Add a helper to get ExtDst source selection. This is needed by disabling CRTC at boot in an upcoming commit which tries to get the source selection.
Reviewed-by: Frank Li <[email protected]> Acked-by: Maxime Ripard <[email protected]> Reviewed-by: Alexander Stein <[email protected]> Signed-off-by: Liu Ying <[email protected]> --- v8: - Collect Alexander's R-b tag. - Fix dc_ed_pec_src_sel_get()'s return value when regmap_read() fails. (Alexander) - Iterate over src_sels[] to find the source selection. (Sashiko AI bot) v7: - Collect Maxime's A-b tag. - Check regmap_read()'s return valure. (Sashiko AI bot) v2: - Collect Frank's R-b tag. --- drivers/gpu/drm/imx/dc/dc-ed.c | 21 +++++++++++++++++++++ drivers/gpu/drm/imx/dc/dc-pe.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/imx/dc/dc-ed.c b/drivers/gpu/drm/imx/dc/dc-ed.c index de1b71315eab..a4a21d0affb6 100644 --- a/drivers/gpu/drm/imx/dc/dc-ed.c +++ b/drivers/gpu/drm/imx/dc/dc-ed.c @@ -149,6 +149,27 @@ void dc_ed_pec_src_sel(struct dc_ed *ed, enum dc_link_id src) } } +int dc_ed_pec_src_sel_get(struct dc_ed *ed, enum dc_link_id *src) +{ + u32 val; + int ret; + int i; + + ret = regmap_read(ed->reg_pec, PIXENGCFG_DYNAMIC, &val); + if (ret) + return ret; + + for (i = 0; i < ARRAY_SIZE(src_sels); i++) { + if (src_sels[i] == val) { + dev_dbg(ed->dev, "get source selection: 0x%02x\n", val); + *src = val; + return 0; + } + } + + return -EINVAL; +} + void dc_ed_pec_sync_trigger(struct dc_ed *ed) { regmap_write(ed->reg_pec, PIXENGCFG_TRIGGER, SYNC_TRIGGER); diff --git a/drivers/gpu/drm/imx/dc/dc-pe.h b/drivers/gpu/drm/imx/dc/dc-pe.h index f5e01a6eb9e9..0b81dc6b251c 100644 --- a/drivers/gpu/drm/imx/dc/dc-pe.h +++ b/drivers/gpu/drm/imx/dc/dc-pe.h @@ -85,6 +85,7 @@ void dc_cf_init(struct dc_cf *cf); /* External Destination Unit */ void dc_ed_pec_src_sel(struct dc_ed *ed, enum dc_link_id src); +int dc_ed_pec_src_sel_get(struct dc_ed *ed, enum dc_link_id *src); void dc_ed_pec_sync_trigger(struct dc_ed *ed); void dc_ed_init(struct dc_ed *ed); -- 2.43.0
