Re: [PATCH] drm/omap: add OMAP5 DSIPHY lane-enable support

Tomi Valkeinen <tomi.valkeinen@xxxxxx> · Thu, 10 Aug 2017 11:28:44 +0300

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Subject: Re: [PATCH] drm/omap: add OMAP5 DSIPHY lane-enable support
From: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Date: Thu, 10 Aug 2017 11:28:44 +0300
Cc: <dri-devel@xxxxxxxxxxxxxxxxxxxxx>, "H . Nikolaus Schaller"	<hns@xxxxxxxxxxxxx>, <linux-omap@xxxxxxxxxxxxxxx>
In-reply-to: <1545191.ArXLlpMNYh@avalon>
References: <1502347520-27306-1-git-send-email-tomi.valkeinen@ti.com> <1545191.ArXLlpMNYh@avalon>
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Hi,

On 10/08/17 10:22, Laurent Pinchart wrote:
> Hi Tomi,
> 
> Thank you for the patch.
> 
> On Thursday 10 Aug 2017 09:45:20 Tomi Valkeinen wrote:
>> We are missing OMAP5 DSIPHY lane-enable support, which has prevented
>> OMAP5 DSI working in mainline. This patch adds the lane-enable similarly
>> to the recently added OMAP4 version.
>>
>> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
>> ---
>>
>> Based on Laurent's recent omapdrm series.
>>
>>  drivers/gpu/drm/omapdrm/dss/dsi.c | 50 +++++++++++++++++++++++++++++++----
>>  1 file changed, 45 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c
>> b/drivers/gpu/drm/omapdrm/dss/dsi.c index a66d2b1a6c74..1f0b29af9b86 100644
>> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
>> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
>> @@ -2139,14 +2139,51 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi,
>> unsigned int lanes) return 0;
>>  }
>>
>> +#define OMAP5_DSIPHY_SYSCON_OFFSET	0x74
>> +
>> +#define OMAP5_DSI1_LANEENABLE_SHIFT	24
>> +#define OMAP5_DSI2_LANEENABLE_SHIFT	19
>> +#define OMAP5_DSI_LANEENABLE_MASK	0x1f
>> +
>> +static int dsi_omap5_mux_pads(struct dsi_data *dsi, unsigned int lanes)
>> +{
>> +	u32 enable_mask, enable_shift, reg;
>> +
>> +	if (!dsi->syscon)
>> +		return 0;
> 
> The purpose of this check in dsi_omap4_mux_pads() was to handle the SoCs that 
> don't require any driver action to mux the DSI pins. Now that 
> dsi_enable_pads() and dsi_disable_pads() have new SoC checks, this isn't 
> needed anymore, dsi->syscon can't be NULL on OMAP4 or OMAP5.

True, I'll drop the check.

>> +	if (dsi->module_id == 0)
>> +		enable_shift = OMAP5_DSI1_LANEENABLE_SHIFT;
>> +	else if (dsi->module_id == 1)
>> +		enable_shift = OMAP5_DSI2_LANEENABLE_SHIFT;
>> +	else
>> +		return -ENODEV;
>> +
>> +	enable_mask = OMAP5_DSI_LANEENABLE_MASK << enable_shift;
>> +
>> +	regmap_read(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET, &reg);
>> +	reg &= ~enable_mask;
>> +	reg |= (lanes << enable_shift) & enable_mask;
>> +	regmap_write(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET, reg);
>> +
>> +	return 0;
>> +}
>> +
>>  static int dsi_enable_pads(struct dsi_data *dsi, unsigned int lane_mask)
>>  {
>> -	return dsi_omap4_mux_pads(dsi, lane_mask);
>> +	if (dsi->data->model == DSI_MODEL_OMAP4)
>> +		return dsi_omap4_mux_pads(dsi, lane_mask);
>> +	if (dsi->data->model == DSI_MODEL_OMAP5)
>> +		return dsi_omap5_mux_pads(dsi, lane_mask);
>> +	return 0;
>>  }
>>
>>  static void dsi_disable_pads(struct dsi_data *dsi)
>>  {
>> -	dsi_omap4_mux_pads(dsi, 0);
>> +	if (dsi->data->model == DSI_MODEL_OMAP4)
>> +		dsi_omap4_mux_pads(dsi, 0);
>> +	if (dsi->data->model == DSI_MODEL_OMAP4)
> 
> Did you mean DSI_MODEL_OMAP5 ? As the two are mutually exclusive, I would use 
> an "else if".

Indeed, it should be OMAP5.

 Tomi

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