Re: [PATCHv2] drm/omap: add OMAP5 DSIPHY lane-enable support

Laurent Pinchart
2017-08-10T10:31:12Z

Hi Tomi,

Thank you for the patch.

On Thursday 10 Aug 2017 12:44:01 Tomi Valkeinen wrote:
> We are missing OMAP5 DSIPHY lane-enable support, which has prevented
> OMAP5 DSI working in mainline. This patch adds the lane-enable similarly
> to the recently added OMAP4 version.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
>
> Changes:
>
> - Fixed the check for DSI model
> - Use else if
> - Drop the unnecessary syscon check
>
> drivers/gpu/drm/omapdrm/dss/dsi.c | 50 +++++++++++++++++++++++++++++-------
> 1 file changed, 42 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c
> b/drivers/gpu/drm/omapdrm/dss/dsi.c index a66d2b1a6c74..889f2d30050b 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -2109,9 +2109,6 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi,
> unsigned int lanes) u32 pipd_mask, pipd_shift;
> u32 reg;
>
> - if (!dsi->syscon)
> - return 0;
> -
> if (dsi->module_id == 0) {
> enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
> enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
> @@ -2139,14 +2136,48 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi,
> unsigned int lanes) return 0;
> }
>
> +#define OMAP5_DSIPHY_SYSCON_OFFSET 0x74
> +
> +#define OMAP5_DSI1_LANEENABLE_SHIFT 24
> +#define OMAP5_DSI2_LANEENABLE_SHIFT 19
> +#define OMAP5_DSI_LANEENABLE_MASK 0x1f
> +
> +static int dsi_omap5_mux_pads(struct dsi_data *dsi, unsigned int lanes)
> +{
> + u32 enable_mask, enable_shift, reg;
> +
> + if (dsi->module_id == 0)
> + enable_shift = OMAP5_DSI1_LANEENABLE_SHIFT;
> + else if (dsi->module_id == 1)
> + enable_shift = OMAP5_DSI2_LANEENABLE_SHIFT;
> + else
> + return -ENODEV;
> +
> + enable_mask = OMAP5_DSI_LANEENABLE_MASK << enable_shift;
> +
> + regmap_read(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET, &reg);
> + reg &= ~enable_mask;
> + reg |= (lanes << enable_shift) & enable_mask;
> + regmap_write(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET, reg);

I should have spot that during the first review, but I think
regmap_update_bits() would be more efficient, and would also benefit from
internal regmap locking.

Apart from that,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +
> + return 0;
> +}
> +
> static int dsi_enable_pads(struct dsi_data *dsi, unsigned int lane_mask)
> {
> - return dsi_omap4_mux_pads(dsi, lane_mask);
> + if (dsi->data->model == DSI_MODEL_OMAP4)
> + return dsi_omap4_mux_pads(dsi, lane_mask);
> + if (dsi->data->model == DSI_MODEL_OMAP5)
> + return dsi_omap5_mux_pads(dsi, lane_mask);
> + return 0;
> }
>
> static void dsi_disable_pads(struct dsi_data *dsi)
> {
> - dsi_omap4_mux_pads(dsi, 0);
> + if (dsi->data->model == DSI_MODEL_OMAP4)
> + dsi_omap4_mux_pads(dsi, 0);
> + else if (dsi->data->model == DSI_MODEL_OMAP5)
> + dsi_omap5_mux_pads(dsi, 0);
> }
>
> static int dsi_cio_init(struct platform_device *dsidev)
> @@ -5480,14 +5511,17 @@ static int dsi_bind(struct device *dev, struct
> device *master, void *data)
>
> dsi->module_id = d->id;
>
> - if (dsi->data->model == DSI_MODEL_OMAP4) {
> + if (dsi->data->model == DSI_MODEL_OMAP4 ||
> + dsi->data->model == DSI_MODEL_OMAP5) {
> struct device_node *np;
>
> /*
> - * The OMAP4 display DT bindings don't reference the padconf
> + * The OMAP4/5 display DT bindings don't reference the padconf
> * syscon. Our only option to retrieve it is to find it by
name.
> */
> - np = of_find_node_by_name(NULL, "omap4_padconf_global");
> + np = of_find_node_by_name(NULL,
> + dsi->data->model == DSI_MODEL_OMAP4 ?
> + "omap4_padconf_global" : "omap5_padconf_global");
> if (!np)
> return -ENODEV;

--
Regards,

Laurent Pinchart