| commit | 16215b928dae1bd3f92fdf4197af135ccb914c01 | [log] [tgz] |
|---|---|---|
| author | Eunchan Kim <eunchan@opentitan.org> | Mon May 02 15:49:15 2022 -0700 |
| committer | Eli Kim <github@elikim.dev> | Wed May 04 14:17:47 2022 -0700 |
| tree | 1a9369c57c7edbf1e0c7fc4fac8eef86d1ec11de | |
| parent | 0a2e246c2e321ba076f91448579d4e991ba4d267 [diff] |
[spi_device] Watermark and Flip handling
This commit revises the watermark logic to handle the corner case
correctly. The case is when `watermark` and `flip` both events occur at
the same cycle.
If both events happen at the same cycle, it means host system issues a
read request to the next buffer above the threshold.
For example, the threshold is configured to 0x83 (131 Byte) and the
current buffer is {1kB : 2kB}. Then when the host system issues read
request to 0x486 (1,158 byte), it triggers `flip` event and `watermark`
events.
Signed-off-by: Eunchan Kim <eunchan@opentitan.org>
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