diff mbox series

[v4,2/2] drm/bridge: add it6505 driver to read data-lanes and link-frequencies from dt

Message ID 20221013105116.180380-3-allen.chen@ite.com.tw
State New
Headers
Series *** IT6505 driver read dt properties *** |

Commit Message

allen Oct. 13, 2022, 10:51 a.m. UTC 
  From: allen chen <allen.chen@ite.com.tw>

Add driver to read data-lanes and link-frequencies from dt property to
restrict output bandwidth.

Signed-off-by: Allen chen <allen.chen@ite.com.tw>
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 54 +++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 3 deletions(-)

Comments

kernel test robot Oct. 13, 2022, 6:42 p.m. UTC | #1 
Hi allen,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v6.0 next-20221013]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/allen/IT6505-driver-read-dt-properties/20221013-185334
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20221013105116.180380-3-allen.chen%40ite.com.tw
patch subject: [PATCH v4 2/2] drm/bridge: add it6505 driver to read data-lanes and link-frequencies from dt
config: mips-allyesconfig
compiler: mips-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/5c17730237cfc2b768593632c4095cc9d40c1787
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review allen/IT6505-driver-read-dt-properties/20221013-185334
        git checkout 5c17730237cfc2b768593632c4095cc9d40c1787
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arch/mips/kernel/head.o: in function `kernel_entry':
   (.ref.text+0xac): relocation truncated to fit: R_MIPS_26 against `start_kernel'
   init/main.o: in function `set_reset_devices':
   main.c:(.init.text+0x20): relocation truncated to fit: R_MIPS_26 against `_mcount'
   main.c:(.init.text+0x30): relocation truncated to fit: R_MIPS_26 against `__sanitizer_cov_trace_pc'
   init/main.o: in function `debug_kernel':
   main.c:(.init.text+0xa4): relocation truncated to fit: R_MIPS_26 against `_mcount'
   main.c:(.init.text+0xb4): relocation truncated to fit: R_MIPS_26 against `__sanitizer_cov_trace_pc'
   init/main.o: in function `quiet_kernel':
   main.c:(.init.text+0x128): relocation truncated to fit: R_MIPS_26 against `_mcount'
   main.c:(.init.text+0x138): relocation truncated to fit: R_MIPS_26 against `__sanitizer_cov_trace_pc'
   init/main.o: in function `warn_bootconfig':
   main.c:(.init.text+0x1ac): relocation truncated to fit: R_MIPS_26 against `_mcount'
   main.c:(.init.text+0x1bc): relocation truncated to fit: R_MIPS_26 against `__sanitizer_cov_trace_pc'
   init/main.o: in function `init_setup':
   main.c:(.init.text+0x234): relocation truncated to fit: R_MIPS_26 against `_mcount'
   main.c:(.init.text+0x254): additional relocation overflows omitted from the output
   mips-linux-ld: drivers/gpu/drm/bridge/ite-it6505.o: in function `it6505_parse_dt':
>> ite-it6505.c:(.text.it6505_parse_dt+0x280): undefined reference to `__udivdi3'
kernel test robot Oct. 13, 2022, 7:52 p.m. UTC | #2 
Hi allen,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v6.0 next-20221013]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/allen/IT6505-driver-read-dt-properties/20221013-185334
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
config: m68k-allyesconfig
compiler: m68k-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/5c17730237cfc2b768593632c4095cc9d40c1787
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review allen/IT6505-driver-read-dt-properties/20221013-185334
        git checkout 5c17730237cfc2b768593632c4095cc9d40c1787
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   m68k-linux-ld: drivers/gpu/drm/bridge/ite-it6505.o: in function `it6505_parse_dt':
>> ite-it6505.c:(.text+0x470): undefined reference to `__udivdi3'
   `.exit.text' referenced in section `.data' of sound/soc/codecs/tlv320adc3xxx.o: defined in discarded section `.exit.text' of sound/soc/codecs/tlv320adc3xxx.o
diff mbox series

