i.MX Processors中的主题 Re: IMX8MP and sec-dsim.c support

IMX8MP and sec-dsim.c support

tylernol — Thu, 20 Apr 2023 17:55:48 GMT

hi there,

I am attempting to bring up a panel connected via MIPI DSI to the imx8MP . While looking at the source for the DSI bridge driver, I noticed that the driver has "disappeared" from the fslc branch.

This is the last occurrance I see : https://github.com/Freescale/linux-fslc/commits/5.15-2.2.x-imx/drivers/gpu/drm/bridge/sec-dsim.c

I am currently using this branch:

linux-imx_5.10.72_2.2.0

where has the driver moved to in more current branches? I see some activity to consolidate with a Samsung version.

thanks!

Re: IMX8MP and sec-dsim.c support

Bio_TICFSL — Fri, 21 Apr 2023 13:01:18 GMT

Hello,

You need to check if your kernel is available from the new git:

https://github.com/nxp-imx

Regards

Re: IMX8MP and sec-dsim.c support

tylernol — Fri, 21 Apr 2023 16:35:10 GMT

the driver still exists here, good! The line I am curious about is unchanged, so I will ask here. https://github.com/nxp-imx/linux-imx/blob/29549c7073bf72cfb2c4614d37de45ec36b60475/drivers/gpu/drm/bridge/sec-dsim.c#L695

```

if (packet.payload_length) {		/* Long Packet case */
		reinit_completion(&dsim->pl_tx_done);

		/* write packet payload */
		sec_mipi_dsim_write_pl_to_sfr_fifo(dsim,
						   packet.payload,
						   packet.payload_length);

		/* write packet header */
		sec_mipi_dsim_write_ph_to_sfr_fifo(dsim,
						   packet.header,
						   use_lpm);

		ret = wait_for_completion_timeout(&dsim->ph_tx_done,
						  MIPI_FIFO_TIMEOUT);
		if (!ret) {
			dev_err(dsim->dev, "wait payload tx done time out\n");
			return -EBUSY;
		}
	}
```

we are resetting

dsim->pl_tx_done

however we are waiting on :

wait_for_completion_timeout(&dsim->ph_tx_done,

is this correct? Does the hw generate interrupts for both the pl_tx and the ph_tx for long packets?

Re: IMX8MP and sec-dsim.c support

tylernol — Fri, 28 Apr 2023 20:56:38 GMT

this appears to be fine. Determined that there was bug in the clock enable sequencing, so commands were not being sent out.

Re: IMX8MP and sec-dsim.c support

persandberg — Tue, 16 Dec 2025 09:25:02 GMT

Hi,

I was wondering the same thing. Have you solved this? Why is it waiting for ph_tx_done instead of pl_tx_done.