Commit f2a3f513 authored by Carlos Song's avatar Carlos Song Committed by Wolfram Sang
Browse files

i2c: imx-lpi2c: change to PIO mode in system-wide suspend/resume progress 



EDMA resumes early and suspends late in the system power transition
sequence, while LPI2C enters the NOIRQ stage for both suspend and resume.
This means LPI2C resources become available before EDMA is fully resumed.
Once IRQs are enabled, a slave device may immediately trigger an LPI2C
transfer. If the transfer length meets DMA requirements, the driver will
attempt to use EDMA even though EDMA may still be unavailable.

This timing gap can lead to transfer failures. To prevent this, force
LPI2C to use PIO mode during system-wide suspend and resume transitions.
This reduces dependency on EDMA and avoids using an unready DMA resource.

Fixes: a09c8b3f ("i2c: imx-lpi2c: add eDMA mode support for LPI2C")
Signed-off-by: default avatarCarlos Song <carlos.song@nxp.com>
Reviewed-by: default avatarFrank Li <Frank.Li@nxp.com>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
parent c0c50e37

drivers/i2c/busses/i2c-imx-lpi2c.c

+7 −0
Original line number Diff line number Diff line
@@ -592,6 +592,13 @@ static bool is_use_dma(struct lpi2c_imx_struct *lpi2c_imx, struct i2c_msg *msg) 
	if (!lpi2c_imx->can_use_dma)

		return false;



	/*

	 * A system-wide suspend or resume transition is in progress. LPI2C should use PIO to

	 * transfer data to avoid issue caused by no ready DMA HW resource.

	 */

	if (pm_suspend_in_progress())

		return false;



	/*

	 * When the length of data is less than I2C_DMA_THRESHOLD,

	 * cpu mode is used directly to avoid low performance.