6.6-stable review patch. If anyone has any objections, please let me know.
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From: Akhil R akhilrajeev@nvidia.com
commit ebc008699fd95701c9af5ebaeb0793eef81a71d5 upstream.
Currently, the driver does not return the correct DMA status when a DMA pause is issued by the client drivers. This causes GPCDMA users to assume that DMA is still running, while in reality, the DMA is paused.
Return DMA_PAUSED for tx_status() if the channel is paused in the middle of a transfer.
Fixes: ee17028009d4 ("dmaengine: tegra: Add tegra gpcdma driver") Cc: stable@vger.kernel.org Signed-off-by: Akhil R akhilrajeev@nvidia.com Signed-off-by: Kartik Rajput kkartik@nvidia.com Link: https://lore.kernel.org/r/20241212124412.5650-1-kkartik@nvidia.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dma/tegra186-gpc-dma.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
--- a/drivers/dma/tegra186-gpc-dma.c +++ b/drivers/dma/tegra186-gpc-dma.c @@ -231,6 +231,7 @@ struct tegra_dma_channel { bool config_init; char name[30]; enum dma_transfer_direction sid_dir; + enum dma_status status; int id; int irq; int slave_id; @@ -393,6 +394,8 @@ static int tegra_dma_pause(struct tegra_ tegra_dma_dump_chan_regs(tdc); }
+ tdc->status = DMA_PAUSED; + return ret; }
@@ -419,6 +422,8 @@ static void tegra_dma_resume(struct tegr val = tdc_read(tdc, TEGRA_GPCDMA_CHAN_CSRE); val &= ~TEGRA_GPCDMA_CHAN_CSRE_PAUSE; tdc_write(tdc, TEGRA_GPCDMA_CHAN_CSRE, val); + + tdc->status = DMA_IN_PROGRESS; }
static int tegra_dma_device_resume(struct dma_chan *dc) @@ -544,6 +549,7 @@ static void tegra_dma_xfer_complete(stru
tegra_dma_sid_free(tdc); tdc->dma_desc = NULL; + tdc->status = DMA_COMPLETE; }
static void tegra_dma_chan_decode_error(struct tegra_dma_channel *tdc, @@ -716,6 +722,7 @@ static int tegra_dma_terminate_all(struc tdc->dma_desc = NULL; }
+ tdc->status = DMA_COMPLETE; tegra_dma_sid_free(tdc); vchan_get_all_descriptors(&tdc->vc, &head); spin_unlock_irqrestore(&tdc->vc.lock, flags); @@ -769,6 +776,9 @@ static enum dma_status tegra_dma_tx_stat if (ret == DMA_COMPLETE) return ret;
+ if (tdc->status == DMA_PAUSED) + ret = DMA_PAUSED; + spin_lock_irqsave(&tdc->vc.lock, flags); vd = vchan_find_desc(&tdc->vc, cookie); if (vd) {