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dmaengine: tegra210-adma: Don't program FIFO threshold 

The Tegra210 ADMA supports two modes for transferring data to a FIFO
which are ...

1. Transfer data to/from the FIFO as soon as a single burst can be
   transferred.
2. Transfer data to/from the FIFO based upon FIFO thresholds, where
   the FIFO threshold is specified in terms on multiple bursts.

Currently, the ADMA driver programs the FIFO threshold values in the
FIFO_CTRL register, but never enables the transfer mode that uses
these threshold values. Given that these have never been used so far,
simplify the ADMA driver by removing the programming of these threshold
values.

Signed-off-by: Jonathan Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20190731101639.22755-1-jonathanh@nvidia.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Jonathan Hunter 2019-07-31 11:16:39 +01:00 committed by Vinod Koul
parent 57dbd0e4b9
commit a9afc9ea93
1 changed files with 2 additions and 10 deletions
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12
drivers/dma/tegra210-adma.c
View File

@ -42,12 +42,8 @@
#define ADMA_CH_CONFIG_MAX_BUFS 8
#define ADMA_CH_FIFO_CTRL 0x2c
#define TEGRA210_ADMA_CH_FIFO_CTRL_OFLWTHRES(val) (((val) & 0xf) << 24)
#define TEGRA210_ADMA_CH_FIFO_CTRL_STRVTHRES(val) (((val) & 0xf) << 16)
#define TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0xf) << 8)
#define TEGRA210_ADMA_CH_FIFO_CTRL_RXSIZE(val) ((val) & 0xf)
#define TEGRA186_ADMA_CH_FIFO_CTRL_OFLWTHRES(val) (((val) & 0x1f) << 24)
#define TEGRA186_ADMA_CH_FIFO_CTRL_STRVTHRES(val) (((val) & 0x1f) << 16)
#define TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(val) (((val) & 0x1f) << 8)
#define TEGRA186_ADMA_CH_FIFO_CTRL_RXSIZE(val) ((val) & 0x1f)
@ -64,14 +60,10 @@
#define TEGRA_ADMA_BURST_COMPLETE_TIME 20
#define TEGRA210_FIFO_CTRL_DEFAULT (TEGRA210_ADMA_CH_FIFO_CTRL_OFLWTHRES(1) | \
TEGRA210_ADMA_CH_FIFO_CTRL_STRVTHRES(1) | \
TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \
#define TEGRA210_FIFO_CTRL_DEFAULT (TEGRA210_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \
TEGRA210_ADMA_CH_FIFO_CTRL_RXSIZE(3))
#define TEGRA186_FIFO_CTRL_DEFAULT (TEGRA186_ADMA_CH_FIFO_CTRL_OFLWTHRES(1) | \
TEGRA186_ADMA_CH_FIFO_CTRL_STRVTHRES(1) | \
TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \
#define TEGRA186_FIFO_CTRL_DEFAULT (TEGRA186_ADMA_CH_FIFO_CTRL_TXSIZE(3) | \
TEGRA186_ADMA_CH_FIFO_CTRL_RXSIZE(3))
#define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift)