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

From: Sean Paul <seanpaul@chromium.org>
To: Chris Zhong <zyw@rock-chips.com>
Cc: dianders@chromium.org, tfiga@chromium.org, heiko@sntech.de,
	yzq@rock-chips.com, mark.rutland@arm.com,
	devicetree@vger.kernel.org, robh+dt@kernel.org,
	galak@codeaurora.org, pawel.moll@arm.com,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-rockchip@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 3/5] drm/rockchip/dsi: remove mode_valid function
Date: Mon, 23 Jan 2017 12:48:41 -0500	[thread overview]
Message-ID: <20170123174841.GB25789@trickycodes.roam.corp.google.com> (raw)
In-Reply-To: <1484907051-7159-4-git-send-email-zyw@rock-chips.com>

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

> 
> Signed-off-by: Chris Zhong <zyw@rock-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
> 
> _______________________________________________
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> dri-devel@lists.freedesktop.org
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-- 
Sean Paul, Software Engineer, Google / Chromium OS