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Message-Id: <20180115171614.14474-25-thierry.escande@collabora.com>
Date: Mon, 15 Jan 2018 18:15:58 +0100
From: Thierry Escande <thierry.escande@...labora.com>
To: Archit Taneja <architt@...eaurora.org>,
Inki Dae <inki.dae@...sung.com>,
Thierry Reding <thierry.reding@...il.com>,
Sandy Huang <hjc@...k-chips.com>,
Sean Paul <seanpaul@...omium.org>,
David Airlie <airlied@...ux.ie>
Cc: Tomasz Figa <tfiga@...omium.org>, Haixia Shi <hshi@...omium.org>,
Ørjan Eide <orjan.eide@....com>,
zain wang <wzz@...k-chips.com>,
Yakir Yang <ykk@...k-chips.com>, Lin Huang <hl@...k-chips.com>,
Douglas Anderson <dianders@...omium.org>,
Mark Yao <mark.yao@...k-chips.com>,
linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH 24/40] drm/bridge: analogix_dp: Reset aux channel if an error occurred
From: Lin Huang <hl@...k-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@...k-chips.com>
Cc: Douglas Anderson <dianders@...omium.org>
Signed-off-by: Lin Huang <hl@...k-chips.com>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
Reviewed-by: Andrzej Hajda <a.hajda@...sung.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);
+ 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
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