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drm/i915/dsi: refine send MIPI DCS command sequence

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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
This commit is contained in:
Lee Shawn C 2021-09-08 19:56:04 +08:00 committed by Vandita Kulkarni
parent 43315f86a3
commit 5ebd50d394
1 changed files with 5 additions and 5 deletions
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10
drivers/gpu/drm/i915/display/icl_dsi.c
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@ -1831,11 +1831,6 @@ 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);
@ -1843,6 +1838,11 @@ 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;