From: Dmitry Osipenko <digetx@gmail.com>
To: Rajesh Gumasta <rgumasta@nvidia.com>,
ldewangan@nvidia.com, jonathanh@nvidia.com, vkoul@kernel.org,
dan.j.williams@intel.com, thierry.reding@gmail.com,
p.zabel@pengutronix.de, dmaengine@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: kyarlagadda@nvidia.com, Pavan Kunapuli <pkunapuli@nvidia.com>
Subject: Re: [Patch v2 2/4] dmaengine: tegra: Add Tegra GPC DMA driver
Date: Thu, 6 Aug 2020 16:46:14 +0300 [thread overview]
Message-ID: <bc7d0d9d-ac7f-b720-64f5-63e0c76e6786@gmail.com> (raw)
In-Reply-To: <1596699006-9934-3-git-send-email-rgumasta@nvidia.com>
06.08.2020 10:30, Rajesh Gumasta пишет:
...
> +/*
> + * Save and restore csr and channel register on pm_suspend
> + * and pm_resume respectively
> + */
> +static int __maybe_unused tegra_dma_pm_suspend(struct device *dev)
> +{
> + struct tegra_dma *tdma = dev_get_drvdata(dev);
> + int i;
> +
> + for (i = 0; i < tdma->chip_data->nr_channels; i++) {
> + struct tegra_dma_channel *tdc = &tdma->channels[i];
> + struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
> +
> + ch_reg->csr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSR);
> + ch_reg->src_ptr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR);
> + ch_reg->dst_ptr = tdc_read(tdc, TEGRA_GPCDMA_CHAN_DST_PTR);
> + ch_reg->high_addr_ptr = tdc_read(tdc,
> + TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR);
> + ch_reg->mc_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MCSEQ);
> + ch_reg->mmio_seq = tdc_read(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ);
> + ch_reg->wcount = tdc_read(tdc, TEGRA_GPCDMA_CHAN_WCOUNT);
> + }
> + return 0;
> +}
> +
> +static int __maybe_unused tegra_dma_pm_resume(struct device *dev)
> +{
> + struct tegra_dma *tdma = dev_get_drvdata(dev);
> + int i;
> +
> + for (i = 0; i < tdma->chip_data->nr_channels; i++) {
> + struct tegra_dma_channel *tdc = &tdma->channels[i];
> + struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
> +
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_WCOUNT, ch_reg->wcount);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_DST_PTR, ch_reg->dst_ptr);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_SRC_PTR, ch_reg->src_ptr);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_HIGH_ADDR_PTR,
> + ch_reg->high_addr_ptr);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_MMIOSEQ, ch_reg->mmio_seq);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_MCSEQ, ch_reg->mc_seq);
> + tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSR,
> + (ch_reg->csr & ~TEGRA_GPCDMA_CSR_ENB));
> + }
> + return 0;
> +}
> +
> +static const struct __maybe_unused dev_pm_ops tegra_dma_dev_pm_ops = {
> + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
> +};
Please explain why this is needed. All DMA should be stopped (not
paused) on system's suspend, shouldn't it?
next prev parent reply other threads:[~2020-08-06 17:24 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-06 7:30 [Patch v2 0/4] Add Nvidia Tegra GPC-DMA driver Rajesh Gumasta
2020-08-06 7:30 ` [Patch v2 1/4] dt-bindings: dma: Add DT binding document Rajesh Gumasta
2020-08-06 7:30 ` [Patch v2 2/4] dmaengine: tegra: Add Tegra GPC DMA driver Rajesh Gumasta
2020-08-06 13:46 ` Dmitry Osipenko [this message]
2020-08-06 13:56 ` Rajesh Gumasta
2020-08-06 14:22 ` Dmitry Osipenko
2020-08-06 14:49 ` Dmitry Osipenko
2020-08-06 15:02 ` Dmitry Osipenko
2020-08-07 16:03 ` Jon Hunter
2020-08-07 16:23 ` Jon Hunter
2020-08-06 7:30 ` [Patch v2 3/4] arm64: configs: enable tegra gpc dma Rajesh Gumasta
2020-08-06 7:30 ` [Patch v2 4/4] arm64: tegra: Add GPCDMA node in dt Rajesh Gumasta
2020-08-07 16:26 ` Jon Hunter
2021-01-14 10:11 ` [Patch v2 0/4] Add Nvidia Tegra GPC-DMA driver Jon Hunter
2021-01-15 5:56 ` Vinod Koul
2021-01-15 13:21 ` Jon Hunter
2021-01-15 13:42 ` Rajesh Gumasta
2021-08-27 6:04 ` [PATCH v3 " Akhil R
2021-08-27 6:04 ` [PATCH v3 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-02 10:42 ` Jon Hunter
2021-08-27 6:04 ` [PATCH v3 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
2021-08-27 17:23 ` kernel test robot
2021-08-28 11:29 ` kernel test robot
2021-09-01 20:56 ` Jon Hunter
2021-09-02 10:57 ` Jon Hunter
2021-09-02 10:17 ` Jon Hunter
2021-08-27 6:04 ` [PATCH v3 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
2021-09-02 11:35 ` Jon Hunter
2021-08-27 6:04 ` [PATCH v3 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
2021-09-02 10:36 ` Jon Hunter
2021-09-08 14:32 ` [PATCH v4 0/4] Add Nvidia Tegra GPC-DMA driver Akhil R
2021-09-08 14:32 ` [PATCH v4 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-08 16:44 ` Jon Hunter
2021-09-15 8:08 ` Akhil R
2021-09-08 14:32 ` [PATCH v4 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
2021-09-08 14:32 ` [PATCH v4 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
2021-09-08 14:32 ` [PATCH v4 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
2021-09-08 16:45 ` Jon Hunter
2021-09-08 16:44 ` [PATCH v4 0/4] Add Nvidia Tegra GPC-DMA driver Jon Hunter
2021-09-13 4:08 ` Akhil R
2021-09-16 12:18 ` [PATCH v5 " Akhil R
2021-09-16 12:18 ` [PATCH v5 1/4] dt-bindings: dmaengine: Add doc for tegra gpcdma Akhil R
2021-09-16 14:30 ` Jon Hunter
2021-09-16 12:18 ` [PATCH v5 2/4] dmaengine: tegra: Add tegra gpcdma driver Akhil R
2021-09-16 12:18 ` [PATCH v5 3/4] arm64: defconfig: tegra: Enable GPCDMA Akhil R
2021-09-16 12:18 ` [PATCH v5 4/4] arm64: tegra: Add GPCDMA node for tegra186 and tegra194 Akhil R
2021-09-16 14:33 ` Jon Hunter
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