linux-kernel - [PATCH 4.14 087/183] spi: pxa2xx: Setup maximum supported DMA transfer length

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Message-Id: <20190322111248.051861889@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:15:15 +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,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.14 087/183] spi: pxa2xx: Setup maximum supported DMA transfer length

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

commit ef070b4e4aa25bb5f8632ad196644026c11903bf upstream.

When the commit b6ced294fb61

   ("spi: pxa2xx: Switch to SPI core DMA mapping functionality")

switches to SPI core provided DMA helpers, it missed to setup maximum
supported DMA transfer length for the controller and thus users
mistakenly try to send more data than supported with the following
warning:

  ili9341 spi-PRP0001:01: DMA disabled for transfer length 153600 greater than 65536

Setup maximum supported DMA transfer length in order to make users know
the limit.

Fixes: b6ced294fb61 ("spi: pxa2xx: Switch to SPI core DMA mapping functionality")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-pxa2xx.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1698,6 +1698,7 @@ static int pxa2xx_spi_probe(struct platf
 			platform_info->enable_dma = false;
 		} else {
 			master->can_dma = pxa2xx_spi_can_dma;
+			master->max_dma_len = MAX_DMA_LEN;
 		}
 	}