diff options
| author | Kuogee Hsieh <quic_khsieh@quicinc.com> | 2022-12-27 09:45:02 -0800 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2023-01-09 03:06:44 +0200 |
| commit | 381518a1677c49742a85f51e8f0e89f4b9b7d297 (patch) | |
| tree | 708f6aa52ebb0c102eafcc8952ccc94f980e458e /drivers/gpu/drm/msm/dp/dp_parser.c | |
| parent | d25cfeeec06482f2487d612f36890b57ef1aad3c (diff) | |
drm/msm/dp: Add capability to parser and retrieve max DP link supported rate from link-frequencies property of dp_out endpoint
Changes in v6:
-- second patch after split parser patch into two patches
Changes in v7:
-- without checking cnt against DP_MAX_NUM_DP_LANES to retrieve link rate
Changes in v9:
-- separate parser link-frequencies out of data-lanes
Changes in v10:
-- add dp_parser_link_frequencies()
Changes in v11:
-- return 0 if(!endpoint)
Changes in v12:
-- replace khz with kbytes at dp_parser.h
Changes in v14:
-- replace "parser" with "parse" at commit subject
-- use do_div() for 64 bits division
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/516100/
Link: https://lore.kernel.org/r/1672163103-31254-5-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Diffstat (limited to 'drivers/gpu/drm/msm/dp/dp_parser.c')
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_parser.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c index 169023edb358..7032dcc8842b 100644 --- a/drivers/gpu/drm/msm/dp/dp_parser.c +++ b/drivers/gpu/drm/msm/dp/dp_parser.c @@ -91,6 +91,30 @@ static int dp_parser_ctrl_res(struct dp_parser *parser) return 0; } +static u32 dp_parser_link_frequencies(struct device_node *of_node) +{ + struct device_node *endpoint; + u64 frequency = 0; + int cnt; + + endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */ + if (!endpoint) + return 0; + + cnt = of_property_count_u64_elems(endpoint, "link-frequencies"); + + if (cnt > 0) + of_property_read_u64_index(endpoint, "link-frequencies", + cnt - 1, &frequency); + of_node_put(endpoint); + + do_div(frequency, + 10 * /* from symbol rate to link rate */ + 1000); /* kbytes */ + + return frequency; +} + static int dp_parser_misc(struct dp_parser *parser) { struct device_node *of_node = parser->pdev->dev.of_node; @@ -110,6 +134,10 @@ static int dp_parser_misc(struct dp_parser *parser) else parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */ + parser->max_dp_link_rate = dp_parser_link_frequencies(of_node); + if (!parser->max_dp_link_rate) + parser->max_dp_link_rate = DP_LINK_RATE_HBR2; + return 0; } |