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dmaengine: qcom_hidma: allow ACPI/DT parameters to be overridden
Parameters like maximum read/write request size and the maximum number of active transactions are currently configured in DT/ACPI. This patch allows a user to override these to fine tune performance for their application. Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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parent
ccc0772927
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2 changed files with 51 additions and 3 deletions
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@ -1,7 +1,7 @@
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/*
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* Qualcomm Technologies HIDMA DMA engine interface
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*
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* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
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* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@ -795,8 +795,11 @@ static int hidma_probe(struct platform_device *pdev)
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device_property_read_u32(&pdev->dev, "desc-count",
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&dmadev->nr_descriptors);
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if (!dmadev->nr_descriptors && nr_desc_prm)
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if (nr_desc_prm) {
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dev_info(&pdev->dev, "overriding number of descriptors as %d\n",
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nr_desc_prm);
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dmadev->nr_descriptors = nr_desc_prm;
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}
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if (!dmadev->nr_descriptors)
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dmadev->nr_descriptors = HIDMA_NR_DEFAULT_DESC;
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@ -1,7 +1,7 @@
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/*
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* Qualcomm Technologies HIDMA DMA engine Management interface
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*
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* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
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* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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@ -49,6 +49,26 @@
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#define HIDMA_AUTOSUSPEND_TIMEOUT 2000
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#define HIDMA_MAX_CHANNEL_WEIGHT 15
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static unsigned int max_write_request;
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module_param(max_write_request, uint, 0644);
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MODULE_PARM_DESC(max_write_request,
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"maximum write burst (default: ACPI/DT value)");
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static unsigned int max_read_request;
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module_param(max_read_request, uint, 0644);
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MODULE_PARM_DESC(max_read_request,
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"maximum read burst (default: ACPI/DT value)");
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static unsigned int max_wr_xactions;
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module_param(max_wr_xactions, uint, 0644);
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MODULE_PARM_DESC(max_wr_xactions,
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"maximum number of write transactions (default: ACPI/DT value)");
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static unsigned int max_rd_xactions;
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module_param(max_rd_xactions, uint, 0644);
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MODULE_PARM_DESC(max_rd_xactions,
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"maximum number of read transactions (default: ACPI/DT value)");
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int hidma_mgmt_setup(struct hidma_mgmt_dev *mgmtdev)
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{
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unsigned int i;
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@ -207,12 +227,25 @@ static int hidma_mgmt_probe(struct platform_device *pdev)
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goto out;
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}
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if (max_write_request) {
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dev_info(&pdev->dev, "overriding max-write-burst-bytes: %d\n",
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max_write_request);
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mgmtdev->max_write_request = max_write_request;
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} else
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max_write_request = mgmtdev->max_write_request;
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rc = device_property_read_u32(&pdev->dev, "max-read-burst-bytes",
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&mgmtdev->max_read_request);
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if (rc) {
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dev_err(&pdev->dev, "max-read-burst-bytes missing\n");
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goto out;
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}
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if (max_read_request) {
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dev_info(&pdev->dev, "overriding max-read-burst-bytes: %d\n",
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max_read_request);
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mgmtdev->max_read_request = max_read_request;
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} else
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max_read_request = mgmtdev->max_read_request;
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rc = device_property_read_u32(&pdev->dev, "max-write-transactions",
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&mgmtdev->max_wr_xactions);
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@ -220,6 +253,12 @@ static int hidma_mgmt_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "max-write-transactions missing\n");
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goto out;
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}
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if (max_wr_xactions) {
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dev_info(&pdev->dev, "overriding max-write-transactions: %d\n",
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max_wr_xactions);
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mgmtdev->max_wr_xactions = max_wr_xactions;
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} else
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max_wr_xactions = mgmtdev->max_wr_xactions;
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rc = device_property_read_u32(&pdev->dev, "max-read-transactions",
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&mgmtdev->max_rd_xactions);
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@ -227,6 +266,12 @@ static int hidma_mgmt_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "max-read-transactions missing\n");
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goto out;
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}
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if (max_rd_xactions) {
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dev_info(&pdev->dev, "overriding max-read-transactions: %d\n",
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max_rd_xactions);
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mgmtdev->max_rd_xactions = max_rd_xactions;
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} else
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max_rd_xactions = mgmtdev->max_rd_xactions;
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mgmtdev->priority = devm_kcalloc(&pdev->dev,
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mgmtdev->dma_channels,
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