OMAP: DSS2: Add Color Phase Rotation support

Add Color Phase Rotation (CPR) support and sysfs files to enable CPR and
to set the CPR coefficient matrix.

CPR is enabled via manager?/cpr_enable file, and the coefficient matrix
is set via manager?/cpr_coef file. The values in cpr_coef are in the
following order:

RR RG RB GR GG GB BR BG BB

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 151 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index ee2052f2ea02..1abed77e9897 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -1034,6 +1034,40 @@ void dispc_enable_gamma_table(bool enable)
         REG_FLD_MOD(DISPC_CONFIG, enable, 9, 9);
 }
 
+void dispc_enable_cpr(enum omap_channel channel, bool enable)
+{
+        u16 reg;
+
+        if (channel == OMAP_DSS_CHANNEL_LCD)
+                reg = DISPC_CONFIG;
+        else if (channel == OMAP_DSS_CHANNEL_LCD2)
+                reg = DISPC_CONFIG2;
+        else
+                return;
+
+        REG_FLD_MOD(reg, enable, 15, 15);
+}
+
+void dispc_set_cpr_coef(enum omap_channel channel,
+                struct omap_dss_cpr_coefs *coefs)
+{
+        u32 coef_r, coef_g, coef_b;
+
+        if (channel != OMAP_DSS_CHANNEL_LCD && channel != OMAP_DSS_CHANNEL_LCD2)
+                return;
+
+        coef_r = FLD_VAL(coefs->rr, 31, 22) | FLD_VAL(coefs->rg, 20, 11) |
+                FLD_VAL(coefs->rb, 9, 0);
+        coef_g = FLD_VAL(coefs->gr, 31, 22) | FLD_VAL(coefs->gg, 20, 11) |
+                FLD_VAL(coefs->gb, 9, 0);
+        coef_b = FLD_VAL(coefs->br, 31, 22) | FLD_VAL(coefs->bg, 20, 11) |
+                FLD_VAL(coefs->bb, 9, 0);
+
+        dispc_write_reg(DISPC_CPR_COEF_R(channel), coef_r);
+        dispc_write_reg(DISPC_CPR_COEF_G(channel), coef_g);
+        dispc_write_reg(DISPC_CPR_COEF_B(channel), coef_b);
+}
+
 static void _dispc_set_vid_color_conv(enum omap_plane plane, bool enable)
 {
         u32 val;
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 8ab6d43329bb..0b4166085b17 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -402,6 +402,9 @@ void dispc_setup_plane_fifo(enum omap_plane plane, u32 low, u32 high);
 void dispc_enable_fifomerge(bool enable);
 void dispc_set_burst_size(enum omap_plane plane,
                 enum omap_burst_size burst_size);
+void dispc_enable_cpr(enum omap_channel channel, bool enable);
+void dispc_set_cpr_coef(enum omap_channel channel,
+                struct omap_dss_cpr_coefs *coefs);
 
 void dispc_set_plane_ba0(enum omap_plane plane, u32 paddr);
 void dispc_set_plane_ba1(enum omap_plane plane, u32 paddr);
diff --git a/drivers/video/omap2/dss/manager.c b/drivers/video/omap2/dss/manager.c
index 665992d8cc9e..7ebaa40d3b56 100644
--- a/drivers/video/omap2/dss/manager.c
+++ b/drivers/video/omap2/dss/manager.c
@@ -275,6 +275,108 @@ static ssize_t manager_alpha_blending_enabled_store(
         return size;
 }
 
