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CVS commit: src/sys/arch/arm/xscale

Module Name:    src
Committed By:   tsutsui
Date:           Sun Aug  8 11:24:52 UTC 2010

Modified Files:
        src/sys/arch/arm/xscale: pxa2x0_lcd.c

Log Message:
Allow pxa2x0_lcd driver mapping screen buffer memory cachable with
write-through map (i.e. map it without BUS_DMA_COHERENT) since
currently all DMA data transfers are memory to device only.

Disabled by default, but enabled by "options PXA2X0_LCD_WRITETHROUGH"
or setting pxa2x0_lcd_writethrough = 1 in a kernel binary.

Tested on WS003SH by me and on WS011SH by jun@, and console output speed
is improved ~three times faster than coherent (uncached) mapping.

XXX: should we have a flag like BUS_DMA_WRITETHROUGH in MI bus_dma(9)?

To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/sys/arch/arm/xscale/pxa2x0_lcd.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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