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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>
This commit is contained in:
Sinan Kaya 2017-06-22 14:59:22 -04:00 committed by Vinod Koul
parent ccc0772927
commit 13058e3304
2 changed files with 51 additions and 3 deletions
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7
drivers/dma/qcom/hidma.c
View File

@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA DMA engine interface
*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -795,8 +795,11 @@ static int hidma_probe(struct platform_device *pdev)
device_property_read_u32(&pdev->dev, "desc-count",
&dmadev->nr_descriptors);
if (!dmadev->nr_descriptors && nr_desc_prm)
if (nr_desc_prm) {
dev_info(&pdev->dev, "overriding number of descriptors as %d\n",
nr_desc_prm);
dmadev->nr_descriptors = nr_desc_prm;
}
if (!dmadev->nr_descriptors)
dmadev->nr_descriptors = HIDMA_NR_DEFAULT_DESC;

47
drivers/dma/qcom/hidma_mgmt.c
View File

@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA DMA engine Management interface
*
* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@ -49,6 +49,26 @@
#define HIDMA_AUTOSUSPEND_TIMEOUT 2000
#define HIDMA_MAX_CHANNEL_WEIGHT 15
static unsigned int max_write_request;
module_param(max_write_request, uint, 0644);
MODULE_PARM_DESC(max_write_request,
"maximum write burst (default: ACPI/DT value)");
static unsigned int max_read_request;
module_param(max_read_request, uint, 0644);
MODULE_PARM_DESC(max_read_request,
"maximum read burst (default: ACPI/DT value)");
static unsigned int max_wr_xactions;
module_param(max_wr_xactions, uint, 0644);
MODULE_PARM_DESC(max_wr_xactions,
"maximum number of write transactions (default: ACPI/DT value)");
static unsigned int max_rd_xactions;
module_param(max_rd_xactions, uint, 0644);
MODULE_PARM_DESC(max_rd_xactions,
"maximum number of read transactions (default: ACPI/DT value)");
int hidma_mgmt_setup(struct hidma_mgmt_dev *mgmtdev)
{
unsigned int i;
@ -207,12 +227,25 @@ static int hidma_mgmt_probe(struct platform_device *pdev)
goto out;
}
if (max_write_request) {
dev_info(&pdev->dev, "overriding max-write-burst-bytes: %d\n",
max_write_request);
mgmtdev->max_write_request = max_write_request;
} else
max_write_request = mgmtdev->max_write_request;
rc = device_property_read_u32(&pdev->dev, "max-read-burst-bytes",
&mgmtdev->max_read_request);
if (rc) {
dev_err(&pdev->dev, "max-read-burst-bytes missing\n");
goto out;
}
if (max_read_request) {
dev_info(&pdev->dev, "overriding max-read-burst-bytes: %d\n",
max_read_request);
mgmtdev->max_read_request = max_read_request;
} else
max_read_request = mgmtdev->max_read_request;
rc = device_property_read_u32(&pdev->dev, "max-write-transactions",
&mgmtdev->max_wr_xactions);
@ -220,6 +253,12 @@ static int hidma_mgmt_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "max-write-transactions missing\n");
goto out;
}
if (max_wr_xactions) {
dev_info(&pdev->dev, "overriding max-write-transactions: %d\n",
max_wr_xactions);
mgmtdev->max_wr_xactions = max_wr_xactions;
} else
max_wr_xactions = mgmtdev->max_wr_xactions;
rc = device_property_read_u32(&pdev->dev, "max-read-transactions",
&mgmtdev->max_rd_xactions);
@ -227,6 +266,12 @@ static int hidma_mgmt_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "max-read-transactions missing\n");
goto out;
}
if (max_rd_xactions) {
dev_info(&pdev->dev, "overriding max-read-transactions: %d\n",
max_rd_xactions);
mgmtdev->max_rd_xactions = max_rd_xactions;
} else
max_rd_xactions = mgmtdev->max_rd_xactions;
mgmtdev->priority = devm_kcalloc(&pdev->dev,
mgmtdev->dma_channels,