linux-kernel - Re: [PATCH v3 3/5] drm/rockchip/dsi: remove mode_valid function

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Date:   Tue, 24 Jan 2017 10:27:27 +0800
From:   Chris Zhong <zyw@...k-chips.com>
To:     Sean Paul <seanpaul@...omium.org>
Cc:     dianders@...omium.org, tfiga@...omium.org, heiko@...ech.de,
        yzq@...k-chips.com, mark.rutland@....com,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        galak@...eaurora.org, pawel.moll@....com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/5] drm/rockchip/dsi: remove mode_valid function

Hi Sean

On 01/24/2017 01:48 AM, Sean Paul wrote:
> On Fri, Jan 20, 2017 at 06:10:49PM +0800, Chris Zhong wrote:
>> The MIPI DSI do not need check the validity of resolution, the max
>> resolution should depend VOP. Hence, remove rk3288_mipi_dsi_mode_valid
>> here.
> Does vop actually enforce this, though? I see that mode_config.max_width is
> 4096, but there is no bounds checking in mode_fixup().
>
> The connector is currently rejecting everything greater than 2047. So I think
> you're going to regress behavior here.
>
> Sean
The mipi controller has not this width limit, it depend the VOP, such as 
RK3399, VOP_LIT only support 2560,
but VOP_BIG support 4K. So this driver should check the width here.

>
>
>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>> ---
>>
>> Changes in v3: None
>>
>>   drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 39 ----------------------------------
>>   1 file changed, 39 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> index a93ce97..6f0e252 100644
>> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> @@ -278,8 +278,6 @@ struct dw_mipi_dsi_plat_data {
>>   	u32 grf_dsi0_mode;
>>   	u32 grf_dsi0_mode_reg;
>>   	unsigned int max_data_lanes;
>> -	enum drm_mode_status (*mode_valid)(struct drm_connector *connector,
>> -					   struct drm_display_mode *mode);
>>   };
>>   
>>   struct dw_mipi_dsi {
>> @@ -1081,23 +1079,8 @@ static int dw_mipi_dsi_connector_get_modes(struct drm_connector *connector)
>>   	return drm_panel_get_modes(dsi->panel);
>>   }
>>   
>> -static enum drm_mode_status dw_mipi_dsi_mode_valid(
>> -					struct drm_connector *connector,
>> -					struct drm_display_mode *mode)
>> -{
>> -	struct dw_mipi_dsi *dsi = con_to_dsi(connector);
>> -
>> -	enum drm_mode_status mode_status = MODE_OK;
>> -
>> -	if (dsi->pdata->mode_valid)
>> -		mode_status = dsi->pdata->mode_valid(connector, mode);
>> -
>> -	return mode_status;
>> -}
>> -
>>   static struct drm_connector_helper_funcs dw_mipi_dsi_connector_helper_funcs = {
>>   	.get_modes = dw_mipi_dsi_connector_get_modes,
>> -	.mode_valid = dw_mipi_dsi_mode_valid,
>>   };
>>   
>>   static void dw_mipi_dsi_drm_connector_destroy(struct drm_connector *connector)
>> @@ -1168,33 +1151,11 @@ static int rockchip_mipi_parse_dt(struct dw_mipi_dsi *dsi)
>>   	return 0;
>>   }
>>   
>> -static enum drm_mode_status rk3288_mipi_dsi_mode_valid(
>> -					struct drm_connector *connector,
>> -					struct drm_display_mode *mode)
>> -{
>> -	/*
>> -	 * The VID_PKT_SIZE field in the DSI_VID_PKT_CFG
>> -	 * register is 11-bit.
>> -	 */
>> -	if (mode->hdisplay > 0x7ff)
>> -		return MODE_BAD_HVALUE;
>> -
>> -	/*
>> -	 * The V_ACTIVE_LINES field in the DSI_VTIMING_CFG
>> -	 * register is 11-bit.
>> -	 */
>> -	if (mode->vdisplay > 0x7ff)
>> -		return MODE_BAD_VVALUE;
>> -
>> -	return MODE_OK;
>> -}
>> -
>>   static struct dw_mipi_dsi_plat_data rk3288_mipi_dsi_drv_data = {
>>   	.dsi0_en_bit = RK3288_DSI0_SEL_VOP_LIT,
>>   	.dsi1_en_bit = RK3288_DSI1_SEL_VOP_LIT,
>>   	.grf_switch_reg = RK3288_GRF_SOC_CON6,
>>   	.max_data_lanes = 4,
>> -	.mode_valid = rk3288_mipi_dsi_mode_valid,
>>   };
>>   
>>   static struct dw_mipi_dsi_plat_data rk3399_mipi_dsi_drv_data = {
>> -- 
>> 2.6.3
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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