+static ssize_t manager_cpr_enable_show(struct omap_overlay_manager *mgr,
+                char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "%d\n", mgr->info.cpr_enable);
+}
+
+static ssize_t manager_cpr_enable_store(struct omap_overlay_manager *mgr,
+                const char *buf, size_t size)
+{
+        struct omap_overlay_manager_info info;
+        int v;
+        int r;
+        bool enable;
+
+        if (!dss_has_feature(FEAT_CPR))
+                return -ENODEV;
+
+        r = kstrtoint(buf, 0, &v);
+        if (r)
+                return r;
+
+        enable = !!v;
+
+        mgr->get_manager_info(mgr, &info);
+
+        if (info.cpr_enable == enable)
+                return size;
+
+        info.cpr_enable = enable;
+
+        r = mgr->set_manager_info(mgr, &info);
+        if (r)
+                return r;
+
+        r = mgr->apply(mgr);
+        if (r)
+                return r;
+
+        return size;
+}
+
+static ssize_t manager_cpr_coef_show(struct omap_overlay_manager *mgr,
+                char *buf)
+{
+        struct omap_overlay_manager_info info;
+
+        mgr->get_manager_info(mgr, &info);
+
+        return snprintf(buf, PAGE_SIZE,
+                        "%d %d %d %d %d %d %d %d %d\n",
+                        info.cpr_coefs.rr,
+                        info.cpr_coefs.rg,
+                        info.cpr_coefs.rb,
+                        info.cpr_coefs.gr,
+                        info.cpr_coefs.gg,
+                        info.cpr_coefs.gb,
+                        info.cpr_coefs.br,
+                        info.cpr_coefs.bg,
+                        info.cpr_coefs.bb);
+}
+
+static ssize_t manager_cpr_coef_store(struct omap_overlay_manager *mgr,
+                const char *buf, size_t size)
+{
+        struct omap_overlay_manager_info info;
+        struct omap_dss_cpr_coefs coefs;
+        int r, i;
+        s16 *arr;
+
+        if (!dss_has_feature(FEAT_CPR))
+                return -ENODEV;
+
+        if (sscanf(buf, "%hd %hd %hd %hd %hd %hd %hd %hd %hd",
+                                &coefs.rr, &coefs.rg, &coefs.rb,
+                                &coefs.gr, &coefs.gg, &coefs.gb,
+                                &coefs.br, &coefs.bg, &coefs.bb) != 9)
+                return -EINVAL;
+
+        arr = (s16[]){ coefs.rr, coefs.rg, coefs.rb,
+                coefs.gr, coefs.gg, coefs.gb,
+                coefs.br, coefs.bg, coefs.bb };
+
+        for (i = 0; i < 9; ++i) {
+                if (arr[i] < -512 || arr[i] > 511)
+                        return -EINVAL;
+        }
+
+        mgr->get_manager_info(mgr, &info);
+
+        info.cpr_coefs = coefs;
+
+        r = mgr->set_manager_info(mgr, &info);
+        if (r)
+                return r;
+
+        r = mgr->apply(mgr);
+        if (r)
+                return r;
+
+        return size;
+}
+
 struct manager_attribute {
         struct attribute attr;
         ssize_t (*show)(struct omap_overlay_manager *, char *);
@@ -300,6 +402,12 @@ static MANAGER_ATTR(trans_key_enabled, S_IRUGO|S_IWUSR,
 static MANAGER_ATTR(alpha_blending_enabled, S_IRUGO|S_IWUSR,
                 manager_alpha_blending_enabled_show,
                 manager_alpha_blending_enabled_store);
+static MANAGER_ATTR(cpr_enable, S_IRUGO|S_IWUSR,
+                manager_cpr_enable_show,
+                manager_cpr_enable_store);
+static MANAGER_ATTR(cpr_coef, S_IRUGO|S_IWUSR,
+                manager_cpr_coef_show,
+                manager_cpr_coef_store);
 
 
 static struct attribute *manager_sysfs_attrs[] = {
@@ -310,6 +418,8 @@ static struct attribute *manager_sysfs_attrs[] = {
         &manager_attr_trans_key_value.attr,
         &manager_attr_trans_key_enabled.attr,
         &manager_attr_alpha_blending_enabled.attr,
+        &manager_attr_cpr_enable.attr,
+        &manager_attr_cpr_coef.attr,
         NULL
 };
 
@@ -858,6 +968,10 @@ static void configure_manager(enum omap_channel channel)
         dispc_set_trans_key(channel, mi->trans_key_type, mi->trans_key);
         dispc_enable_trans_key(channel, mi->trans_enabled);
         dispc_enable_alpha_blending(channel, mi->alpha_enabled);
+        if (dss_has_feature(FEAT_CPR)) {
+                dispc_enable_cpr(channel, mi->cpr_enable);
+                dispc_set_cpr_coef(channel, &mi->cpr_coefs);
+        }
 }
 
 /* configure_dispc() tries to write values from cache to shadow registers.