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Message-ID: <20170201181218.GA8595@art_vandelay>
Date: Wed, 1 Feb 2017 13:12:18 -0500
From: Sean Paul <seanpaul@...omium.org>
To: Chris Zhong <zyw@...k-chips.com>
Cc: mark.rutland@....com, devicetree@...r.kernel.org,
pawel.moll@....com, yzq@...k-chips.com,
linux-kernel@...r.kernel.org, dianders@...omium.org,
dri-devel@...ts.freedesktop.org, tfiga@...omium.org,
linux-rockchip@...ts.infradead.org, robh+dt@...nel.org,
galak@...eaurora.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/5] drm/rockchip/dsi: remove mode_valid function
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@...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
>
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Sean Paul, Software Engineer, Google / Chromium OS
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