From ebf081ab96aef9860fdf747b64520280ce6f610e Mon Sep 17 00:00:00 2001
From: Lee Shawn C <shawn.c.lee@intel.com>
Date: Wed, 8 Sep 2021 19:56:04 +0800
Subject: drm/i915/dsi: refine send MIPI DCS command sequence
Git-commit: 5ebd50d3948ee596db02399a09b4561ed82aee57
Patch-mainline: v5.16-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
According to chapter "Sending Commands to the Panel" in bspec #29738
and #49188. If driver try to send DCS long pakcet, we have to program
TX payload register at first. And configure TX header HW register later.
DSC long packet would not be sent properly if we don't follow this
sequence.
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Cc: William Tseng <william.tseng@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210908115607.9633-3-shawn.c.lee@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/display/icl_dsi.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 9f2b63cf9f37..bd210166b079 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -1837,11 +1837,6 @@ static ssize_t gen11_dsi_host_transfer(struct mipi_dsi_host *host,
if (msg->flags & MIPI_DSI_MSG_USE_LPM)
enable_lpdt = true;
- /* send packet header */
- ret = dsi_send_pkt_hdr(intel_dsi_host, dsi_pkt, enable_lpdt);
- if (ret < 0)
- return ret;
-
/* only long packet contains payload */
if (mipi_dsi_packet_format_is_long(msg->type)) {
ret = dsi_send_pkt_payld(intel_dsi_host, dsi_pkt);
@@ -1849,6 +1844,11 @@ static ssize_t gen11_dsi_host_transfer(struct mipi_dsi_host *host,
return ret;
}
+ /* send packet header */
+ ret = dsi_send_pkt_hdr(intel_dsi_host, dsi_pkt, enable_lpdt);
+ if (ret < 0)
+ return ret;
+
//TODO: add payload receive code if needed
ret = sizeof(dsi_pkt.header) + dsi_pkt.payload_length;
--
2.38.1