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35 lines
932 B
35 lines
932 B
20 years ago
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#include <linux/config.h>
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#define acornfb_valid_pixrate(var) (var->pixclock >= 39325 && var->pixclock <= 40119)
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static inline void
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acornfb_vidc20_find_rates(struct vidc_timing *vidc,
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struct fb_var_screeninfo *var)
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{
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u_int bandwidth;
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vidc->control |= VIDC20_CTRL_PIX_CK;
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/* Calculate bandwidth */
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bandwidth = var->pixclock * 8 / var->bits_per_pixel;
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/* Encode bandwidth as VIDC20 setting */
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if (bandwidth > 16667*2)
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vidc->control |= VIDC20_CTRL_FIFO_16;
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else if (bandwidth > 13333*2)
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vidc->control |= VIDC20_CTRL_FIFO_20;
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else if (bandwidth > 11111*2)
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vidc->control |= VIDC20_CTRL_FIFO_24;
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else
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vidc->control |= VIDC20_CTRL_FIFO_28;
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vidc->pll_ctl = 0x2020;
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}
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#ifdef CONFIG_CHRONTEL_7003
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#define acornfb_default_control() VIDC20_CTRL_PIX_HCLK
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#else
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#define acornfb_default_control() VIDC20_CTRL_PIX_VCLK
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#endif
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#define acornfb_default_econtrol() VIDC20_ECTL_DAC | VIDC20_ECTL_REG(3) | VIDC20_ECTL_ECK
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