Hi Brain,
On 11/03/2015 12:38 PM, Brian Norris wrote:
Hi Yakir,
On Thu, Oct 29, 2015 at 09:58:38AM +0800, Yakir Yang wrote:
Add phy driver for the Rockchip DisplayPort PHY module. This is required to get DisplayPort working in Rockchip SoCs.
Reviewed-by: Heiko Stuebnerheiko@sntech.de Signed-off-by: Yakir Yangykk@rock-chips.com
...
diff --git a/drivers/phy/phy-rockchip-dp.c b/drivers/phy/phy-rockchip-dp.c new file mode 100644 index 0000000..f3e0058 --- /dev/null +++ b/drivers/phy/phy-rockchip-dp.c @@ -0,0 +1,151 @@ +/*
- Rockchip DP PHY driver
- Copyright (C) 2015 FuZhou Rockchip Co., Ltd.
- Author: Yakir Yang<ykk@@rock-chips.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License.
- */
+#include <linux/module.h> +#include <linux/of.h> +#include <linux/clk.h> +#include <linux/phy/phy.h> +#include <linux/regmap.h> +#include <linux/mfd/syscon.h> +#include <linux/platform_device.h>
+#define GRF_SOC_CON12 0x0274
+#define GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK BIT(4) +#define GRF_EDP_REF_CLK_SEL_INTER BIT(4)
Why are the above two macros the same? Judging by the RK3288 manual and other downstream drivers, it seems like you want the _MASK one to be shifted left by 16 (i.e., BIT(20)).
Oops, yes, you're right, it should be BIT(20), thanks for the catch.
+#define GRF_EDP_PHY_SIDDQ_HIWORD_MASK BIT(21) +#define GRF_EDP_PHY_SIDDQ_ON 0 +#define GRF_EDP_PHY_SIDDQ_OFF BIT(5)
...
- ret = regmap_write(dp->grf, GRF_SOC_CON12, GRF_EDP_REF_CLK_SEL_INTER |
GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK);IOW, the above is writing:
BIT(4) | BIT(4)
whereas I think you want:
BIT(4) | BIT(20)
- if (ret != 0) {
dev_err(dp->dev, "Could not config GRF edp ref clk: %d\n", ret);return ret;- }
...
(FYI, I came across this by inspection when comparing Heiko's 'somewhat-stable' branch [1] with this series. The former brings up eDP fine on veyron-jaq, whereas this one doesn't yet, even with the above change. Still debugging the issue.)
Hmm... I'm not sure whether your eDP screen have the hotplug signal, so I think you can try to add "analogix,force-hpd" flag into rk3288-veyron-jaq.dts
&edp { analogix,need-force-hpd; }
If that changes couldn't fix the problem, guess you may need max the panel power up delay time which pointed by Heiko. Like:
Thanks, - Yakir
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index 4fa5f69..546a506 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -82,6 +82,13 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp) */ dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n");
+ /* + * Hotplug signal would indicate the right time to operate + * panel after poweron, but if the hotplug is missing, then + * panel would need wait hundreds of milliseconds at here. + */ + mdelay(100); + analogix_dp_force_hpd(dp);
if (analogix_dp_get_plug_in_status(dp) != 0) {
Brian
[1]https://github.com/mmind/linux-rockchip/tree/devel/somewhat-stable