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authorAndrea Bastoni <bastoni@cs.unc.edu>2010-05-30 19:16:45 -0400
committerAndrea Bastoni <bastoni@cs.unc.edu>2010-05-30 19:16:45 -0400
commitada47b5fe13d89735805b566185f4885f5a3f750 (patch)
tree644b88f8a71896307d71438e9b3af49126ffb22b /drivers/video/s3c-fb.c
parent43e98717ad40a4ae64545b5ba047c7b86aa44f4f (diff)
parent3280f21d43ee541f97f8cda5792150d2dbec20d5 (diff)
Merge branch 'wip-2.6.34' into old-private-masterarchived-private-master
Diffstat (limited to 'drivers/video/s3c-fb.c')
-rw-r--r--drivers/video/s3c-fb.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index adf9632c6b1f..9682ecc60e12 100644
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -16,8 +16,8 @@
16#include <linux/module.h> 16#include <linux/module.h>
17#include <linux/platform_device.h> 17#include <linux/platform_device.h>
18#include <linux/dma-mapping.h> 18#include <linux/dma-mapping.h>
19#include <linux/slab.h>
19#include <linux/init.h> 20#include <linux/init.h>
20#include <linux/gfp.h>
21#include <linux/clk.h> 21#include <linux/clk.h>
22#include <linux/fb.h> 22#include <linux/fb.h>
23#include <linux/io.h> 23#include <linux/io.h>
@@ -211,21 +211,23 @@ static int s3c_fb_check_var(struct fb_var_screeninfo *var,
211 211
212/** 212/**
213 * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock. 213 * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock.
214 * @id: window id.
215 * @sfb: The hardware state. 214 * @sfb: The hardware state.
216 * @pixclock: The pixel clock wanted, in picoseconds. 215 * @pixclock: The pixel clock wanted, in picoseconds.
217 * 216 *
218 * Given the specified pixel clock, work out the necessary divider to get 217 * Given the specified pixel clock, work out the necessary divider to get
219 * close to the output frequency. 218 * close to the output frequency.
220 */ 219 */
221static int s3c_fb_calc_pixclk(unsigned char id, struct s3c_fb *sfb, unsigned int pixclk) 220static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
222{ 221{
223 struct s3c_fb_pd_win *win = sfb->pdata->win[id];
224 unsigned long clk = clk_get_rate(sfb->bus_clk); 222 unsigned long clk = clk_get_rate(sfb->bus_clk);
223 unsigned long long tmp;
225 unsigned int result; 224 unsigned int result;
226 225
227 pixclk *= win->win_mode.refresh; 226 tmp = (unsigned long long)clk;
228 result = clk / pixclk; 227 tmp *= pixclk;
228
229 do_div(tmp, 1000000000UL);
230 result = (unsigned int)tmp / 1000;
229 231
230 dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n", 232 dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
231 pixclk, clk, result, clk / result); 233 pixclk, clk, result, clk / result);
@@ -301,7 +303,7 @@ static int s3c_fb_set_par(struct fb_info *info)
301 /* use window 0 as the basis for the lcd output timings */ 303 /* use window 0 as the basis for the lcd output timings */
302 304
303 if (win_no == 0) { 305 if (win_no == 0) {
304 clkdiv = s3c_fb_calc_pixclk(win_no, sfb, var->pixclock); 306 clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);
305 307
306 data = sfb->pdata->vidcon0; 308 data = sfb->pdata->vidcon0;
307 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR); 309 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);