On Tue, Mar 17, 2015 at 06:40:18PM +0200, Ville Syrjälä wrote:
> On Tue, Mar 17, 2015 at 05:18:54PM +0200, Jani Nikula wrote:
> > Allow for a larger receive data size, and check if the receiver returned
> > the number of bytes written. Without this, we've basically skipped all
> > the unwritten bytes for short writes.
> >
> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>
> Whoops :)
>
> Looks correct to me.
>
> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Queued for -next, thanks for the patch.
-Daniel
>
> > ---
> > drivers/gpu/drm/i915/intel_dp.c | 11 ++++++++---
> > 1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 5256c064da05..3967af10f53c 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -951,7 +951,7 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
> > case DP_AUX_NATIVE_WRITE:
> > case DP_AUX_I2C_WRITE:
> > txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
> > - rxsize = 1;
> > + rxsize = 2; /* 0 or 1 data bytes */
> >
> > if (WARN_ON(txsize > 20))
> > return -E2BIG;
> > @@ -962,8 +962,13 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
> > if (ret > 0) {
> > msg->reply = rxbuf[0] >> 4;
> >
> > - /* Return payload size. */
> > - ret = msg->size;
> > + if (ret > 1) {
> > + /* Number of bytes written in a short write. */
> > + ret = clamp_t(int, rxbuf[1], 0, msg->size);
> > + } else {
> > + /* Return payload size. */
> > + ret = msg->size;
> > + }
> > }
> > break;
> >
> > --
> > 2.1.4
>
> --
> Ville Syrjälä
> Intel OTC
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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