From: Mika Westerberg mika.westerberg@linux.intel.com
[ Upstream commit 943795219d3cb9f8ce6ce51cad3ffe1f61e95c6b ]
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 --- drivers/thunderbolt/nhi.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index 6713fd1958e73..3a39d7d0175ab 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -94,9 +94,20 @@ 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) @@ -148,7 +159,10 @@ 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); } }
@@ -368,7 +382,7 @@ 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;