On Thu, Feb 17, 2022 at 01:25:22AM +0100, Marek Vasut wrote:
> The driver currently hard-codes DSI lane count to two, however the chip
> is capable of operating in 1..4 DSI lanes mode. Parse 'data-lanes' DT
> property and program the result into DSI_CTRL register.
>
> Signed-off-by: Marek Vasut <marex@xxxxxxx>
> Cc: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
> Cc: Maxime Ripard <maxime@xxxxxxxxxx>
> Cc: Robert Foss <robert.foss@xxxxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> To: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> ---
> V2: Rebase on next-20220214
> ---
> drivers/gpu/drm/bridge/chipone-icn6211.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c
> index 2ac8eb7e25f52..7c013a08c7b00 100644
> --- a/drivers/gpu/drm/bridge/chipone-icn6211.c
> +++ b/drivers/gpu/drm/bridge/chipone-icn6211.c
> @@ -136,10 +136,12 @@ struct chipone {
> struct drm_bridge bridge;
> struct drm_display_mode mode;
> struct drm_bridge *panel_bridge;
> + struct device_node *host_node;
> struct gpio_desc *enable_gpio;
> struct regulator *vdd1;
> struct regulator *vdd2;
> struct regulator *vdd3;
> + int dsi_lanes;
> };
>
> static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
> @@ -212,6 +214,11 @@ static void chipone_atomic_enable(struct drm_bridge *bridge,
> /* dsi specific sequence */
> ICN6211_DSI(icn, SYNC_EVENT_DLY, 0x80);
> ICN6211_DSI(icn, HFP_MIN, hfp & 0xff);
> +
> + /* DSI data lane count */
> + ICN6211_DSI(icn, DSI_CTRL,
> + DSI_CTRL_UNKNOWN | DSI_CTRL_DSI_LANES(icn->dsi_lanes - 1));
> +
> ICN6211_DSI(icn, MIPI_PD_CK_LANE, 0xa0);
> ICN6211_DSI(icn, PLL_CTRL(12), 0xff);
>
> @@ -314,6 +321,7 @@ static const struct drm_bridge_funcs chipone_bridge_funcs = {
> static int chipone_parse_dt(struct chipone *icn)
> {
> struct device *dev = icn->dev;
> + struct device_node *endpoint;
> struct drm_panel *panel;
> int ret;
>
> @@ -350,6 +358,16 @@ static int chipone_parse_dt(struct chipone *icn)
> return PTR_ERR(icn->enable_gpio);
> }
>
> + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
> + icn->dsi_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
The binding must be amended to allow for the usage of data-lanes, and
you need to keep the previous value as default for older device trees
Maxime
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