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From: Douglas Anderson <dianders@chromium.org>
To: Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: linux-arm-msm@vger.kernel.org, seanpaul@chromium.org,
	robdclark@chromium.org, Douglas Anderson <dianders@chromium.org>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Jonas Karlman <jonas@kwiboo.se>,
	Sandeep Panda <spanda@codeaurora.org>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH] drm/bridge: ti-sn65dsi86: Clear old error bits before AUX transfers
Date: Fri,  8 May 2020 16:33:29 -0700	[thread overview]
Message-ID: <20200508163314.1.Idfa69d5d3fc9623083c0ff78572fea87dccb199c@changeid> (raw)

The AUX channel transfer error bits in the status register are latched
and need to be cleared.  Clear them before doing our transfer so we
don't see old bits and get confused.

Without this patch having a single failure would mean that all future
transfers would look like they failed.

Fixes: b814ec6d4535 ("drm/bridge: ti-sn65dsi86: Implement AUX channel")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 6ad688b320ae..d865cc2565bc 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -827,6 +827,12 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
 				     buf[i]);
 	}
 
+	/* Clear old status bits before start so we don't get confused */
+	regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG,
+		     AUX_IRQ_STATUS_NAT_I2C_FAIL |
+		     AUX_IRQ_STATUS_AUX_RPLY_TOUT |
+		     AUX_IRQ_STATUS_AUX_SHORT);
+
 	regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND);
 
 	ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val,
-- 
2.26.2.645.ge9eca65c58-goog


WARNING: multiple messages have this Message-ID (diff)
From: Douglas Anderson <dianders@chromium.org>
To: Andrzej Hajda <a.hajda@samsung.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: robdclark@chromium.org, Jernej Skrabec <jernej.skrabec@siol.net>,
	Jonas Karlman <jonas@kwiboo.se>, David Airlie <airlied@linux.ie>,
	linux-arm-msm@vger.kernel.org,
	Douglas Anderson <dianders@chromium.org>,
	dri-devel@lists.freedesktop.org,
	Sandeep Panda <spanda@codeaurora.org>,
	seanpaul@chromium.org, linux-kernel@vger.kernel.org
Subject: [PATCH] drm/bridge: ti-sn65dsi86: Clear old error bits before AUX transfers
Date: Fri,  8 May 2020 16:33:29 -0700	[thread overview]
Message-ID: <20200508163314.1.Idfa69d5d3fc9623083c0ff78572fea87dccb199c@changeid> (raw)

The AUX channel transfer error bits in the status register are latched
and need to be cleared.  Clear them before doing our transfer so we
don't see old bits and get confused.

Without this patch having a single failure would mean that all future
transfers would look like they failed.

Fixes: b814ec6d4535 ("drm/bridge: ti-sn65dsi86: Implement AUX channel")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 6ad688b320ae..d865cc2565bc 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -827,6 +827,12 @@ static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
 				     buf[i]);
 	}
 
+	/* Clear old status bits before start so we don't get confused */
+	regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG,
+		     AUX_IRQ_STATUS_NAT_I2C_FAIL |
+		     AUX_IRQ_STATUS_AUX_RPLY_TOUT |
+		     AUX_IRQ_STATUS_AUX_SHORT);
+
 	regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND);
 
 	ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val,
-- 
2.26.2.645.ge9eca65c58-goog

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             reply	other threads:[~2020-05-08 23:33 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-08 23:33 Douglas Anderson [this message]
2020-05-08 23:33 ` [PATCH] drm/bridge: ti-sn65dsi86: Clear old error bits before AUX transfers Douglas Anderson
2020-05-15 21:48 ` Rob Clark
2020-05-15 21:48   ` Rob Clark
2020-05-18 18:01 ` Sam Ravnborg
2020-05-18 18:01   ` Sam Ravnborg

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