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