| Message ID | 20170310043305.17216-27-seanpaul@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 10.03.2017 05:32, Sean Paul 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> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> Few questions below: > --- > 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 377bee4e20fd..1cb57e528ec8 100644 > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c > @@ -465,6 +465,10 @@ 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); > + analogix_dp_set_analog_power_down(dp, AUX_BLOCK, false); > + > analogix_dp_reset_aux(dp); > > /* Disable AUX transaction H/W retry */ > @@ -1158,7 +1162,7 @@ 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? */ > @@ -1167,7 +1171,7 @@ 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 */ > @@ -1177,7 +1181,7 @@ 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 */ > @@ -1185,7 +1189,7 @@ 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) { > @@ -1211,4 +1215,10 @@ 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; You are masking original error values here, is it intended? > }
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c index 377bee4e20fd..1cb57e528ec8 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c @@ -465,6 +465,10 @@ 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); + analogix_dp_set_analog_power_down(dp, AUX_BLOCK, false); + analogix_dp_reset_aux(dp); /* Disable AUX transaction H/W retry */ @@ -1158,7 +1162,7 @@ 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? */ @@ -1167,7 +1171,7 @@ 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 */ @@ -1177,7 +1181,7 @@ 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 */ @@ -1185,7 +1189,7 @@ 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) { @@ -1211,4 +1215,10 @@ 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; }