linux-kernel - [PATCH] dmaengine: ti: k3-udma: Update rchan_oes

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Date:   Mon, 31 Aug 2020 12:10:19 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <dan.j.williams@...el.com>,
        <linux-kernel@...r.kernel.org>, <lokeshvutla@...com>, <nm@...com>
Subject: [PATCH] dmaengine: ti: k3-udma: Update rchan_oes_offset for am654 SYSFW ABI 3.0

SYSFW ABI 3.0 has changed the rchan_oes_offset value for am654 to support
SR2.

Since the kernel now needs SYSFW API 3.0 to work because the merged irqchip
update, we need to also update the am654 rchan_oes_offset.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
Hi Vinod,

A series from Lokesh to support sysfw ABI 3.0 and newer is now in mainline
under v5.9-rc3 tag.
With his series Linux can not really boot into a usable state with older sysfw
and the ABI 3.0 have additional changes affecting UDMA on am654:
the rchan_oes_offset number is changed to better align with j72xx and to be able
to support both SR1 and SR2 of am654.

Can you send this patch for -rc4 to fix the regression now in mainline?
The regression is that one can not request TR mode channel to service a
peripheral.

We do not have users upstream depending on this, but I do have out of tree audio
support and cutomers might pick up 5.9 from mainline when it is released.

Thank you,
Peter

 drivers/dma/ti/k3-udma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 989998b6e078..9a7048bcf0f1 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -3091,14 +3091,14 @@ static struct udma_match_data am654_main_data = {
 	.psil_base = 0x1000,
 	.enable_memcpy_support = true,
 	.statictr_z_mask = GENMASK(11, 0),
-	.rchan_oes_offset = 0x2000,
+	.rchan_oes_offset = 0x200,
 };

 static struct udma_match_data am654_mcu_data = {
 	.psil_base = 0x6000,
 	.enable_memcpy_support = false,
 	.statictr_z_mask = GENMASK(11, 0),
-	.rchan_oes_offset = 0x2000,
+	.rchan_oes_offset = 0x200,
 };

 static struct udma_match_data j721e_main_data = {
-- 
Peter

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