From: Wojciech Dubowik <[email protected]> The chip supports output lvds lanes in two orders, the default <1 2 3 4> and <4 3 2 1>. Add parsing of an optional output lvds data-lanes property so we can inform chip that the lanes have been reversed.
Signed-off-by: Wojciech Dubowik <[email protected]> --- drivers/gpu/drm/bridge/ti-sn65dsi83.c | 31 +++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c index f8a786953526..df44df2e872a 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c @@ -148,6 +148,18 @@ enum sn65dsi83_lvds_term { OHM_200 }; +enum { + LANE_MAPPING_NORMAL, + LANE_MAPPING_REVERSE, +}; + +#define DATA_LANES_COUNT 4 + +static const u32 supported_data_lane_mapping[][DATA_LANES_COUNT] = { + [LANE_MAPPING_NORMAL] = { 1, 2, 3, 4 }, + [LANE_MAPPING_REVERSE] = { 4, 3, 2, 1}, +}; + enum sn65dsi83_model { MODEL_SN65DSI83, MODEL_SN65DSI84, @@ -163,6 +175,7 @@ struct sn65dsi83 { struct regulator *vcc; bool lvds_dual_link; bool lvds_dual_link_even_odd_swap; + bool lvds_reverse_lanes_conf[2]; int lvds_vod_swing_conf[2]; int lvds_term_conf[2]; int irq; @@ -644,6 +657,10 @@ static void sn65dsi83_atomic_pre_enable(struct drm_bridge *bridge, regmap_write(ctx->regmap, REG_LVDS_LANE, (ctx->lvds_dual_link_even_odd_swap ? REG_LVDS_LANE_EVEN_ODD_SWAP : 0) | + (ctx->lvds_reverse_lanes_conf[CHANNEL_A] ? + REG_LVDS_LANE_CHA_REVERSE_LVDS : 0) | + (ctx->lvds_reverse_lanes_conf[CHANNEL_B] ? + REG_LVDS_LANE_CHB_REVERSE_LVDS : 0) | (ctx->lvds_term_conf[CHANNEL_A] ? REG_LVDS_LANE_CHA_LVDS_TERM : 0) | (ctx->lvds_term_conf[CHANNEL_B] ? @@ -833,6 +850,7 @@ static int sn65dsi83_parse_lvds_endpoint(struct sn65dsi83 *ctx, int channel) u32 lvds_vod_swing_clk[2] = { 0, 1000000 }; /* Set default near end terminataion to 200 Ohm */ u32 lvds_term = 200; + u32 data_lanes[DATA_LANES_COUNT]; int lvds_vod_swing_conf; int ret_data; int ret_clock; @@ -845,6 +863,19 @@ static int sn65dsi83_parse_lvds_endpoint(struct sn65dsi83 *ctx, int channel) else return -EINVAL; + ret_data = of_property_read_u32_array(endpoint, "data-lanes", data_lanes, + ARRAY_SIZE(data_lanes)); + if (!ret_data) { + if (memcmp(data_lanes, + supported_data_lane_mapping[LANE_MAPPING_REVERSE], + ARRAY_SIZE(data_lanes)) == 0) + ctx->lvds_reverse_lanes_conf[channel] = true; + else if (memcmp(data_lanes, + supported_data_lane_mapping[LANE_MAPPING_NORMAL], + ARRAY_SIZE(data_lanes)) != 0) + return dev_err_probe(dev, -EINVAL, "invalid data lanes mapping\n"); + } + ret_data = of_property_read_u32_array(endpoint, "ti,lvds-vod-swing-data-microvolt", lvds_vod_swing_data, ARRAY_SIZE(lvds_vod_swing_data)); if (ret_data != 0 && ret_data != -EINVAL) -- 2.47.3
