linux-kernel - Re: [PATCH] drm: msm: dsi: Don't attempt changing voltage of switches

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Date:	Fri, 28 Aug 2015 15:57:09 +0530
From:	Archit Taneja <architt@...eaurora.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Rob Clark <robdclark@...il.com>, Hai Li <hali@...eaurora.org>
CC:	Stephane Viau <sviau@...eaurora.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: msm: dsi: Don't attempt changing voltage of switches

Hi,

On 08/18/2015 11:04 PM, Bjorn Andersson wrote:
> In some configurations the supplies are voltage switches and not LDOs,
> making the set voltage call to fail. Check with the regulator framework
> if the supply can change voltage before attempting.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
>   drivers/gpu/drm/msm/dsi/dsi_host.c    | 2 +-
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 8c16d6a3ca78..ece3de6a8157 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -278,7 +278,7 @@ static int dsi_regulator_init(struct msm_dsi_host *msm_host)
>   	}
>
>   	for (i = 0; i < num; i++) {
> -		if ((regs[i].min_voltage >= 0) && (regs[i].max_voltage >= 0)) {
> +		if (regulator_can_change_voltage(s[i].consumer)) {
>   			ret = regulator_set_voltage(s[i].consumer,
>   				regs[i].min_voltage, regs[i].max_voltage);
>   			if (ret < 0) {
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> index 401ff58d6893..f1f955f571fa 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
> @@ -178,7 +178,7 @@ static int dsi_phy_regulator_init(struct msm_dsi_phy *phy)
>   	}
>
>   	for (i = 0; i < num; i++) {
> -		if ((regs[i].min_voltage >= 0) && (regs[i].max_voltage >= 0)) {
> +		if (regulator_can_change_voltage(s[i].consumer)) {
>   			ret = regulator_set_voltage(s[i].consumer,
>   				regs[i].min_voltage, regs[i].max_voltage);
>   			if (ret < 0) {
>

Looks good to me.

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

Archit

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