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52c17bff3c
This adds kernel support for the Pistachio SoC and the Marduk (Ci40) board which uses it. Much of the code for Pistachio has been upstreamed however some patches are still required to boot from the Marduk board: * spi bug fixes * dma bug fixes * pistachio internal clock tree bug fixes * spi-nand implementation * dts based mtd device naming scheme * dts backports and bug fixes Signed-off-by: Abhijit Mahajani <Abhijit.Mahajani@imgtec.com> Signed-off-by: Francois Berder <francois.berder@imgtec.com> Signed-off-by: Ian Pozella <Ian.Pozella@imgtec.com>
74 lines
2.1 KiB
Diff
74 lines
2.1 KiB
Diff
From a2dd154377c9aa6ddda00d39b8c7c334e4fa16ff Mon Sep 17 00:00:00 2001
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From: Damien Horsley <damien.horsley@imgtec.com>
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Date: Tue, 22 Mar 2016 12:46:09 +0000
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Subject: dmaengine: img-mdc: Handle early status read
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It is possible that mdc_tx_status may be called before the first
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node has been read from memory.
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In this case, the residue value stored in the register is undefined.
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Return the transfer size instead.
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Signed-off-by: Damien Horsley <damien.horsley@imgtec.com>
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---
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drivers/dma/img-mdc-dma.c | 40 ++++++++++++++++++++++++----------------
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1 file changed, 24 insertions(+), 16 deletions(-)
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diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c
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index 624f1e1..0216e2c 100644
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--- a/drivers/dma/img-mdc-dma.c
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+++ b/drivers/dma/img-mdc-dma.c
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@@ -623,25 +623,33 @@ static enum dma_status mdc_tx_status(struct dma_chan *chan,
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(MDC_CMDS_PROCESSED_CMDS_DONE_MASK + 1);
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/*
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- * If the command loaded event hasn't been processed yet, then
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- * the difference above includes an extra command.
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+ * If the first node has not yet been read from memory,
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+ * the residue register value is undefined
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*/
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- if (!mdesc->cmd_loaded)
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- cmds--;
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- else
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- cmds += mdesc->list_cmds_done;
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-
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- bytes = mdesc->list_xfer_size;
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- ldesc = mdesc->list;
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- for (i = 0; i < cmds; i++) {
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- bytes -= ldesc->xfer_size + 1;
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- ldesc = ldesc->next_desc;
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- }
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- if (ldesc) {
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- if (residue != MDC_TRANSFER_SIZE_MASK)
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- bytes -= ldesc->xfer_size - residue;
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+ if (!mdesc->cmd_loaded && !cmds) {
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+ bytes = mdesc->list_xfer_size;
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+ } else {
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+ /*
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+ * If the command loaded event hasn't been processed yet, then
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+ * the difference above includes an extra command.
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+ */
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+ if (!mdesc->cmd_loaded)
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+ cmds--;
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else
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+ cmds += mdesc->list_cmds_done;
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+
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+ bytes = mdesc->list_xfer_size;
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+ ldesc = mdesc->list;
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+ for (i = 0; i < cmds; i++) {
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bytes -= ldesc->xfer_size + 1;
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+ ldesc = ldesc->next_desc;
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+ }
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+ if (ldesc) {
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+ if (residue != MDC_TRANSFER_SIZE_MASK)
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+ bytes -= ldesc->xfer_size - residue;
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+ else
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+ bytes -= ldesc->xfer_size + 1;
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+ }
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}
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}
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spin_unlock_irqrestore(&mchan->vc.lock, flags);
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--
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2.7.4
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