Re: [PATCH v5 01/36] drm/bridge: analogix_dp: detect Sink PSR state after configuring the PSR

Archit Taneja
2018-03-14T05:29:27Z

On Saturday 10 March 2018 03:52 AM, Enric Balletbo i Serra wrote:
> From: Yakir Yang <ykk@rock-chips.com>
>
> Make sure the request PSR state takes effect in analogix_dp_send_psr_spd()
> function, or print the sink PSR error state if we failed to apply the
> requested PSR setting.

Reviewed-by: Archit Taneja <architt@codeaurora.org>

>
> Cc: 征增 王 <wzz@rock-chips.com>
> Cc: Stéphane Marchesin <marcheu@chromium.org>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> [seanpaul changed timeout loop to a readx poll]
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 6 ++--
> drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 6 ++--
> drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 35 +++++++++++++++++++---
> 3 files changed, 37 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index a693ab3078f0..e738aa6de1af 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -122,8 +122,7 @@ int analogix_dp_enable_psr(struct analogix_dp_device *dp)
> 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);
>
> @@ -149,8 +148,7 @@ int analogix_dp_disable_psr(struct analogix_dp_device *dp)
> if (ret != 1)
> dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret);
>
> - 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 5c6a28806129..b039b28d8fcc 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
> @@ -20,6 +20,8 @@
> #define MAX_CR_LOOP 5
> #define MAX_EQ_LOOP 5
>
> +#define DP_TIMEOUT_PSR_LOOP_MS 300
> +
> /* DP_MAX_LANE_COUNT */
> #define DPCD_ENHANCED_FRAME_CAP(x) (((x) >> 7) & 0x1)
> #define DPCD_MAX_LANE_COUNT(x) ((x) & 0x1f)
> @@ -247,8 +249,8 @@ 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);
> ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
> struct drm_dp_aux_msg *msg);
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 303083ad28e3..005a3f7005d2 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -10,10 +10,11 @@
> * option) any later version.
> */
>
> -#include <linux/device.h>
> -#include <linux/io.h>
> #include <linux/delay.h>
> +#include <linux/device.h>
> #include <linux/gpio.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
>
> #include <drm/bridge/analogix_dp.h>
>
> @@ -992,10 +993,25 @@ 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)
> +static ssize_t analogix_dp_get_psr_status(struct analogix_dp_device *dp)
> +{
> + ssize_t val;
> + u8 status;
> +
> + val = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &status);
> + if (val < 0) {
> + dev_err(dp->dev, "PSR_STATUS read failed ret=%zd", val);
> + return val;
> + }
> + return status;
> +}
> +
> +int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
> + struct edp_vsc_psr *vsc)
> {
> unsigned int val;
> + int ret;
> + ssize_t psr_status;
>
> /* don't send info frame */
> val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
> @@ -1036,6 +1052,17 @@ 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);
> +
> + ret = readx_poll_timeout(analogix_dp_get_psr_status, dp, psr_status,
> + psr_status >= 0 &&
> + ((vsc->DB1 && psr_status == DP_PSR_SINK_ACTIVE_RFB) ||
> + (!vsc->DB1 && psr_status == DP_PSR_SINK_INACTIVE)), 1500,
> + DP_TIMEOUT_PSR_LOOP_MS * 1000);
> + if (ret) {
> + dev_warn(dp->dev, "Failed to apply PSR %d\n", ret);
> + return ret;
> + }
> + return 0;
> }
>
> ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>
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