mirror of
https://gitlab.alpinelinux.org/alpine/aports.git
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68 lines
2.4 KiB
Diff
68 lines
2.4 KiB
Diff
https://bugs.alpinelinux.org/issues/4973
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https://github.com/raspberrypi/linux/issues/911
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https://github.com/raspberrypi/linux/pull/1135
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https://github.com/msperl/linux-rpi/commit/aef50a19f335ae3d2eb43ac5496c7f03930b394f
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This is not a proper fix, but as this is rasperry pi specific kernel,
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we've applied this workaround for now.
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From aef50a19f335ae3d2eb43ac5496c7f03930b394f Mon Sep 17 00:00:00 2001
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From: Martin Sperl <kernel@martin.sperl.org>
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Date: Tue, 15 Sep 2015 07:26:07 +0000
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Subject: [PATCH] mmc: spi: disable dma mapping code, as it does not work
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since:
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commit 0589342c27944e50ebd7a54f5215002b6598b748
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Author: Rob Herring <rob.herring@calxeda.com>
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Date: Tue Oct 29 23:36:46 2013 -0500
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of: set dma_mask to point to coherent_dma_mask
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Platform devices created by DT code don't initialize dma_mask pointer to
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anything. Set it to coherent_dma_mask by default if the architecture
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code has not set it.
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the mmc-spi driver no longer detects the sd-cards any longer.
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This patch disables the offending section in mmc_spi
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so that the driver works again and detects the sd card normally.
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There is no real negative impact as the spi-framework
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does no longer rely on driver-provided DMA mappings but
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maps the transfers transparently.
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Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
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---
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drivers/mmc/host/mmc_spi.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
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index ae19d83..16946e2 100644
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--- a/drivers/mmc/host/mmc_spi.c
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+++ b/drivers/mmc/host/mmc_spi.c
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@@ -1387,6 +1387,16 @@ static int mmc_spi_probe(struct spi_device *spi)
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if (!host->data)
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goto fail_nobuf1;
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+ /* for some reason mmc_spi does not work with this enabled
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+ * it is not needed anyway, as the SPI framework does DMA
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+ * transfers now automatically
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+ * the patch that introduced this was:
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+ * commit 0589342c27944e50ebd7a54f5215002b6598b748
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+ * Author: Rob Herring <rob.herring@calxeda.com>
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+ * Date: Tue Oct 29 23:36:46 2013 -0500
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+ * of: set dma_mask to point to coherent_dma_mask
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+ */
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+#if 0
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if (spi->master->dev.parent->dma_mask) {
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struct device *dev = spi->master->dev.parent;
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@@ -1402,6 +1412,7 @@ static int mmc_spi_probe(struct spi_device *spi)
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host->data_dma, sizeof(*host->data),
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DMA_BIDIRECTIONAL);
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}
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+#endif
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/* setup message for status/busy readback */
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spi_message_init(&host->readback);
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