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Signed-off-by: Akhil R --- .../devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml index 9dd1476d1849..81f3badbc8ec 100644 --- a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml @@ -23,6 +23,7 @@ properties: oneOf: - const: nvidia,tegra186-gpcdma - items: + - const: nvidia,tegra234-gpcdma - const: nvidia,tegra194-gpcdma - const: nvidia,tegra186-gpcdma From patchwork Thu Jul 7 14:57:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akhil R X-Patchwork-Id: 1653659 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=Nvidia.com header.i=@Nvidia.com header.a=rsa-sha256 header.s=selector2 header.b=JFG4u9+G; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2022 14:58:07.5390 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 149d243b-5e5c-45da-a3ab-08da60291a46 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.236];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT019.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB6534 X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org In certain cases where the DMA client bus gets corrupted or if the end device ceases to send/receive data, DMA can wait indefinitely for the data to be received/sent. Attempting to terminate the transfer will put the DMA in pause flush mode and it remains there. The channel is irrecoverable once this pause times out in Tegra194 and earlier chips. Whereas, from Tegra234, it can be recovered by disabling the channel and reprograming it. Hence add a new terminate() function that ignores the outcome of dma_pause() so that terminate_all() can proceed to disable the channel. Signed-off-by: Akhil R --- drivers/dma/tegra186-gpc-dma.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/drivers/dma/tegra186-gpc-dma.c b/drivers/dma/tegra186-gpc-dma.c index 05cd451f541d..fa9bda4a2bc6 100644 --- a/drivers/dma/tegra186-gpc-dma.c +++ b/drivers/dma/tegra186-gpc-dma.c @@ -157,8 +157,8 @@ * If any burst is in flight and DMA paused then this is the time to complete * on-flight burst and update DMA status register. */ -#define TEGRA_GPCDMA_BURST_COMPLETE_TIME 20 -#define TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT 100 +#define TEGRA_GPCDMA_BURST_COMPLETE_TIME 10 +#define TEGRA_GPCDMA_BURST_COMPLETION_TIMEOUT 5000 /* 5 msec */ /* Channel base address offset from GPCDMA base address */ #define TEGRA_GPCDMA_CHANNEL_BASE_ADD_OFFSET 0x20000 @@ -432,6 +432,17 @@ static int tegra_dma_device_resume(struct dma_chan *dc) return 0; } +static inline int tegra_dma_pause_noerr(struct tegra_dma_channel *tdc) +{ + /* Return 0 irrespective of PAUSE status. + * This is useful to recover channels that can exit out of flush + * state when the channel is disabled. + */ + + tegra_dma_pause(tdc); + return 0; +} + static void tegra_dma_disable(struct tegra_dma_channel *tdc) { u32 csr, status; @@ -1292,6 +1303,14 @@ static const struct tegra_dma_chip_data tegra194_dma_chip_data = { .terminate = tegra_dma_pause, }; +static const struct tegra_dma_chip_data tegra234_dma_chip_data = { + .nr_channels = 31, + .channel_reg_size = SZ_64K, + .max_dma_count = SZ_1G, + .hw_support_pause = true, + .terminate = tegra_dma_pause_noerr, +}; + static const struct of_device_id tegra_dma_of_match[] = { { .compatible = "nvidia,tegra186-gpcdma", @@ -1299,6 +1318,9 @@ static const struct of_device_id tegra_dma_of_match[] = { }, { .compatible = "nvidia,tegra194-gpcdma", .data = &tegra194_dma_chip_data, + }, { + .compatible = "nvidia,tegra234-gpcdma", + .data = &tegra234_dma_chip_data, }, { }, }; From patchwork Thu Jul 7 14:57:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akhil R X-Patchwork-Id: 1653658 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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Signed-off-by: Akhil R --- arch/arm64/boot/dts/nvidia/tegra234.dtsi | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi index cf611eff7f6b..83d1ad7d3c8c 100644 --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi @@ -22,8 +22,9 @@ ranges = <0x0 0x0 0x0 0x40000000>; gpcdma: dma-controller@2600000 { - compatible = "nvidia,tegra194-gpcdma", - "nvidia,tegra186-gpcdma"; + compatible = "nvidia,tegra234-gpcdma", + "nvidia,tegra194-gpcdma", + "nvidia,tegra186-gpcdma"; reg = <0x2600000 0x210000>; resets = <&bpmp TEGRA234_RESET_GPCDMA>; reset-names = "gpcdma";