6.4-stable review patch. If anyone has any objections, please let me know.
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From: Eddie James eajames@linux.ibm.com
[ Upstream commit 52300909f4670ac552bfeb33c1355b896eac8c06 ]
It has been observed that sometimes the FSI master will return all 0xffs after a CFAM has been taken out of reset, without presenting any error. Resetting the FSI master errors resolves the issue.
Fixes: 4a851d714ead ("fsi: aspeed: Support CFAM reset GPIO") Signed-off-by: Eddie James eajames@linux.ibm.com Link: https://lore.kernel.org/r/20230612195657.245125-8-eajames@linux.ibm.com Signed-off-by: Joel Stanley joel@jms.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/fsi/fsi-master-aspeed.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c index 7cec1772820d3..5eccab175e86b 100644 --- a/drivers/fsi/fsi-master-aspeed.c +++ b/drivers/fsi/fsi-master-aspeed.c @@ -454,6 +454,8 @@ static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *att gpiod_set_value(aspeed->cfam_reset_gpio, 1); usleep_range(900, 1000); gpiod_set_value(aspeed->cfam_reset_gpio, 0); + usleep_range(900, 1000); + opb_writel(aspeed, ctrl_base + FSI_MRESP0, cpu_to_be32(FSI_MRESP_RST_ALL_MASTER)); mutex_unlock(&aspeed->lock); trace_fsi_master_aspeed_cfam_reset(false);