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Message-ID: <alpine.DEB.2.21.2211161811170.54611@angie.orcam.me.uk>
Date: Wed, 16 Nov 2022 21:36:09 +0000 (GMT)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Sudip Mukherjee <sudipm.mukherjee@...il.com>
cc: linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] parport_pc: Add an ECR mask field for PCI devices
Add a bitmask field specifying writable ECR bits for PCI devices and
apply it via `__parport_pc_probe_port'.
Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
---
drivers/parport/parport_pc.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
linux-parport-pc-pci-ecr-write.diff
Index: linux-macro/drivers/parport/parport_pc.c
===================================================================
--- linux-macro.orig/drivers/parport/parport_pc.c
+++ linux-macro/drivers/parport/parport_pc.c
@@ -2662,6 +2662,10 @@ static struct parport_pc_pci {
/* Bit field of parport modes to exclude. */
unsigned int mode_mask;
+ /* If non-zero, sets the bitmask of writable ECR bits. In that
+ * case additionally bit 0 will be forcibly set on writes. */
+ unsigned char ecr_writable;
+
/* If set, this is called immediately after pci_enable_device.
* If it returns non-zero, no probing will take place and the
* ports will not be used. */
@@ -2868,7 +2872,8 @@ static int parport_pc_pci_probe(struct p
__parport_pc_probe_port(io_lo, io_hi, irq,
PARPORT_DMA_NONE, &dev->dev,
IRQF_SHARED,
- cards[i].mode_mask, 0);
+ cards[i].mode_mask,
+ cards[i].ecr_writable);
if (data->ports[count])
count++;
}
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