media: rcar-csi2: Handle per-SoC number of channels

The R-Car CSI-2 interface has a number of selectable 'channels' that
provides pixel data to the VINs during image acquisition.

Each channel can be used to match a CSI-2 data type and a CSI-2 virtual
channel to be routed to output path.

Different SoCs have different number of channels, with R-Car E3 being the
notable exception supporting only 2 of them.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index 99f5b76852c0157b0f87782e19e359cf9e4ecadb..80ad906d1136c50177231b638cb0df9987fda557 100644 (file)
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -342,6 +342,7 @@ struct rcar_csi2_info {
        int (*confirm_start)(struct rcar_csi2 *priv);
        const struct rcsi2_mbps_reg *hsfreqrange;
        unsigned int csi0clkfreqrange;
+       unsigned int num_channels;
        bool clear_ulps;
 };
 
@@ -476,13 +477,14 @@ static int rcsi2_start(struct rcar_csi2 *priv)
        format = rcsi2_code_to_fmt(priv->mf.code);
 
        /*
-        * Enable all Virtual Channels.
+        * Enable all supported CSI-2 channels with virtual channel and
+        * data type matching.
         *
         * NOTE: It's not possible to get individual datatype for each
         *       source virtual channel. Once this is possible in V4L2
         *       it should be used here.
         */
-       for (i = 0; i < 4; i++) {
+       for (i = 0; i < priv->info->num_channels; i++) {
                u32 vcdt_part;
 
                vcdt_part = VCDT_SEL_VC(i) | VCDT_VCDTN_EN | VCDT_SEL_DTN_ON |
@@ -511,7 +513,8 @@ static int rcsi2_start(struct rcar_csi2 *priv)
        rcsi2_write(priv, FLD_REG, FLD_FLD_NUM(2) | FLD_FLD_EN4 |
                    FLD_FLD_EN3 | FLD_FLD_EN2 | FLD_FLD_EN);
        rcsi2_write(priv, VCDT_REG, vcdt);
-       rcsi2_write(priv, VCDT2_REG, vcdt2);
+       if (vcdt2)
+               rcsi2_write(priv, VCDT2_REG, vcdt2);
        /* Lanes are zero indexed. */
        rcsi2_write(priv, LSWAP_REG,
                    LSWAP_L0SEL(priv->lane_swap[0] - 1) |
@@ -940,32 +943,38 @@ static const struct rcar_csi2_info rcar_csi2_info_r8a7795 = {
        .init_phtw = rcsi2_init_phtw_h3_v3h_m3n,
        .hsfreqrange = hsfreqrange_h3_v3h_m3n,
        .csi0clkfreqrange = 0x20,
+       .num_channels = 4,
        .clear_ulps = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a7795es1 = {
        .hsfreqrange = hsfreqrange_m3w_h3es1,
+       .num_channels = 4,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a7796 = {
        .hsfreqrange = hsfreqrange_m3w_h3es1,
+       .num_channels = 4,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77965 = {
        .init_phtw = rcsi2_init_phtw_h3_v3h_m3n,
        .hsfreqrange = hsfreqrange_h3_v3h_m3n,
        .csi0clkfreqrange = 0x20,
+       .num_channels = 4,
        .clear_ulps = true,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77970 = {
        .init_phtw = rcsi2_init_phtw_v3m_e3,
        .confirm_start = rcsi2_confirm_start_v3m_e3,
+       .num_channels = 4,
 };
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a77990 = {
        .init_phtw = rcsi2_init_phtw_v3m_e3,
        .confirm_start = rcsi2_confirm_start_v3m_e3,
+       .num_channels = 2,
 };
 
 static const struct of_device_id rcar_csi2_of_table[] = {