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Date: Thu, 20 Aug 2015 03:04:30 -0500
From: Yakir Yang <ykk@...k-chips.com>
To: Jingoo Han <jingoohan1@...il.com>
CC: Heiko Stuebner <heiko@...ech.de>,
Thierry Reding <treding@...dia.com>,
Fabio Estevam <fabio.estevam@...escale.com>,
Inki Dae <inki.dae@...sung.com>,
"joe@...ches.com" <joe@...ches.com>,
Russell King <rmk+kernel@....linux.org.uk>,
"djkurtz@...gle.com" <djkurtz@...gle.com>,
"dianders@...gle.com" <dianders@...gle.com>,
"seanpaul@...gle.com" <seanpaul@...gle.com>,
Takashi Iwai <tiwai@...e.de>,
"ajaynumb@...il.com" <ajaynumb@...il.com>,
Andrzej Hajda <a.hajda@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
David Airlie <airlied@...ux.ie>,
Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
Vincent Palatin <vpalatin@...omium.org>,
Mark Yao <mark.yao@...k-chips.com>,
Andy Yan <andy.yan@...k-chips.com>,
Kumar Gala <galak@...eaurora.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Kishon Vijay Abraham I <kishon@...com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"linux-rockchip@...ts.infradead.org"
<linux-rockchip@...ts.infradead.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 05/14] drm: bridge/analogix_dp: fix link_rate & lane_count
bug
Hi Jingoo,
On 08/20/2015 02:22 AM, Jingoo Han wrote:
> On 2015. 8. 19., at PM 11:50, Yakir Yang <ykk@...k-chips.com> wrote:
>> link_rate and lane_count already configed in analogix_dp_set_link_train(),
> s/configed/configured
>
> Also, the commit name such as "fix ... bug" is not good.
> How about following?
>
> drm: bridge/analogix_dp: remove duplicate configuration of link rate and link count
Thanks, done, it's more readable.
- Yakir
> Best regards,
> Jingoo Han
>
>> so we don't need to config those repeatly after training finished, just
>> remove them out.
>>
>> Beside Display Port 1.2 already support 5.4Gbps link rate, the maximum sets
>> would change from {1.62Gbps, 2.7Gbps} to {1.62Gbps, 2.7Gbps, 5.4Gbps}.
>>
>> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
>> ---
>> Changes in v3:
>> - Take Thierry Reding suggest, link_rate and lane_count shouldn't config to
>> the DT property value directly, but we can take those as hardware limite.
>> For example, RK3288 only support 4 physical lanes of 2.7/1.62 Gbps/lane,
>> so DT property would like "link-rate = 0x0a" "lane-count = 4".
>>
>> Changes in v2: None
>>
>> drivers/gpu/drm/bridge/analogix_dp_core.c | 16 ++++++++--------
>> drivers/gpu/drm/bridge/analogix_dp_core.h | 9 +++++----
>> 2 files changed, 13 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix_dp_core.c
>> index 480cc13..1778e0a 100644
>> --- a/drivers/gpu/drm/bridge/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix_dp_core.c
>> @@ -635,6 +635,8 @@ static void analogix_dp_get_max_rx_bandwidth(struct analogix_dp_device *dp,
>> /*
>> * For DP rev.1.1, Maximum link rate of Main Link lanes
>> * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
>> + * For DP rev.1.2, Maximum link rate of Main Link lanes
>> + * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps
>> */
>> analogix_dp_read_byte_from_dpcd(dp, DP_MAX_LINK_RATE, &data);
>> *bandwidth = data;
>> @@ -668,7 +670,8 @@ static void analogix_dp_init_training(struct analogix_dp_device *dp,
>> analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
>>
>> if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
>> - (dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
>> + (dp->link_train.link_rate != LINK_RATE_2_70GBPS) &&
>> + (dp->link_train.link_rate != LINK_RATE_5_40GBPS)) {
>> dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
>> dp->link_train.link_rate);
>> dp->link_train.link_rate = LINK_RATE_1_62GBPS;
>> @@ -901,8 +904,8 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>> return;
>> }
>>
>> - ret = analogix_dp_set_link_train(dp, dp->video_info->lane_count,
>> - dp->video_info->link_rate);
>> + ret = analogix_dp_set_link_train(dp, dp->video_info->max_lane_count,
>> + dp->video_info->max_link_rate);
>> if (ret) {
>> dev_err(dp->dev, "unable to do link train\n");
>> return;
>> @@ -912,9 +915,6 @@ static void analogix_dp_commit(struct analogix_dp_device *dp)
>> analogix_dp_enable_rx_to_enhanced_mode(dp, 1);
>> analogix_dp_enable_enhanced_mode(dp, 1);
>>
>> - analogix_dp_set_lane_count(dp, dp->video_info->lane_count);
>> - analogix_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
>> -
>> analogix_dp_init_video(dp);
>> ret = analogix_dp_config_video(dp);
>> if (ret)
>> @@ -1198,13 +1198,13 @@ static struct video_info *analogix_dp_dt_parse_pdata(struct device *dev)
>> }
>>
>> if (of_property_read_u32(dp_node, "analogix,link-rate",
>> - &dp_video_config->link_rate)) {
>> + &dp_video_config->max_link_rate)) {
>> dev_err(dev, "failed to get link-rate\n");
>> return ERR_PTR(-EINVAL);
>> }
>>
>> if (of_property_read_u32(dp_node, "analogix,lane-count",
>> - &dp_video_config->lane_count)) {
>> + &dp_video_config->max_lane_count)) {
>> dev_err(dev, "failed to get lane-count\n");
>> return ERR_PTR(-EINVAL);
>> }
>> diff --git a/drivers/gpu/drm/bridge/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix_dp_core.h
>> index 2cefde9..941b34f 100644
>> --- a/drivers/gpu/drm/bridge/analogix_dp_core.h
>> +++ b/drivers/gpu/drm/bridge/analogix_dp_core.h
>> @@ -21,8 +21,9 @@
>> #define MAX_EQ_LOOP 5
>>
>> enum link_rate_type {
>> - LINK_RATE_1_62GBPS = 0x06,
>> - LINK_RATE_2_70GBPS = 0x0a
>> + LINK_RATE_1_62GBPS = DP_LINK_BW_1_62,
>> + LINK_RATE_2_70GBPS = DP_LINK_BW_2_7,
>> + LINK_RATE_5_40GBPS = DP_LINK_BW_5_4,
>> };
>>
>> enum link_lane_count_type {
>> @@ -128,8 +129,8 @@ struct video_info {
>> enum color_coefficient ycbcr_coeff;
>> enum color_depth color_depth;
>>
>> - enum link_rate_type link_rate;
>> - enum link_lane_count_type lane_count;
>> + enum link_rate_type max_link_rate;
>> + enum link_lane_count_type max_lane_count;
>> };
>>
>> struct link_train {
>> --
>> 1.9.1
>>
>>
>
>
--
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