linux-kernel - [PATCH 03/21] drm: Add support for pps and compression mode command packet

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Date:   Mon,  9 Jul 2018 13:31:39 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     abhinavk@...eaurora.org, architt@...eaurora.org,
        chandanu@...eaurora.org, jsanka@...eaurora.org,
        jcrouse@...eaurora.org, ryadav@...eaurora.org,
        seanpaul@...omium.org, skolluku@...eaurora.org,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        airlied@...ux.ie, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, nganji@...eaurora.org,
        hoegsberg@...omium.org, dovizu@...omium.org, robh+dt@...nel.org
Cc:     vkorjani <vikas.korjani@...el.com>,
        Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH 03/21] drm: Add support for pps and compression mode command packet

From: vkorjani <vikas.korjani@...el.com>

After enabling DSC we need to send compression mode command packet
and pps data packet, for which 2 new data types are added
07h  Compression Mode Data Type Write , short write, 2 parameters
0Ah  PPS Long Write (word count determines number of bytes)
This patch adds support to send these packets.

Cc: David Airlie <airlied@...ux.ie>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-fbdev@...r.kernel.org

Signed-off-by: vkorjani <vikas.korjani@...el.com>
[seanpaul removed pps_write_buffer fn, added types to packet_format helpers]
Signed-off-by: Sean Paul <seanpaul@...omium.org>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 2 ++
 include/video/mipi_display.h   | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index bc73b7f5b9fc..80b75501f5c6 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -392,6 +392,7 @@ bool mipi_dsi_packet_format_is_short(u8 type)
 	case MIPI_DSI_DCS_SHORT_WRITE:
 	case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
 	case MIPI_DSI_DCS_READ:
+	case MIPI_DSI_DCS_COMPRESSION_MODE:
 	case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
 		return true;
 	}
@@ -410,6 +411,7 @@ EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
 bool mipi_dsi_packet_format_is_long(u8 type)
 {
 	switch (type) {
+	case MIPI_DSI_PPS_LONG_WRITE:
 	case MIPI_DSI_NULL_PACKET:
 	case MIPI_DSI_BLANKING_PACKET:
 	case MIPI_DSI_GENERIC_LONG_WRITE:
diff --git a/include/video/mipi_display.h b/include/video/mipi_display.h
index 19aa65a35546..49a53ef8da96 100644
--- a/include/video/mipi_display.h
+++ b/include/video/mipi_display.h
@@ -38,6 +38,9 @@ enum {
 
 	MIPI_DSI_DCS_READ				= 0x06,
 
+	MIPI_DSI_DCS_COMPRESSION_MODE                   = 0x07,
+	MIPI_DSI_PPS_LONG_WRITE                         = 0x0A,
+
 	MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE		= 0x37,
 
 	MIPI_DSI_END_OF_TRANSMISSION			= 0x08,
-- 
Sean Paul, Software Engineer, Google / Chromium OS