| Message ID | 1670539015-11808-5-git-send-email-quic_khsieh@quicinc.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add data-lanes and link-frequencies to dp_out endpoint | expand |
On 09/12/2022 00:36, Kuogee Hsieh wrote: > 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) > > Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> > --- > drivers/gpu/drm/msm/dp/dp_parser.c | 27 +++++++++++++++++++++++++++ > drivers/gpu/drm/msm/dp/dp_parser.h | 2 ++ > 2 files changed, 29 insertions(+) > > diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c > index b5f7e70..9a7dcd4 100644 > --- a/drivers/gpu/drm/msm/dp/dp_parser.c > +++ b/drivers/gpu/drm/msm/dp/dp_parser.c > @@ -91,6 +91,29 @@ 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 = 0; > + > + 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); > + > + frequency /= 10; /* from symbol rate to link rate */ > + frequency /= 1000; /* kbytes */ > + > + return frequency; > +} > + > static int dp_parser_misc(struct dp_parser *parser) > { > struct device_node *of_node = parser->pdev->dev.of_node; > @@ -113,6 +136,10 @@ static int dp_parser_misc(struct dp_parser *parser) > 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; /* 540000 khz */ Drop the comment please. One can jump to the defined value to see what is it equal to. So it adds no information. > + > return 0; > } > > diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h > index 866c1a8..6b10c3e 100644 > --- a/drivers/gpu/drm/msm/dp/dp_parser.h > +++ b/drivers/gpu/drm/msm/dp/dp_parser.h > @@ -15,6 +15,7 @@ > #define DP_LABEL "MDSS DP DISPLAY" > #define DP_MAX_PIXEL_CLK_KHZ 675000 > #define DP_MAX_NUM_DP_LANES 4 > +#define DP_LINK_RATE_HBR2 540000 /* khz */ kbytes, not kHz. Otherwise it would have been 5400000. > > enum dp_pm_type { > DP_CORE_PM, > @@ -119,6 +120,7 @@ struct dp_parser { > struct dp_io io; > struct dp_display_data disp_data; > u32 max_dp_lanes; > + u32 max_dp_link_rate; > struct drm_bridge *next_bridge; > > int (*parse)(struct dp_parser *parser);
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c index b5f7e70..9a7dcd4 100644 --- a/drivers/gpu/drm/msm/dp/dp_parser.c +++ b/drivers/gpu/drm/msm/dp/dp_parser.c @@ -91,6 +91,29 @@ 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 = 0; + + 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); + + frequency /= 10; /* from symbol rate to link rate */ + frequency /= 1000; /* kbytes */ + + return frequency; +} + static int dp_parser_misc(struct dp_parser *parser) { struct device_node *of_node = parser->pdev->dev.of_node; @@ -113,6 +136,10 @@ static int dp_parser_misc(struct dp_parser *parser) 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; /* 540000 khz */ + return 0; } diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h index 866c1a8..6b10c3e 100644 --- a/drivers/gpu/drm/msm/dp/dp_parser.h +++ b/drivers/gpu/drm/msm/dp/dp_parser.h @@ -15,6 +15,7 @@ #define DP_LABEL "MDSS DP DISPLAY" #define DP_MAX_PIXEL_CLK_KHZ 675000 #define DP_MAX_NUM_DP_LANES 4 +#define DP_LINK_RATE_HBR2 540000 /* khz */ enum dp_pm_type { DP_CORE_PM, @@ -119,6 +120,7 @@ struct dp_parser { struct dp_io io; struct dp_display_data disp_data; u32 max_dp_lanes; + u32 max_dp_link_rate; struct drm_bridge *next_bridge; int (*parse)(struct dp_parser *parser);
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) Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> --- drivers/gpu/drm/msm/dp/dp_parser.c | 27 +++++++++++++++++++++++++++ drivers/gpu/drm/msm/dp/dp_parser.h | 2 ++ 2 files changed, 29 insertions(+)