struct mxc_epdc_fb_mode {
struct fb_videomode *vmode;
int vscan_holdoff;
int sdoed_width;
int sdoed_delay;
int sdoez_width;
int sdoez_delay;
int gdclk_hp_offs;
int gdsp_offs;
int gdoe_offs;
int gdclk_offs;
int num_ce;
};
The mxc_epdc_fb_mode structure consists of an fb_videomode structure and a set of
EPD timing parameters. The fb_videomode structure defines the panel resolution and the
basic timing parameters (pixel clock frequency, hsync and vsync margins) and the
additional timing parameters in mxc_epdc_fb_mode define EPD-specific timing
parameters, such as the source and gate driver timings. Please refer to the EPDC
programming model section within the iMX6SLDRM for details on how E Ink panel
timing parameters should be configured.
This EPDC panel mode is part of the mxc_epdc_fb_platform_data structure that is passed
to the EPDC driver during driver registration.
struct mxc_epdc_fb_platform_data {
struct mxc_epdc_fb_mode *epdc_mode;
int num_modes;
void (*get_pins) (void);
void (*put_pins) (void);
void (*enable_pins) (void);
void (*disable_pins) (void);
};
In addition to the EPDC panel mode data, functions may be passed to the EPDC driver to
define how to handle the EPDC pins when the EPDC driver is enabled or disabled. These
functions should disable the EPDC pins for purposes of power savings.
9.3.3.1 Boot Command Line Parameters
Additional configuration for the EPDC driver is provided through boot command line
parameters. The format of the command line option is as follows:
epdc video=mxcepdcfb:[panel_name],bpp=16
The EPDC driver parses these options and tries to match panel_name to the name of
video mode specified in the mxc_epdc_fb_mode panel mode structure. If no match is
found, then the first panel mode provided in the platform data is used by the EPDC
driver. The bpp setting from this command line sets the initial bits per pixel setting for
the frame buffer. A setting of 16 selects RGB565 pixel format, while a setting of 8 selects
8-bit grayscale (Y8) format.
Software Operation
i.MX 6Solo/6DualLite Linux Reference Manual, Rev. L3.0.35_4.1.0, 09/2013
86
Freescale Semiconductor, Inc.
