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| author | Dmitry Osipenko <digetx@gmail.com> | 2021-01-20 02:52:10 +0300 |
|---|---|---|
| committer | Krzysztof Kozlowski <krzk@kernel.org> | 2021-01-23 02:10:40 +0300 |
| commit | 6ce84ab6492c8634039267d1d9e89fe41dcd4770 (patch) | |
| tree | 6b9fc5e2e72345a79e4fa84e113a04413f667fac /drivers/memory/tegra/mc.c | |
| parent | 380def2d4cf257663de42618e57134afeded32dd (diff) | |
| download | linux-6ce84ab6492c8634039267d1d9e89fe41dcd4770.tar.xz | |
memory: tegra: Check whether reset is already asserted
Check whether memory client reset is already asserted in order to prevent
DMA-flush error on trying to re-assert an already asserted reset.
This becomes a problem once PMC GENPD is enabled to use memory resets
since GENPD will get a error and fail to toggle power domain. PMC GENPDs
can't be toggled safely without holding memory reset on Tegra and we're
about to fix this.
Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Nicolas Chauvet <kwizart@gmail.com> # PAZ00 T20
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20210119235210.13006-1-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Diffstat (limited to 'drivers/memory/tegra/mc.c')
| -rw-r--r-- | drivers/memory/tegra/mc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c index 44064de962c2..a21163ccadc4 100644 --- a/drivers/memory/tegra/mc.c +++ b/drivers/memory/tegra/mc.c @@ -176,6 +176,13 @@ static int tegra_mc_hotreset_assert(struct reset_controller_dev *rcdev, if (!rst_ops) return -ENODEV; + /* DMA flushing will fail if reset is already asserted */ + if (rst_ops->reset_status) { + /* check whether reset is asserted */ + if (rst_ops->reset_status(mc, rst)) + return 0; + } + if (rst_ops->block_dma) { /* block clients DMA requests */ err = rst_ops->block_dma(mc, rst); |