From: Ben Hutchings <bhutchings@solarflare.com>
Date: Thu, 8 Dec 2011 19:51:47 +0000 (+0000)
Subject: sfc: Correct interrupt timer quantum for Siena (normal and turbo mode)
X-Git-Tag: v3.4-rc1~177^2~452^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc180b69c009ec52f67a56d96b9073b9f774b323;p=pandora-kernel.git

sfc: Correct interrupt timer quantum for Siena (normal and turbo mode)

We currently assume that the timer quantum for Siena is 5 us, the same
as for Falcon.  This is not correct; timer ticks are generated on a
rota which takes a minimum of 768 cycles (each event delivery or other
timer change will delay it by 3 cycles).  The timer quantum should be
6.144 or 3.072 us depending on whether turbo mode is active.

Replace EFX_IRQ_MOD_RESOLUTION with a timer_quantum_ns field in struct
efx_nic, initialised by the efx_nic_type::probe function.

While we're at it, replace EFX_IRQ_MOD_MAX with a timer_period_max
field in struct efx_nic_type.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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