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fpga: dfl: afu: harden port enable logic

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Port enable is not complete until ACK = 0. Change
__afu_port_enable() to guarantee that the enable process
is complete by polling for ACK == 0.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Acked-by: Wu Hao <hao.wu@intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
This commit is contained in:
Russ Weight 2021-03-23 15:46:50 -07:00 committed by Moritz Fischer
parent 6f1e376cfc
commit 9a8d3cda8d
3 changed files with 31 additions and 16 deletions
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10
drivers/fpga/dfl-afu-error.c
View File

@ -52,7 +52,7 @@ static int afu_port_err_clear(struct device *dev, u64 err)
struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
struct platform_device *pdev = to_platform_device(dev);
void __iomem *base_err, *base_hdr;
int ret = -EBUSY;
int enable_ret = 0, ret = -EBUSY;
u64 v;
base_err = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
@ -96,18 +96,20 @@ static int afu_port_err_clear(struct device *dev, u64 err)
v = readq(base_err + PORT_FIRST_ERROR);
writeq(v, base_err + PORT_FIRST_ERROR);
} else {
dev_warn(dev, "%s: received 0x%llx, expected 0x%llx\n",
__func__, v, err);
ret = -EINVAL;
}
/* Clear mask */
__afu_port_err_mask(dev, false);
/* Enable the Port by clear the reset */
__afu_port_enable(pdev);
/* Enable the Port by clearing the reset */
enable_ret = __afu_port_enable(pdev);
done:
mutex_unlock(&pdata->lock);
return ret;
return enable_ret ? enable_ret : ret;
}
static ssize_t errors_show(struct device *dev, struct device_attribute *attr,

35
drivers/fpga/dfl-afu-main.c
View File

@ -21,6 +21,9 @@
#include "dfl-afu.h"
#define RST_POLL_INVL 10 /* us */
#define RST_POLL_TIMEOUT 1000 /* us */
/**
* __afu_port_enable - enable a port by clear reset
* @pdev: port platform device.
@ -32,7 +35,7 @@
*
* The caller needs to hold lock for protection.
*/
void __afu_port_enable(struct platform_device *pdev)
int __afu_port_enable(struct platform_device *pdev)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
void __iomem *base;
@ -41,7 +44,7 @@ void __afu_port_enable(struct platform_device *pdev)
WARN_ON(!pdata->disable_count);
if (--pdata->disable_count != 0)
return;
return 0;
base = dfl_get_feature_ioaddr_by_id(&pdev->dev, PORT_FEATURE_ID_HEADER);
@ -49,10 +52,20 @@ void __afu_port_enable(struct platform_device *pdev)
v = readq(base + PORT_HDR_CTRL);
v &= ~PORT_CTRL_SFTRST;
writeq(v, base + PORT_HDR_CTRL);
}
#define RST_POLL_INVL 10 /* us */
#define RST_POLL_TIMEOUT 1000 /* us */
/*
* HW clears the ack bit to indicate that the port is fully out
* of reset.
*/
if (readq_poll_timeout(base + PORT_HDR_CTRL, v,
!(v & PORT_CTRL_SFTRST_ACK),
RST_POLL_INVL, RST_POLL_TIMEOUT)) {
dev_err(&pdev->dev, "timeout, failure to enable device\n");
return -ETIMEDOUT;
}
return 0;
}
/**
* __afu_port_disable - disable a port by hold reset
@ -86,7 +99,7 @@ int __afu_port_disable(struct platform_device *pdev)
if (readq_poll_timeout(base + PORT_HDR_CTRL, v,
v & PORT_CTRL_SFTRST_ACK,
RST_POLL_INVL, RST_POLL_TIMEOUT)) {
dev_err(&pdev->dev, "timeout, fail to reset device\n");
dev_err(&pdev->dev, "timeout, failure to disable device\n");
return -ETIMEDOUT;
}
@ -110,10 +123,10 @@ static int __port_reset(struct platform_device *pdev)
int ret;
ret = __afu_port_disable(pdev);
if (!ret)
__afu_port_enable(pdev);
if (ret)
return ret;
return ret;
return __afu_port_enable(pdev);
}
static int port_reset(struct platform_device *pdev)
@ -872,11 +885,11 @@ static int afu_dev_destroy(struct platform_device *pdev)
static int port_enable_set(struct platform_device *pdev, bool enable)
{
struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
int ret = 0;
int ret;
mutex_lock(&pdata->lock);
if (enable)
__afu_port_enable(pdev);
ret = __afu_port_enable(pdev);
else
ret = __afu_port_disable(pdev);
mutex_unlock(&pdata->lock);

2
drivers/fpga/dfl-afu.h
View File

@ -80,7 +80,7 @@ struct dfl_afu {
};
/* hold pdata->lock when call __afu_port_enable/disable */
void __afu_port_enable(struct platform_device *pdev);
int __afu_port_enable(struct platform_device *pdev);
int __afu_port_disable(struct platform_device *pdev);
void afu_mmio_region_init(struct dfl_feature_platform_data *pdata);