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i2c: i2c-msm-geni: Selectively disable DMA and operate in FIFO mode

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Currently for SSC QUP, we are not supporting the DMA mode
on SA8155 and SA8195 platform. so for some non-gsi transfer
if the mode of SE is DMA then it will switch to the FIFO
mode and complete the transfer.

Change-Id: I4cbc2ed9ceff7d1c4fdfec3a1efeda80af2fc2bf
Signed-off-by: Aniket Randive <arandive@codeaurora.org>
This commit is contained in:
Aniket Randive 2021-01-22 10:01:07 +05:30 • committed by Gerrit - the friendly Code Review server
commit 07a4e443dd
1 changed files with 13 additions and 1 deletions
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14
drivers/i2c/busses/i2c-msm-geni.c
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@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
*/
#include <linux/clk.h>
@ -132,6 +132,7 @@ struct geni_i2c_dev {
bool req_chan;
bool first_resume;
bool gpi_reset;
bool disable_dma_mode;
};
static struct geni_i2c_dev *gi2c_dev_dbg[MAX_SE];
@ -1030,6 +1031,14 @@ static int geni_i2c_xfer(struct i2c_adapter *adap,
qcom_geni_i2c_calc_timeout(gi2c);
mode = msgs[i].len > 32 ? SE_DMA : FIFO_MODE;
/* Complete the transfer in FIFO mode if DMA mode
* is not supported for some Automotive platform.
*/
if (gi2c->disable_dma_mode) {
GENI_SE_DBG(gi2c->ipcl, false, gi2c->dev,
"Disable DMA mode\n");
mode = FIFO_MODE;
}
ret = geni_se_select_mode(gi2c->base, mode);
if (ret) {
dev_err(gi2c->dev, "%s: Error mode init %d:%d:%d\n",
@ -1283,6 +1292,9 @@ static int geni_i2c_probe(struct platform_device *pdev)
return ret;
}
gi2c->disable_dma_mode = of_property_read_bool(pdev->dev.of_node,
"qcom,disable-dma");
gi2c->irq = platform_get_irq(pdev, 0);
if (gi2c->irq < 0)
return gi2c->irq;