davinci: fb: calculate the clock divider from pixel clock info

The clock divider value can be calculated from the pixel clock value for
the panel.  This gives more flexiblity to the driver to change the divider
value on the fly as in the case of cpufreq feature- support for which will
be added shortly.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Cc: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: Steve Chen <schen@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 20 insertions, 8 deletions

diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index ea1fd3f47511..fe0025213a82 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -113,6 +113,7 @@ struct da8xx_fb_par {
         unsigned short pseudo_palette[16];
         unsigned int databuf_sz;
         unsigned int palette_sz;
+        unsigned int pxl_clk;
 };
 
 /* Variable Screen Information */
@@ -155,7 +156,7 @@ struct da8xx_panel {
         int             vfp;            /* Vertical front porch */
         int             vbp;            /* Vertical back porch */
         int             vsw;            /* Vertical Sync Pulse Width */
-        int             pxl_clk;        /* Pixel clock */
+        unsigned int    pxl_clk;        /* Pixel clock */
         unsigned char   invert_pxl_clk; /* Invert Pixel clock */
 };
 
@@ -171,7 +172,7 @@ static struct da8xx_panel known_lcd_panels[] = {
                 .vfp = 2,
                 .vbp = 2,
                 .vsw = 0,
-                .pxl_clk = 0x10,
+                .pxl_clk = 4608000,
                 .invert_pxl_clk = 1,
         },
         /* Sharp LK043T1DG01 */
@@ -185,7 +186,7 @@ static struct da8xx_panel known_lcd_panels[] = {
                 .vfp = 2,
                 .vbp = 2,
                 .vsw = 10,
-                .pxl_clk = 0x12,
+                .pxl_clk = 7833600,
                 .invert_pxl_clk = 0,
         },
 };
@@ -451,6 +452,18 @@ static void lcd_reset(struct da8xx_fb_par *par)
         lcdc_write(0, LCD_RASTER_CTRL_REG);
 }
 
+static void lcd_calc_clk_divider(struct da8xx_fb_par *par)
+{
+        unsigned int lcd_clk, div;
+
+        lcd_clk = clk_get_rate(par->lcdc_clk);
+        div = lcd_clk / par->pxl_clk;
+
+        /* Configure the LCD clock divisor. */
+        lcdc_write(LCD_CLK_DIVISOR(div) |
+                        (LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
+}
+
 static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
                 struct da8xx_panel *panel)
 {
@@ -459,9 +472,8 @@ static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
 
         lcd_reset(par);
 
-        /* Configure the LCD clock divisor. */
-        lcdc_write(LCD_CLK_DIVISOR(panel->pxl_clk) |
-                        (LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
+        /* Calculate the divider */
+        lcd_calc_clk_divider(par);
 
         if (panel->invert_pxl_clk)
                 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) |
@@ -721,6 +733,8 @@ static int __init fb_probe(struct platform_device *device)
         }
 
         par = da8xx_fb_info->par;
+        par->lcdc_clk = fb_clk;
+        par->pxl_clk = lcdc_info->pxl_clk;
 
         if (lcd_init(par, lcd_cfg, lcdc_info) < 0) {
                 dev_err(&device->dev, "lcd_init failed\n");
@@ -754,8 +768,6 @@ static int __init fb_probe(struct platform_device *device)
         da8xx_fb_fix.smem_len = par->databuf_sz - par->palette_sz;
         da8xx_fb_fix.line_length = (lcdc_info->width * lcd_cfg->bpp) / 8;
 
-        par->lcdc_clk = fb_clk;
-
         par->irq = platform_get_irq(device, 0);
         if (par->irq < 0) {
                 ret = -ENOENT;