net: dwc: Make the cache handling less cryptic
Add a few new variables to make the cache handling less cryptic. Add a variable for DMA and DATA descriptor start and end, so the correctness of the code is easier to inspect. Signed-off-by: NMarek Vasut <marex@denx.de> Cc: Chin Liang See <clsee@altera.com> Cc: Dinh Nguyen <dinguyen@altera.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Cc: Tom Rini <trini@ti.com> Cc: Wolfgang Denk <wd@denx.de> Cc: Pavel Machek <pavel@denx.de> Cc: Joe Hershberger <joe.hershberger@gmail.com> Acked-by: NPavel Machek <pavel@denx.de> Acked-by: NChin Liang See <clsee@altera.com>
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