tmakin/ack-tegra
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

8250: microchip: pci1xxxx: Add PCIe Hot reset disable support for Rev C0 and later devices

Browse Source 
[ Upstream commit c40b91e38eb8d4489def095d62ab476d45871323 ]

Systems that issue PCIe hot reset requests during a suspend/resume
cycle cause PCI1XXXX device revisions prior to C0 to get its UART
configuration registers reset to hardware default values. This results
in device inaccessibility and data transfer failures. Starting with
Revision C0, support was added in the device hardware (via the Hot
Reset Disable Bit) to allow resetting only the PCIe interface and its
associated logic, but preserving the UART configuration during a hot
reset. This patch enables the hot reset disable feature during suspend/
resume for C0 and later revisions of the device.

Signed-off-by: Rengarajan S <rengarajan.s@microchip.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250425145500.29036-1-rengarajan.s@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rengarajan S
2025-04-25 20:25:00 +05:30
committed by Greg Kroah-Hartman
parent cf6d532de4
commit a0baf4d78b
1 changed files with 10 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/tty/serial/8250/8250_pci1xxxx.c
View File

@@ -115,6 +115,7 @@
#define UART_RESET_REG 0x94
#define UART_RESET_D3_RESET_DISABLE BIT(16)
#define UART_RESET_HOT_RESET_DISABLE BIT(17)
#define UART_BURST_STATUS_REG 0x9C
#define UART_TX_BURST_FIFO 0xA0
@@ -620,6 +621,10 @@ static int pci1xxxx_suspend(struct device *dev)
}
data = readl(p + UART_RESET_REG);
if (priv->dev_rev >= 0xC0)
data |= UART_RESET_HOT_RESET_DISABLE;
writel(data | UART_RESET_D3_RESET_DISABLE, p + UART_RESET_REG);
if (wakeup)
@@ -647,7 +652,12 @@ static int pci1xxxx_resume(struct device *dev)
}
data = readl(p + UART_RESET_REG);
if (priv->dev_rev >= 0xC0)
data &= ~UART_RESET_HOT_RESET_DISABLE;
writel(data & ~UART_RESET_D3_RESET_DISABLE, p + UART_RESET_REG);
iounmap(p);
for (i = 0; i < priv->nr; i++) {