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

[Sean Paul <seanpaul@chromium.org>]

On Tue, Jan 24, 2017 at 10:27:27AM +0800, Chris Zhong wrote:
> 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.

I don't see anything in the vop driver that rejects large modes for little vop.
So, while I agree the check shouldn't be here, you should move it to where it
should be instead of removing it entirely.

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
> >>https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> 
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-- 
Sean Paul, Software Engineer, Google / Chromium OS