[PATCH v2] spi: spi-mtk-nor: fix timeout calculation overflow
broonie at kernel.org
Fri Sep 25 16:42:13 EDT 2020
On Tue, 22 Sep 2020 19:49:02 +0800, Chuanhong Guo wrote:
> CLK_TO_US macro is used to calculate potential transfer time for various
> timeout handling. However it overflows on transfer bigger than 512 bytes
> because it first did (len * 8 * 1000000).
> This controller typically operates at 45MHz. This patch did 2 things:
> 1. calculate clock / 1000000 first
> 2. add a 4M transfer size cap so that the final timeout in DMA reading
> doesn't overflow
[1/1] spi: spi-mtk-nor: fix timeout calculation overflow
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