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serial: 8250_lpss: Use 16B DMA burst with Elkhart Lake

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commit 7090abd6ad upstream.

Configure DMA to use 16B burst size with Elkhart Lake. This makes the
bus use more efficient and works around an issue which occurs with the
previously used 1B.

The fix was initially developed by Srikanth Thokala and Aman Kumar.
This together with the previous config change is the cleaned up version
of the original fix.

Fixes: 0a9410b981 ("serial: 8250_lpss: Enable DMA on Intel Elkhart Lake")
Cc: <stable@vger.kernel.org> # serial: 8250_lpss: Configure DMA also w/o DMA filter
Reported-by: Wentong Wu <wentong.wu@intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20221108121952.5497-4-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen
2022-11-08 14:19:51 +02:00
committed by Greg Kroah-Hartman
parent b1a27b2aad
commit 2ac6276864
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/8250/8250_lpss.c
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@@ -177,6 +177,9 @@ static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
* matching with the registered General Purpose DMA controllers.
*/
up->dma = dma;
lpss->dma_maxburst = 16;
return 0;
}