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8a094f508c
The LCDC IP-core an be feed from several clock sources, one of those is a dedicated DPLL for generating a dividable base-clock for this IP-core. The TRM specifies the maximum input frequency for the LCCD with 200 MHz, so we must not exceed this value with the PLL frequency (which can lock much higher). This patch tries every combination of multipliers and divisors of the PLL and the IP-core itself for getting as near as possible the the requested panel->pxl_clk. Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at> Reviewed-by: Anatolij Gustschin <agust@denx.de>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Copyright (C) 2013-2018 Hannes Schmelzer <oe5hpm@oevsv.at> -
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* B&R Industrial Automation GmbH - http://www.br-automation.com
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef AM335X_FB_H
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#define AM335X_FB_H
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#define HSVS_CONTROL (0x01 << 25) /*
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* 0 = lcd_lp and lcd_fp are driven on
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* opposite edges of pixel clock than
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* the lcd_pixel_o
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* 1 = lcd_lp and lcd_fp are driven
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* according to bit 24 Note that this
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* bit MUST be set to '0' for Passive
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* Matrix displays the edge timing is
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* fixed
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*/
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#define HSVS_RISEFALL (0x01 << 24) /*
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* 0 = lcd_lp and lcd_fp are driven on
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* the rising edge of pixel clock (bit
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* 25 must be set to 1)
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* 1 = lcd_lp and lcd_fp are driven on
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* the falling edge of pixel clock (bit
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* 25 must be set to 1)
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*/
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#define DE_INVERT (0x01 << 23) /*
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* 0 = DE is low-active
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* 1 = DE is high-active
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*/
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#define PXCLK_INVERT (0x01 << 22) /*
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* 0 = pix-clk is high-active
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* 1 = pic-clk is low-active
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*/
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#define HSYNC_INVERT (0x01 << 21) /*
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* 0 = HSYNC is active high
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* 1 = HSYNC is avtive low
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*/
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#define VSYNC_INVERT (0x01 << 20) /*
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* 0 = VSYNC is active high
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* 1 = VSYNC is active low
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*/
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struct am335x_lcdpanel {
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unsigned int hactive; /* Horizontal active area */
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unsigned int vactive; /* Vertical active area */
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unsigned int bpp; /* bits per pixel */
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unsigned int hfp; /* Horizontal front porch */
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unsigned int hbp; /* Horizontal back porch */
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unsigned int hsw; /* Horizontal Sync Pulse Width */
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unsigned int vfp; /* Vertical front porch */
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unsigned int vbp; /* Vertical back porch */
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unsigned int vsw; /* Vertical Sync Pulse Width */
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unsigned int pxl_clk; /* Pixel clock */
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unsigned int pol; /* polarity of sync, clock signals */
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unsigned int pup_delay; /*
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* time in ms after power on to
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* initialization of lcd-controller
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* (VCC ramp up time)
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*/
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unsigned int pon_delay; /*
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* time in ms after initialization of
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* lcd-controller (pic stabilization)
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*/
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void (*panel_power_ctrl)(int); /* fp for power on/off display */
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};
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int am335xfb_init(struct am335x_lcdpanel *panel);
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#endif /* AM335X_FB_H */
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