linux-kernel - [PATCH 4.19 319/321] dmaengine: stm32-dma: check whether length is aligned on FIFO threshold

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Message-Id: <20191203223443.738270452@linuxfoundation.org>
Date:   Tue,  3 Dec 2019 23:36:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: [PATCH 4.19 319/321] dmaengine: stm32-dma: check whether length is aligned on FIFO threshold

From: Pierre-Yves MORDRET <pierre-yves.mordret@...com>

commit cc832dc8e32785a730ba07c3a357e17c201a5df8 upstream.

When a period length is not multiple of FIFO some data may be stuck
within FIFO.

Burst/FIFO Threshold/Period or buffer length check has to be hardened

In any case DMA will grant any request from client but will degraded
any parameters whether awkward.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/stm32-dma.c |   20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -308,20 +308,12 @@ static bool stm32_dma_fifo_threshold_is_
 
 static bool stm32_dma_is_burst_possible(u32 buf_len, u32 threshold)
 {
-	switch (threshold) {
-	case STM32_DMA_FIFO_THRESHOLD_FULL:
-		if (buf_len >= STM32_DMA_MAX_BURST)
-			return true;
-		else
-			return false;
-	case STM32_DMA_FIFO_THRESHOLD_HALFFULL:
-		if (buf_len >= STM32_DMA_MAX_BURST / 2)
-			return true;
-		else
-			return false;
-	default:
-		return false;
-	}
+	/*
+	 * Buffer or period length has to be aligned on FIFO depth.
+	 * Otherwise bytes may be stuck within FIFO at buffer or period
+	 * length.
+	 */
+	return ((buf_len % ((threshold + 1) * 4)) == 0);
 }
 
 static u32 stm32_dma_get_best_burst(u32 buf_len, u32 max_burst, u32 threshold,