| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <f28814d9-905b-1007-8550-011d49c68d5a@rock-chips.com>
Date: Wed, 7 Sep 2016 11:50:29 +0800
From: Yakir Yang <ykk@...k-chips.com>
To: Sean Paul <seanpaul@...omium.org>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>,
Inki Dae <inki.dae@...sung.com>,
Stéphane Marchesin <marcheu@...omium.org>,
Tomasz Figa <tfiga@...omium.org>,
Douglas Anderson <dianders@...omium.org>,
Thierry Reding <treding@...dia.com>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Heiko Stuebner <heiko@...ech.de>,
Jingoo Han <jingoohan1@...il.com>,
David Airlie <airlied@...ux.ie>,
Javier Martinez Canillas <javier@....samsung.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] drm/bridge: analogix_dp: detect Sink PSR state after
configuring the PSR
Sean,
Thanks for your comments.
On 09/07/2016 03:51 AM, Sean Paul wrote:
> On Fri, Aug 26, 2016 at 6:19 AM, Yakir Yang <ykk@...k-chips.com> wrote:
>> Make sure the request PSR state could effect in analogix_dp_send_psr_spd()
>> function, or printing the error Sink PSR state if we failed to effect
>> the request PSR setting.
>>
>> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
>> ---
>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 6 ++---
>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 4 ++--
>> drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 26 ++++++++++++++++++++--
>> 3 files changed, 28 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> index efac8ab..5a37de8 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
>> @@ -115,8 +115,7 @@ int analogix_dp_enable_psr(struct device *dev)
>> psr_vsc.DB0 = 0;
>> psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
>>
>> - analogix_dp_send_psr_spd(dp, &psr_vsc);
>> - return 0;
>> + return analogix_dp_send_psr_spd(dp, &psr_vsc);
>> }
>> EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
>>
>> @@ -138,8 +137,7 @@ int analogix_dp_disable_psr(struct device *dev)
>> psr_vsc.DB0 = 0;
>> psr_vsc.DB1 = 0;
>>
>> - analogix_dp_send_psr_spd(dp, &psr_vsc);
>> - return 0;
>> + return analogix_dp_send_psr_spd(dp, &psr_vsc);
>> }
>> EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
>>
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> index 473b980..f617a9d 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
>> @@ -283,7 +283,7 @@ void analogix_dp_config_video_slave_mode(struct analogix_dp_device *dp);
>> void analogix_dp_enable_scrambling(struct analogix_dp_device *dp);
>> void analogix_dp_disable_scrambling(struct analogix_dp_device *dp);
>> void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp);
>> -void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> - struct edp_vsc_psr *vsc);
>> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> + struct edp_vsc_psr *vsc);
>>
>> #endif /* _ANALOGIX_DP_CORE_H */
>> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> index 52c1b6b..505e9d8 100644
>> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
>> @@ -1328,9 +1328,11 @@ void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp)
>> writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
>> }
>>
>> -void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> - struct edp_vsc_psr *vsc)
>> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> + struct edp_vsc_psr *vsc)
>> {
>> + unsigned long timeout;
>> + unsigned char sink;
> u8
Done
>> unsigned int val;
>>
>> /* don't send info frame */
>> @@ -1372,4 +1374,24 @@ void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
>> val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> val |= IF_EN;
>> writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
>> +
>> + timeout = jiffies + msecs_to_jiffies(100);
> Pull 100 out into a #define
Done
>> + while (1) {
>> + analogix_dp_read_byte_from_dpcd(dp, DP_PSR_STATUS, &sink);
> You should be checking return value here.
Done
>> +
>> + if (vsc->DB1 && sink == DP_PSR_SINK_ACTIVE_RFB)
>> + break;
>> +
>> + if (!vsc->DB1 && sink == DP_PSR_SINK_INACTIVE)
>> + break;
>> +
>> + if (time_after(jiffies, timeout)) {
>> + dev_warn(dp->dev, "Failed to effect PSR: %x", sink);
>> + return -EBUSY;
> -ETIMEDOUT is more appropriate
Done
>> + }
>> +
>> + usleep_range(1000, 1500);
>> + }
> The while(1) loop is a little scary. I'd rather do:
>
> while (time_before(jiffies, timeout)) {
> ret = analogix_dp_read_byte_from_dpcd(dp, DP_PSR_STATUS, &sink);
> if (ret != 1) {
> DRM_DEV_ERROR(dp->dev, "PSR_STATUS read failed
> ret=%d", ret);
> return ret;
> }
>
> if (vsc->DB1 && sink == DP_PSR_SINK_ACTIVE_RFB ||
> !vsc->DB1 && sink == DP_PSR_SINK_INACTIVE)
> return 0;
>
> usleep_range(1000, 1500);
> }
>
> dev_warn(dp->dev, "Failed to effect PSR: %x", sink);
> return -ETIMEDOUT;
Thanks for your code.
- Yakir
>
>
>> +
>> + return 0;
>> }
>> --
>> 1.9.1
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
Powered by blists - more mailing lists