fb.h
index c051a50ed528..89d43b3d4cb9 100644
--- a/include/video/da8xx-fb.h
+++ b/include/video/da8xx-fb.h
@@ -38,6 +38,7 @@ struct da8xx_lcdc_platform_data {
38 const char manu_name[10]; 38 const char manu_name[10];
39 void *controller_data; 39 void *controller_data;
40 const char type[25]; 40 const char type[25];
41 void (*panel_power_ctrl)(int);
41}; 42};
42 43
43struct lcd_ctrl_config { 44struct lcd_ctrl_config {