mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-26 02:39:48 +00:00
Code Issues Releases Wiki Activity

thunderbolt: Use 32-bit writes when writing ring producer/consumer

Browse source 
[ Upstream commit 943795219d ]

The register access should be using 32-bit reads/writes according to the
datasheet. With the previous generation hardware 16-bit writes have been
working but starting with ICL this is not the case anymore so fix
producer/consumer register update to use correct width register address.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Tested-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mika Westerberg 2018-07-04 08:46:07 +03:00 committed by Greg Kroah-Hartman
parent 54b9f57918
commit 56ab84408d
1 changed files with 18 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
drivers/thunderbolt/nhi.c
View file

@ -134,9 +134,20 @@ static void __iomem *ring_options_base(struct tb_ring *ring)
return io;
}
static void ring_iowrite16desc(struct tb_ring *ring, u32 value, u32 offset)
static void ring_iowrite_cons(struct tb_ring *ring, u16 cons)
{
iowrite16(value, ring_desc_base(ring) + offset);
/*
* The other 16-bits in the register is read-only and writes to it
* are ignored by the hardware so we can save one ioread32() by
* filling the read-only bits with zeroes.
*/
iowrite32(cons, ring_desc_base(ring) + 8);
}
static void ring_iowrite_prod(struct tb_ring *ring, u16 prod)
{
/* See ring_iowrite_cons() above for explanation */
iowrite32(prod << 16, ring_desc_base(ring) + 8);
}
static void ring_iowrite32desc(struct tb_ring *ring, u32 value, u32 offset)
@ -188,7 +199,10 @@ static void ring_write_descriptors(struct tb_ring *ring)
descriptor->sof = frame->sof;
}
ring->head = (ring->head + 1) % ring->size;
ring_iowrite16desc(ring, ring->head, ring->is_tx ? 10 : 8);
if (ring->is_tx)
ring_iowrite_prod(ring, ring->head);
else
ring_iowrite_cons(ring, ring->head);
}
}
@ -461,7 +475,7 @@ void ring_stop(struct tb_ring *ring)
ring_iowrite32options(ring, 0, 0);
ring_iowrite64desc(ring, 0, 0);
ring_iowrite16desc(ring, 0, ring->is_tx ? 10 : 8);
ring_iowrite32desc(ring, 0, 8);
ring_iowrite32desc(ring, 0, 12);
ring->head = 0;
ring->tail = 0;