From 203b4cb49eb6b401893d1b6160380d3a4faa1856 Mon Sep 17 00:00:00 2001
From: Cho KyongHo <pullip.cho@samsung.com>
Date: Mon, 16 Oct 2017 15:58:53 +0900
Subject: [PATCH] [COMMON] g2d: add support for custom tone mapping LUT

The look-up table for tone mapping can be overwritten by the superuser
through the module parameter of hdr_tunables module intorduced by
"video: hdr: add tunable parameters for HDR" commit.
Once tone mapping LUT has been written to the parameter and becomes
valid, it is immediately applied to every tasks executed by G2D. All
tone mapping coefficients are overwritten with the values in the
paramter.

Change-Id: I871bfe6d9ab4740ad8519b09f0a5b1bce257d1c3
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>
---
 drivers/gpu/exynos/g2d/g2d_command.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/exynos/g2d/g2d_command.c b/drivers/gpu/exynos/g2d/g2d_command.c
index b03018e28886..3fc110201a05 100644
--- a/drivers/gpu/exynos/g2d/g2d_command.c
+++ b/drivers/gpu/exynos/g2d/g2d_command.c
@@ -17,6 +17,8 @@
 #include <linux/uaccess.h>
 #include <linux/device.h>
 
+#include <video/exynos_hdr_tunables.h>
+
 #include "g2d.h"
 #include "g2d_task.h"
 #include "g2d_uapi.h"
@@ -155,7 +157,8 @@ void g2d_set_start_commands(struct g2d_task *task)
 void g2d_complete_commands(struct g2d_task *task)
 {
 	/* 832 is the total number of the G2D registers */
-	BUG_ON(task->cmd_count > 830);
+	/* Tuned tone mapping LUT (66 entries) might be specified */
+	BUG_ON(task->cmd_count > 896);
 
 	g2d_set_taskctl_commands(task);
 
@@ -782,6 +785,7 @@ int g2d_import_commands(struct g2d_device *g2d_dev, struct g2d_task *task,
 	struct device *dev = g2d_dev->dev;
 	struct g2d_reg *cmdaddr = page_address(task->cmd_page);
 	struct g2d_commands *cmds = &data->commands;
+	u32 tm_tuned_lut[NR_TM_LUT_VALUES];
 	unsigned int i;
 	int copied;
 
@@ -834,6 +838,21 @@ int g2d_import_commands(struct g2d_device *g2d_dev, struct g2d_task *task,
 
 	task->cmd_count += cmds->num_extra_regs;
 
+	/* overwrite if TM LUT values are specified: consumes 66 entries  */
+	if (exynos_hdr_get_tm_lut(tm_tuned_lut)) {
+		u32 base;
+		/* offsets of TM LUT values: 0x3600, 0x3700 */
+		cmdaddr += cmds->num_extra_regs;
+		for (base = 0x3600; base < 0x3800; base += 0x100) {
+			for (i = 0; i < NR_TM_LUT_VALUES; i++) {
+				cmdaddr->offset = base + i * sizeof(u32);
+				cmdaddr->value = tm_tuned_lut[i];
+				cmdaddr++;
+				task->cmd_count++;
+			}
+		}
+	}
+
 	return 0;
 }
 
-- 
2.20.1