Author: gonzo
Date: Thu Jan 29 01:59:42 2015
New Revision: 277871
URL: https://svnweb.freebsd.org/changeset/base/277871
Log:
Set LCDC clock frequency to 2*148500 KHz
Minimum LCDC is 2 so clock freq shouild be 2*max_pixel_clock. Maximum pixel
clock for HDMI is 148500 (1920x1080). But AM335x can not run in this mode
due to bandwidth and clock limitations
Modified:
head/sys/arm/ti/am335x/am335x_prcm.c
Modified: head/sys/arm/ti/am335x/am335x_prcm.c
==============================================================================
--- head/sys/arm/ti/am335x/am335x_prcm.c Thu Jan 29 01:55:24 2015
(r277870)
+++ head/sys/arm/ti/am335x/am335x_prcm.c Thu Jan 29 01:59:42 2015
(r277871)
@@ -729,10 +729,10 @@ am335x_clk_lcdc_activate(struct ti_clock
DELAY(10);
/*
- * For now set frequency to 5xSYSFREQ
- * More flexible control might be required
+ * For now set frequency to 99*SYSFREQ/8 which is twice as
+ * HDMI 1080p pixel clock (minimum LCDC freq divisor is 2)
*/
- prcm_write_4(CM_WKUP_CM_CLKSEL_DPLL_DISP, (5 << 8) | 0);
+ prcm_write_4(CM_WKUP_CM_CLKSEL_DPLL_DISP, (99 << 8) | 8);
/* Locked mode */
prcm_write_4(CM_WKUP_CM_CLKMODE_DPLL_DISP, 0x7);
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