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>
diff --git a/drivers/video/da8xx-fb.c b/drivers/video/da8xx-fb.c
index 29577bf..9ecc307 100644
--- a/drivers/video/da8xx-fb.c
+++ b/drivers/video/da8xx-fb.c
@@ -161,6 +161,7 @@
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 @@
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 @@
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;