usb: dwc2: set ahbcfg parameter for STM32MP15 OTG HS and FS

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STM32MP15 ahbcfg register default value sets Burst length/type (HBSTLEN)
to Single (32-bit accesses on AHB), which is not recommended, according
to STM32MP157 Reference manual [1].
This patch sets Burst length/type (HBSTLEN) so that bus transactions
target 16x32 bit accesses. This improves OTG controller performance.

[1] https://www.st.com/resource/en/reference_manual/dm00327659.pdf, p.3149

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20210105094855.30763-2-amelie.delaunay@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Amelie Delaunay 2021-01-05 10:48:53 +01:00 • committed by Greg Kroah-Hartman

parent 8653d71ce3

commit 2979ee7a91

1 changed files with 2 additions and 0 deletions

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drivers/usb/dwc2/params.c

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