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| author | Yun Zhou <yun.zhou@windriver.com> | 2022-02-17 17:12:34 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-02-28 16:36:16 +0300 |
| commit | 6bb477df04366e0f69dd2f49e1ae1099069326bc (patch) | |
| tree | 20f6f83702e1a8ace0991f1e20f2a46946ebc913 /include | |
| parent | fcaaf76ed5f3bbf346db9e49d9d9c0978d8f8dce (diff) | |
| download | linux-6bb477df04366e0f69dd2f49e1ae1099069326bc.tar.xz | |
spi: use specific last_cs instead of last_cs_enable
Commit d40f0b6f2e21 instroduced last_cs_enable to avoid setting
chipselect if it's not necessary, but it also introduces a bug. The
chipselect may not be set correctly on multi-device SPI busses. The
reason is that we can't judge the chipselect by bool last_cs_enable,
since chipselect may be modified after other devices were accessed.
So we should record the specific state of chipselect in case of
confusion.
Signed-off-by: Yun Zhou <yun.zhou@windriver.com>
Link: https://lore.kernel.org/r/20220217141234.72737-1-yun.zhou@windriver.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/spi/spi.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 579d71cdf6fa..7d005fa4631c 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -370,7 +370,8 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch * @cur_msg_prepared: spi_prepare_message was called for the currently * in-flight message * @cur_msg_mapped: message has been mapped for DMA - * @last_cs_enable: was enable true on the last call to set_cs. + * @last_cs: the last chip_select that is recorded by set_cs, -1 on non chip + * selected * @last_cs_mode_high: was (mode & SPI_CS_HIGH) true on the last call to set_cs. * @xfer_completion: used by core transfer_one_message() * @busy: message pump is busy @@ -603,7 +604,7 @@ struct spi_controller { bool auto_runtime_pm; bool cur_msg_prepared; bool cur_msg_mapped; - bool last_cs_enable; + char last_cs; bool last_cs_mode_high; bool fallback; struct completion xfer_completion; |