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71 lines
2.1 KiB
Diff
71 lines
2.1 KiB
Diff
From 9de3b340d84b75f93081f871b640a065cba4ded0 Mon Sep 17 00:00:00 2001
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From: Peng Ma <peng.ma@nxp.com>
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Date: Tue, 26 Nov 2019 16:02:00 +0800
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Subject: [PATCH] LF-162: i2c: imx: Defer probing if EDMA not available
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EDMA may be not available or defered due to dependencies on
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other modules, If these scenarios is encountered, we should
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defer probing.
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Signed-off-by: Peng Ma <peng.ma@nxp.com>
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---
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drivers/i2c/busses/i2c-imx.c | 16 +++++++++++-----
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1 file changed, 11 insertions(+), 5 deletions(-)
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--- a/drivers/i2c/busses/i2c-imx.c
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+++ b/drivers/i2c/busses/i2c-imx.c
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@@ -369,8 +369,8 @@ static void i2c_imx_reset_regs(struct im
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}
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/* Functions for DMA support */
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-static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
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- dma_addr_t phy_addr)
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+static int i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
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+ dma_addr_t phy_addr)
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{
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struct imx_i2c_dma *dma;
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struct dma_slave_config dma_sconfig;
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@@ -379,7 +379,7 @@ static void i2c_imx_dma_request(struct i
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dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
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if (!dma)
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- return;
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+ return -ENOMEM;
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dma->chan_tx = dma_request_chan(dev, "tx");
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if (IS_ERR(dma->chan_tx)) {
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@@ -424,7 +424,7 @@ static void i2c_imx_dma_request(struct i
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dev_info(dev, "using %s (tx) and %s (rx) for DMA transfers\n",
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dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx));
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- return;
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+ return 0;
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fail_rx:
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dma_release_channel(dma->chan_rx);
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@@ -432,6 +432,8 @@ fail_tx:
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dma_release_channel(dma->chan_tx);
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fail_al:
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devm_kfree(dev, dma);
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+
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+ return ret;
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}
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static void i2c_imx_dma_callback(void *arg)
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@@ -1602,10 +1604,14 @@ static int i2c_imx_probe(struct platform
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dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
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/* Init DMA config if supported */
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- i2c_imx_dma_request(i2c_imx, phy_addr);
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+ ret = i2c_imx_dma_request(i2c_imx, phy_addr);
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+ if (ret == -EPROBE_DEFER)
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+ goto i2c_adapter_remove;
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return 0; /* Return OK */
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+i2c_adapter_remove:
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+ i2c_del_adapter(&i2c_imx->adapter);
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clk_notifier_unregister:
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clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
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rpm_disable:
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