dss_get_dispc_clk_rate
r = dss_get_dispc_clk_rate(dispc->dss);
r = dss_get_dispc_clk_rate(dispc->dss);
dispc_calc_clock_rates(dispc, dss_get_dispc_clk_rate(dispc->dss),
unsigned long dss_get_dispc_clk_rate(struct dss_device *dss);
r = dss_get_dispc_clk_rate();
r = dss_get_dispc_clk_rate();
unsigned long dss_get_dispc_clk_rate(void);