video: da8xx-fb: reset LCDC only if functional clock changes with DVFS

LCDC functional clock may or may not be derived from CPU/MPU DPLL,
For example,
AM335x => Separate independent DPLL for LCDC
Davinci => Same DPLL as MPU

So, on platforms where LCDC functional clock is not derived from CPU/MPU
PLL it is not required to reset LCDC module as its functional clock does
not change with DVFS.

This patch adds check to do reset only if functional clock changes
between pre and post notifier callbacks with DVFS.

Signed-off-by: Manjunathappa, Prakash <prakash.pm@ti.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 29577bf1f559..9ecc30744c6a 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -161,6 +161,7 @@ struct da8xx_fb_par {
         int                     vsync_timeout;
 #ifdef CONFIG_CPU_FREQ
         struct notifier_block   freq_transition;
+        unsigned int            lcd_fck_rate;
 #endif
         void (*panel_power_ctrl)(int);
 };
@@ -840,11 +841,13 @@ static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
         struct da8xx_fb_par *par;
 
         par = container_of(nb, struct da8xx_fb_par, freq_transition);
-        if (val == CPUFREQ_PRECHANGE) {
-                lcd_disable_raster();
-        } else if (val == CPUFREQ_POSTCHANGE) {
-                lcd_calc_clk_divider(par);
-                lcd_enable_raster();
+        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_calc_clk_divider(par);
+                        lcd_enable_raster();
+                }
         }
 
         return 0;
@@ -1137,6 +1140,9 @@ static int __devinit fb_probe(struct platform_device *device)
 
         par = da8xx_fb_info->par;
         par->lcdc_clk = fb_clk;
+#ifdef CONFIG_CPU_FREQ
+        par->lcd_fck_rate = clk_get_rate(fb_clk);
+#endif
         par->pxl_clk = lcdc_info->pxl_clk;
         if (fb_pdata->panel_power_ctrl) {
                 par->panel_power_ctrl = fb_pdata->panel_power_ctrl;