Hi Laurent, Tomi,
On 14/03/22 17:07, Devarsh Thakkar wrote:
> Soft reset the display subsystem controller on startup and wait for
> the reset to complete. This helps the scenario where display was
> already in use by some other core before the linux was booted.
Could you please help review this patch ?
Regards,
Devarsh
> Signed-off-by: Devarsh Thakkar <devarsht@xxxxxx>
> ---
> drivers/gpu/drm/tidss/tidss_dispc.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
> index 60b92df615aa..dae47853b728 100644
> --- a/drivers/gpu/drm/tidss/tidss_dispc.c
> +++ b/drivers/gpu/drm/tidss/tidss_dispc.c
> @@ -2650,6 +2650,20 @@ static void dispc_init_errata(struct dispc_device *dispc)
> }
> }
>
> +static void dispc_softreset(struct dispc_device *dispc)
> +{
> + u32 val;
> + int ret = 0;
> +
> + /* Soft reset */
> + REG_FLD_MOD(dispc, DSS_SYSCONFIG, 1, 1, 1);
> + /* Wait for reset to complete */
> + ret = readl_poll_timeout(dispc->base_common + DSS_SYSSTATUS,
> + val, val & 1, 100, 5000);
> + if (ret)
> + dev_warn(dispc->dev, "failed to reset dispc\n");
> +}
> +
> int dispc_init(struct tidss_device *tidss)
> {
> struct device *dev = tidss->dev;
> @@ -2709,6 +2723,10 @@ int dispc_init(struct tidss_device *tidss)
> return r;
> }
>
> + /* K2G display controller does not support soft reset */
> + if (feat->subrev != DISPC_K2G)
> + dispc_softreset(dispc);
> +
> for (i = 0; i < dispc->feat->num_vps; i++) {
> u32 gamma_size = dispc->feat->vp_feat.color.gamma_size;
> u32 *gamma_table;
