dri-devel.lists.freedesktop.org archive mirror
 help / color / mirror / Atom feed
From: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: vandita.kulkarni@intel.com, uma.shankar@intel.com,
	dri-devel@lists.freedesktop.org, swati2.sharma@intel.com
Subject: [RFC 7/8] drm/dp_helper: Add support for link status and link recovery
Date: Tue,  6 Oct 2020 15:17:18 +0530	[thread overview]
Message-ID: <20201006094719.24119-8-ankit.k.nautiyal@intel.com> (raw)
In-Reply-To: <20201006094719.24119-1-ankit.k.nautiyal@intel.com>

From: Swati Sharma <swati2.sharma@intel.com>

This patch adds support for link status and link recovery. There
are specific DPCD’s defined for link status check and recovery in
case of any issues. PCON will communicate the same using an IRQ_HPD
to source. HDMI sink would have indicated the same to PCON using
SCDC interrupt mechanism. While source can always read final HDMI
sink’s status using I2C over AUX, it’s easier and faster to read
the PCON’s already read HDMI sink’s status registers.

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 33 +++++++++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h     | 16 ++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 39d8e4d665b7..131ea604321b 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -2671,3 +2671,36 @@ int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask)
 	return mode;
 }
 EXPORT_SYMBOL(drm_dp_pcon_hdmi_link_mode);
+
+void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux,
+					   struct drm_connector *connector)
+{
+	u8 buf, error_count;
+	int i, num_error;
+	struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
+
+	for (i = 0; i < hdmi->max_lane; i++)
+	{
+		if (drm_dp_dpcd_readb(aux, DP_PCON_HDMI_ERROR_STATUS_LN0 + i , &buf) < 0)
+			return;
+
+		error_count = buf & DP_PCON_HDMI_ERROR_COUNT_MASK;
+
+	switch(error_count) {
+	case DP_PCON_HDMI_ERROR_COUNT_HUNDRED_PLUS:
+		num_error = 100;
+		break;
+	case DP_PCON_HDMI_ERROR_COUNT_TEN_PLUS:
+		num_error = 10;
+		break;
+	case DP_PCON_HDMI_ERROR_COUNT_THREE_PLUS:
+		num_error = 3;
+		break;
+	default:
+		num_error = 0;
+	}
+
+		DRM_ERROR("More than %d errors since the last read for lane %d", num_error, i);
+	}
+}
+EXPORT_SYMBOL(drm_dp_pcon_hdmi_frl_link_error_count);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 82fa75f6cc86..9397410390e7 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -946,6 +946,11 @@ struct drm_device;
 # define DP_CEC_IRQ                          (1 << 2)
 
 #define DP_LINK_SERVICE_IRQ_VECTOR_ESI0     0x2005   /* 1.2 */
+# define RX_CAP_CHANGED                      (1 << 0)
+# define LINK_STATUS_CHANGED                 (1 << 1)
+# define STREAM_STATUS_CHANGED               (1 << 2)
+# define HDMI_LINK_STATUS_CHANGED            (1 << 3)
+# define CONNECTED_OFF_ENTRY_REQUESTED       (1 << 4)
 
 #define DP_PSR_ERROR_STATUS                 0x2006  /* XXX 1.2? */
 # define DP_PSR_LINK_CRC_ERROR              (1 << 0)
@@ -1130,6 +1135,16 @@ struct drm_device;
 #define DP_PROTOCOL_CONVERTER_CONTROL_2		0x3052 /* DP 1.3 */
 # define DP_CONVERSION_TO_YCBCR422_ENABLE	(1 << 0) /* DP 1.3 */
 
+/* PCON Downstream HDMI ERROR Status per Lane */
+#define DP_PCON_HDMI_ERROR_STATUS_LN0          0x3037
+#define DP_PCON_HDMI_ERROR_STATUS_LN1          0x3038
+#define DP_PCON_HDMI_ERROR_STATUS_LN2          0x3039
+#define DP_PCON_HDMI_ERROR_STATUS_LN3          0x303A
+# define DP_PCON_HDMI_ERROR_COUNT_MASK         (0x7 << 0)
+# define DP_PCON_HDMI_ERROR_COUNT_THREE_PLUS   (1 << 0)
+# define DP_PCON_HDMI_ERROR_COUNT_TEN_PLUS     (1 << 1)
+# define DP_PCON_HDMI_ERROR_COUNT_HUNDRED_PLUS (1 << 2)
+
 /* HDCP 1.3 and HDCP 2.2 */
 #define DP_AUX_HDCP_BKSV		0x68000
 #define DP_AUX_HDCP_RI_PRIME		0x68005
@@ -1985,4 +2000,5 @@ int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux);
 
 bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux);
 int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask);
+void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux, struct drm_connector *connector);
 #endif /* _DRM_DP_HELPER_H_ */
-- 
2.17.1

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  parent reply	other threads:[~2020-10-06  9:54 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-06  9:47 [RFC 0/8] Add support for DP-HDMI2.1 PCON Ankit Nautiyal
2020-10-06  9:47 ` [RFC 1/8] drm/edid: Add additional HFVSDB fields for HDMI2.1 Ankit Nautiyal
2020-10-06  9:47 ` [RFC 2/8] drm/edid: Parse MAX_FRL field from HFVSDB block Ankit Nautiyal
2020-10-06  9:47 ` [RFC 3/8] drm/dp_helper: Add FRL training support for a DP-HDMI2.1 PCON Ankit Nautiyal
2020-10-06  9:47 ` [RFC 4/8] drm/i915: Capture max frl rate for PCON in dfp cap structure Ankit Nautiyal
2020-10-06  9:47 ` [RFC 5/8] drm/i915: Add support for starting FRL training for HDMI2.1 via PCON Ankit Nautiyal
2020-10-06  9:47 ` [RFC 6/8] drm/i915: Check for FRL training before DP Link training Ankit Nautiyal
2020-10-06  9:47 ` Ankit Nautiyal [this message]
2020-10-06  9:47 ` [RFC 8/8] drm/i915: Add support for enabling link status and recovery Ankit Nautiyal

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201006094719.24119-8-ankit.k.nautiyal@intel.com \
    --to=ankit.k.nautiyal@intel.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=intel-gfx@lists.freedesktop.org \
    --cc=swati2.sharma@intel.com \
    --cc=uma.shankar@intel.com \
    --cc=vandita.kulkarni@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).