> -----Original Message----- > From: devicetree-discuss [mailto:devicetree-discuss- > bounces+hvaibhav=ti.com@xxxxxxxxxxxxxxxx] On Behalf Of Michal Bachraty > Sent: Thursday, March 28, 2013 11:02 PM > To: dri-devel@xxxxxxxxxxxxxxxxxxxxx; devicetree- > discuss@xxxxxxxxxxxxxxxx > Cc: robdclark@xxxxxxxxx; koen@xxxxxxxxxxxxxxxxxxxxx > Subject: drm/tilcdc: LCD panels clocks initialization and earlier > backlight initialization > > Hi, > > I'm trying to use tilcdc driver for KWH050TG08 LCD panel connected to > AM335x > processor (3.9 rc1 kernel). I have prepared DT bindings for that > (listed > bellow). I see fb0 device but I have no clocks going from cpu to LCD. > My > clocks for LCD seems not properly to be set ... > > virt_25000000_ck 1 1 25000000 > sys_clkin_ck 8 19 25000000 > dpll_disp_ck 0 1 25000000 > dpll_disp_m2_ck 0 1 25000000 > lcd_gclk 0 1 25000000 > > and tilcdc_crtc is not called. I also set lcd_gclk to 300MHz, but I got > same > result. The question is there any way how to properly set clocks for > LCD? > Not sure about the LCDC DRM driver, but I just tested clk_set_rate() For lcdc_gclk clock and it is working for me. I could able to set 300MHz freq on my BeagleBone platform, with below code - diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c index e54a480..443fb26 100644 --- a/arch/arm/mach-omap2/board-generic.c +++ b/arch/arm/mach-omap2/board-generic.c @@ -11,6 +11,7 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ +#include <linux/clk-private.h> #include <linux/io.h> #include <linux/of_irq.h> #include <linux/of_platform.h> @@ -37,6 +38,8 @@ static struct of_device_id omap_dt_match_table[] __initdata = { static void __init omap_generic_init(void) { + struct clk *clk; + omap_sdrc_init(NULL, NULL); of_platform_populate(NULL, omap_dt_match_table, NULL, NULL); @@ -49,6 +52,15 @@ static void __init omap_generic_init(void) omap4_panda_display_init_of(); else if (of_machine_is_compatible("ti,omap4-sdp")) omap_4430sdp_display_init_of(); + + clk = clk_get(NULL, "lcd_gclk"); + if (IS_ERR(clk)) + printk("Can not get lcd_gclk clock\n"); + + printk("%s:%d gclk_rate - %lu\n", __func__, __LINE__, clk_get_rate(clk)); + clk_set_rate(clk, 300000000); + printk("%s:%d clk_rate - %lu\n", __func__, __LINE__, clk_get_rate(clk)); + clk_put(clk); } #ifdef CONFIG_SOC_OMAP2420 Thanks, Vaibhav _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
