Hi, On 9/4/2015 12:00 AM, Hai Li wrote: > Lane swap configuration is based on the board design. > This change allows the DSI host to get this information > from device tree, instead of hardcoding in driver. > > Signed-off-by: Hai Li <hali at codeaurora.org> > --- > Documentation/devicetree/bindings/drm/msm/dsi.txt | 13 ++++++ > drivers/gpu/drm/msm/dsi/dsi_host.c | 49 > +++++++++++++++++------ > 2 files changed, 49 insertions(+), 13 deletions(-) > > diff --git a/Documentation/devicetree/bindings/drm/msm/dsi.txt > b/Documentation/devicetree/bindings/drm/msm/dsi.txt > index d56923c..febcc51 100644 > --- a/Documentation/devicetree/bindings/drm/msm/dsi.txt > +++ b/Documentation/devicetree/bindings/drm/msm/dsi.txt > @@ -44,6 +44,17 @@ Optional properties: > - port: DSI controller output port. This contains one endpoint subnode, > with its > remote-endpoint set to the phandle of the connected panel's endpoint. > See Documentation/devicetree/bindings/graph.txt for device graph info. > +- qcom,dsi-logical-lane-swap: Character string to swap logical lane to > physical > + lane mapping. Supported lane mappings: > + "0123": Logic 0->Phys 0; Logic 1->Phys 1; Logic 2->Phys 2; Logic 3->Phys 3; > + "3012": Logic 3->Phys 0; Logic 0->Phys 1; Logic 1->Phys 2; Logic 2->Phys 3; > + "2301": Logic 2->Phys 0; Logic 3->Phys 1; Logic 0->Phys 2; Logic 1->Phys 3; > + "1230": Logic 1->Phys 0; Logic 2->Phys 1; Logic 3->Phys 2; Logic 0->Phys 3; > + "0321": Logic 0->Phys 0; Logic 3->Phys 1; Logic 2->Phys 2; Logic 1->Phys 3; > + "1032": Logic 1->Phys 0; Logic 0->Phys 1; Logic 3->Phys 2; Logic 2->Phys 3; > + "2103": Logic 2->Phys 0; Logic 1->Phys 1; Logic 0->Phys 2; Logic 3->Phys 3; > + "3210": Logic 3->Phys 0; Logic 2->Phys 1; Logic 1->Phys 2; Logic 0->Phys 3; > + Default value is "0123", which means no lane swap. > > DSI PHY: > Required properties: > @@ -129,6 +140,8 @@ Example: > remote-endpoint = <&panel_in>; > }; > }; > + > + qcom,dsi-logical-lane-swap = "0123"; > };
I think we could keep this in the output port DT node instead, since it is more of a property of how it connects to the panel. There is a more generic way to represent lane info. It would be nice to have a look at what's done here: http://marc.info/?l=linux-omap&m=133605367610068&w=2 and it's usage here: http://lxr.free-electrons.com/source/arch/arm/boot/dts/omap4-sdp.dts#L647 Thanks, Archit > > mdss_dsi_phy0: qcom,mdss_dsi_phy at fd922a00 { > diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c > b/drivers/gpu/drm/msm/dsi/dsi_host.c > index 8d82973f..eaba417 100644 > --- a/drivers/gpu/drm/msm/dsi/dsi_host.c > +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c > @@ -131,6 +131,7 @@ struct msm_dsi_host { > enum mipi_dsi_pixel_format format; > unsigned long mode_flags; > > + u32 dlane_swap; > u32 dma_cmd_ctrl_restore; > > bool registered; > @@ -684,19 +685,9 @@ static void dsi_ctrl_config(struct msm_dsi_host > *msm_host, bool enable, > data = DSI_CTRL_CLK_EN; > > DBG("lane number=%d", msm_host->lanes); > - if (msm_host->lanes == 2) { > - data |= DSI_CTRL_LANE1 | DSI_CTRL_LANE2; > - /* swap lanes for 2-lane panel for better performance */ > - dsi_write(msm_host, REG_DSI_LANE_SWAP_CTRL, > - DSI_LANE_SWAP_CTRL_DLN_SWAP_SEL(LANE_SWAP_1230)); > - } else { > - /* Take 4 lanes as default */ > - data |= DSI_CTRL_LANE0 | DSI_CTRL_LANE1 | DSI_CTRL_LANE2 | > - DSI_CTRL_LANE3; > - /* Do not swap lanes for 4-lane panel */ > - dsi_write(msm_host, REG_DSI_LANE_SWAP_CTRL, > - DSI_LANE_SWAP_CTRL_DLN_SWAP_SEL(LANE_SWAP_0123)); > - } > + data |= ((DSI_CTRL_LANE0 << msm_host->lanes) - DSI_CTRL_LANE0); > + dsi_write(msm_host, REG_DSI_LANE_SWAP_CTRL, > + DSI_LANE_SWAP_CTRL_DLN_SWAP_SEL(msm_host->dlane_swap)); > > if (!(flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)) > dsi_write(msm_host, REG_DSI_LANE_CTRL, > @@ -1289,6 +1280,9 @@ static int dsi_host_attach(struct mipi_dsi_host *host, > struct msm_dsi_host *msm_host = to_msm_dsi_host(host); > int ret; > > + if (dsi->lanes > 4 || dsi->channel > 3) > + return -EINVAL; > + > msm_host->channel = dsi->channel; > msm_host->lanes = dsi->lanes; > msm_host->format = dsi->format; > @@ -1344,6 +1338,33 @@ static struct mipi_dsi_host_ops dsi_host_ops = { > .transfer = dsi_host_transfer, > }; > > +static void dsi_parse_dlane_swap(struct msm_dsi_host *msm_host, > + struct device_node *np) > +{ > + const char *lane_swap; > + > + lane_swap = of_get_property(np, "qcom,dsi-logical-lane-swap", NULL); > + > + if (!lane_swap) > + msm_host->dlane_swap = LANE_SWAP_0123; > + else if (!strncmp(lane_swap, "3012", 5)) > + msm_host->dlane_swap = LANE_SWAP_3012; > + else if (!strncmp(lane_swap, "2301", 5)) > + msm_host->dlane_swap = LANE_SWAP_2301; > + else if (!strncmp(lane_swap, "1230", 5)) > + msm_host->dlane_swap = LANE_SWAP_1230; > + else if (!strncmp(lane_swap, "0321", 5)) > + msm_host->dlane_swap = LANE_SWAP_0321; > + else if (!strncmp(lane_swap, "1032", 5)) > + msm_host->dlane_swap = LANE_SWAP_1032; > + else if (!strncmp(lane_swap, "2103", 5)) > + msm_host->dlane_swap = LANE_SWAP_2103; > + else if (!strncmp(lane_swap, "3210", 5)) > + msm_host->dlane_swap = LANE_SWAP_3210; > + else > + msm_host->dlane_swap = LANE_SWAP_0123; > +} > + > static int dsi_host_parse_dt(struct msm_dsi_host *msm_host) > { > struct device *dev = &msm_host->pdev->dev; > @@ -1358,6 +1379,8 @@ static int dsi_host_parse_dt(struct msm_dsi_host > *msm_host) > return ret; > } > > + dsi_parse_dlane_swap(msm_host, np); > + > /* > * Get the first endpoint node. In our case, dsi has one output port > * to which the panel is connected. Don't return an error if a port > -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
