Messages in this thread | | | Date | Mon, 29 Jan 2018 16:27:51 -0500 | From | Sean Paul <> | Subject | Re: [PATCH v2 24/43] drm/bridge: analogix_dp: Reset aux channel if an error occurred |
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On Fri, Jan 26, 2018 at 02:16:51PM +0100, Thierry Escande wrote: > From: Lin Huang <hl@rock-chips.com> > > AUX errors are caused by many different reasons. We may not know what > happened in aux channel on failure, so let's reset aux channel if some > errors occurred. > > Cc: 征增 王 <wzz@rock-chips.com> > Cc: Douglas Anderson <dianders@chromium.org> > Signed-off-by: Lin Huang <hl@rock-chips.com> > Signed-off-by: Sean Paul <seanpaul@chromium.org> > Signed-off-by: Thierry Escande <thierry.escande@collabora.com> > Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> > --- > drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 18 ++++++++++++++---- > 1 file changed, 14 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c > index dee1ba109b5f..7b7fd227e1f9 100644 > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c > @@ -466,6 +466,10 @@ void analogix_dp_init_aux(struct analogix_dp_device *dp) > reg = RPLY_RECEIV | AUX_ERR; > writel(reg, dp->reg_base + ANALOGIX_DP_INT_STA); > > + analogix_dp_set_analog_power_down(dp, AUX_BLOCK, true); > + usleep_range(10, 11);
This is kind of lame. I don't think this needs to be _exactly_ 10us, even 10/20 would be an improvement. Since this is so infrequent, it's not a dealbreaker either way, I guess.
Sean
> + analogix_dp_set_analog_power_down(dp, AUX_BLOCK, false); > + > analogix_dp_reset_aux(dp); > > /* Disable AUX transaction H/W retry */ > @@ -1159,7 +1163,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, > reg, !(reg & AUX_EN), 25, 500 * 1000); > if (ret) { > dev_err(dp->dev, "AUX CH enable timeout!\n"); > - return -ETIMEDOUT; > + goto aux_error; > } > > /* TODO: Wait for an interrupt instead of looping? */ > @@ -1168,7 +1172,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, > reg, reg & RPLY_RECEIV, 10, 20 * 1000); > if (ret) { > dev_err(dp->dev, "AUX CH cmd reply timeout!\n"); > - return -ETIMEDOUT; > + goto aux_error; > } > > /* Clear interrupt source for AUX CH command reply */ > @@ -1178,7 +1182,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, > reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA); > if (reg & AUX_ERR) { > writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA); > - return -EREMOTEIO; > + goto aux_error; > } > > /* Check AUX CH error access status */ > @@ -1186,7 +1190,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, > if ((reg & AUX_STATUS_MASK)) { > dev_err(dp->dev, "AUX CH error happened: %d\n\n", > reg & AUX_STATUS_MASK); > - return -EREMOTEIO; > + goto aux_error; > } > > if (msg->request & DP_AUX_I2C_READ) { > @@ -1212,4 +1216,10 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp, > msg->reply = DP_AUX_NATIVE_REPLY_ACK; > > return num_transferred > 0 ? num_transferred : -EBUSY; > + > +aux_error: > + /* if aux err happen, reset aux */ > + analogix_dp_init_aux(dp); > + > + return -EREMOTEIO; > } > -- > 2.14.1 >
-- Sean Paul, Software Engineer, Google / Chromium OS
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