From: InKi Dae Date: Sun, 5 Jul 2009 19:08:21 +0000 (-0700) Subject: drivers/video/s3c-fb.c: fix clock setting for Samsung SoC Framebuffer X-Git-Tag: firefly_0821_release~13486 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=600ce1a0faafeed1ce6bcfd421bc040b941cbbc1;p=firefly-linux-kernel-4.4.55.git drivers/video/s3c-fb.c: fix clock setting for Samsung SoC Framebuffer Correct the CLKVAL_F field value of VIDEO MAIN CONTROLLER 0 REGITSTER. Frame Rate is 1 / [ { (VSPW+1) + (VBPD+1) + (LIINEVAL + 1) + (VFPD+1) } x {(HSPW+1) + (HBPD +1) + (HFPD+1) + (HOZVAL + 1) } x { ( CLKVAL+1 ) / ( Frequency of Clock source ) } ] and VCLK = Video Clock Source / (CLKVAL +1). therefore CLKVAL_F should be "CLKVAL_F = Frequency of Clock source / pixel clock * refresh". for this, I added refresh value in platform data like below. static struct s3c_fb_pd_win xxx_fb_win0 = { /* this is to ensure we use win0 */ .win_mode = { .refresh = 60, .pixclock = (66+4+2+480)*(15+5+3+800), .left_margin = 66, .right_margin = 2, .upper_margin = 15, .lower_margin = 3, .hsync_len = 4, .vsync_len = 5, .xres = 480, .yres = 800, }, .max_bpp = 32, .default_bpp = 24, }; static struct s3c_fb_platdata xxx_lcd_pdata __initdata = { .win[0] = &xxx_fb_win0, .vidcon0 = VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB, .vidcon1 = VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC | VIDCON1_INV_VCLK | VIDCON1_INV_VDEN, .setup_gpio = s5pc1xx_fb_gpio_setup_24bpp, }; xxx_machine_init() { . . . s3c_fb_set_platdata(&xxx_lcd_pdata); } platform data defined in machine code should be setting using s3c_fb_set_platdata(). Signed-off-by: InKi Dae Cc: Kyungmin Park Cc: Krzysztof Helt Cc: Marek Szyprowski Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c index 43680e545427..bb63c07e13de 100644 --- a/drivers/video/s3c-fb.c +++ b/drivers/video/s3c-fb.c @@ -211,23 +211,21 @@ static int s3c_fb_check_var(struct fb_var_screeninfo *var, /** * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock. + * @id: window id. * @sfb: The hardware state. * @pixclock: The pixel clock wanted, in picoseconds. * * Given the specified pixel clock, work out the necessary divider to get * close to the output frequency. */ -static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk) +static int s3c_fb_calc_pixclk(unsigned char id, struct s3c_fb *sfb, unsigned int pixclk) { + struct s3c_fb_pd_win *win = sfb->pdata->win[id]; unsigned long clk = clk_get_rate(sfb->bus_clk); - unsigned long long tmp; unsigned int result; - tmp = (unsigned long long)clk; - tmp *= pixclk; - - do_div(tmp, 1000000000UL); - result = (unsigned int)tmp / 1000; + pixclk *= win->win_mode.refresh; + result = clk / pixclk; dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n", pixclk, clk, result, clk / result); @@ -267,6 +265,7 @@ static int s3c_fb_set_par(struct fb_info *info) struct s3c_fb *sfb = win->parent; void __iomem *regs = sfb->regs; int win_no = win->index; + u32 osdc_data = 0; u32 data; u32 pagewidth; int clkdiv; @@ -302,7 +301,7 @@ static int s3c_fb_set_par(struct fb_info *info) /* use window 0 as the basis for the lcd output timings */ if (win_no == 0) { - clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock); + clkdiv = s3c_fb_calc_pixclk(win_no, sfb, var->pixclock); data = sfb->pdata->vidcon0; data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR); @@ -359,8 +358,6 @@ static int s3c_fb_set_par(struct fb_info *info) data = var->xres * var->yres; - u32 osdc_data = 0; - osdc_data = VIDISD14C_ALPHA1_R(0xf) | VIDISD14C_ALPHA1_G(0xf) | VIDISD14C_ALPHA1_B(0xf);