From bacdcb6675e170bb2e8d3824da220e10274f42a7 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Wed, 23 Oct 2019 08:31:38 -0700
Subject: [PATCH] dmaengine: cppi41: Fix cppi41_dma_prep_slave_sg() when idle
Git-commit: bacdcb6675e170bb2e8d3824da220e10274f42a7
Patch-mainline: v5.4-rc6
References: git-fixes bnc#1151927 5.3.9
Yegor Yefremov <yegorslists@googlemail.com> reported that musb and ftdi
uart can fail for the first open of the uart unless connected using
a hub.
This is because the first dma call done by musb_ep_program() must wait
if cppi41 is PM runtime suspended. Otherwise musb_ep_program() continues
with other non-dma packets before the DMA transfer is started causing at
least ftdi uarts to fail to receive data.
Let's fix the issue by waking up cppi41 with PM runtime calls added to
cppi41_dma_prep_slave_sg() and return NULL if still idled. This way we
have musb_ep_program() continue with PIO until cppi41 is awake.
Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support")
Reported-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Cc: stable@vger.kernel.org # v4.9+
Link: https://lore.kernel.org/r/20191023153138.23442-1-tony@atomide.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/dma/ti/cppi41.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/ti/cppi41.c b/drivers/dma/ti/cppi41.c
index 2f946f55076c..8c2f7ebe998c 100644
--- a/drivers/dma/ti/cppi41.c
+++ b/drivers/dma/ti/cppi41.c
@@ -586,9 +586,22 @@ static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg(
enum dma_transfer_direction dir, unsigned long tx_flags, void *context)
{
struct cppi41_channel *c = to_cpp41_chan(chan);
+ struct dma_async_tx_descriptor *txd = NULL;
+ struct cppi41_dd *cdd = c->cdd;
struct cppi41_desc *d;
struct scatterlist *sg;
unsigned int i;
+ int error;
+
+ error = pm_runtime_get(cdd->ddev.dev);
+ if (error < 0) {
+ pm_runtime_put_noidle(cdd->ddev.dev);
+
+ return NULL;
+ }
+
+ if (cdd->is_suspended)
+ goto err_out_not_ready;
d = c->desc;
for_each_sg(sgl, sg, sg_len, i) {
@@ -611,7 +624,13 @@ static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg(
d++;
}
- return &c->txd;
+ txd = &c->txd;
+
+err_out_not_ready:
+ pm_runtime_mark_last_busy(cdd->ddev.dev);
+ pm_runtime_put_autosuspend(cdd->ddev.dev);
+
+ return txd;
}
static void cppi41_compute_td_desc(struct cppi41_desc *d)
--
2.16.4