Patch

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index a4302492cf8df..653ab38465b98 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -437,6 +437,8 @@  struct it6505 {
 	bool powered;
 	bool hpd_state;
 	u32 afe_setting;
+	u32 max_dpi_pixel_clock;
+	u32 max_lane_count;
 	enum hdcp_state hdcp_status;
 	struct delayed_work hdcp_work;
 	struct work_struct hdcp_wait_ksv_list;
@@ -1476,7 +1478,8 @@  static void it6505_parse_link_capabilities(struct it6505 *it6505)
 	it6505->lane_count = link->num_lanes;
 	DRM_DEV_DEBUG_DRIVER(dev, "Sink support %d lanes training",
 			     it6505->lane_count);
-	it6505->lane_count = min_t(int, it6505->lane_count, MAX_LANE_COUNT);
+	it6505->lane_count = min_t(int, it6505->lane_count,
+				   it6505->max_lane_count);
 
 	it6505->branch_device = drm_dp_is_branch(it6505->dpcd);
 	DRM_DEV_DEBUG_DRIVER(dev, "Sink %sbranch device",
@@ -2912,7 +2915,7 @@  it6505_bridge_mode_valid(struct drm_bridge *bridge,
 	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 		return MODE_NO_INTERLACE;
 
-	if (mode->clock > DPI_PIXEL_CLK_MAX)
+	if (mode->clock > it6505->max_dpi_pixel_clock)
 		return MODE_CLOCK_HIGH;
 
 	it6505->video_info.clock = mode->clock;
@@ -3102,7 +3105,13 @@  static int it6505_init_pdata(struct it6505 *it6505)
 static void it6505_parse_dt(struct it6505 *it6505)
 {
 	struct device *dev = &it6505->client->dev;
+	struct device_node *np = dev->of_node, *ep = NULL;
+	int len;
+	u64 link_frequencies;
+	u32 data_lanes[4];
 	u32 *afe_setting = &it6505->afe_setting;
+	u32 *max_lane_count = &it6505->max_lane_count;
+	u32 *max_dpi_pixel_clock = &it6505->max_dpi_pixel_clock;
 
 	it6505->lane_swap_disabled =
 		device_property_read_bool(dev, "no-laneswap");
@@ -3118,7 +3127,46 @@  static void it6505_parse_dt(struct it6505 *it6505)
 	} else {
 		*afe_setting = 0;
 	}
-	DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %d", *afe_setting);
+
+	len = of_property_read_variable_u32_array(np, "data-lanes",
+						  data_lanes, 0,
+						  ARRAY_SIZE(data_lanes));
+	*max_lane_count = len;
+
+	if (len < 0 || *max_lane_count == 3 || *max_lane_count > 4) {
+		dev_err(dev, "error data-lanes, use default");
+		*max_lane_count = MAX_LANE_COUNT;
+	}
+
+	ep = of_graph_get_endpoint_by_regs(np, 0, 0);
+
+	if (ep) {
+		len = of_property_read_variable_u64_array(ep,
+							  "link-frequencies",
+							  &link_frequencies, 0,
+							  1);
+		if (len >= 0) {
+			link_frequencies /= 1000;
+			if (link_frequencies > 297000) {
+				dev_err(dev,
+					"max pixel clock error, use default");
+				*max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
+			} else {
+				*max_dpi_pixel_clock = link_frequencies;
+			}
+		} else {
+			dev_err(dev, "error link frequencies, use default");
+			*max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
+		}
+	} else {
+		dev_err(dev, "error endpoint, use default");
+		*max_dpi_pixel_clock = DPI_PIXEL_CLK_MAX;
+	}
+
+	DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %u, max_lane_count: %u",
+			     it6505->afe_setting, it6505->max_lane_count);
+	DRM_DEV_DEBUG_DRIVER(dev, "using max_dpi_pixel_clock: %u kHz",
+			     it6505->max_dpi_pixel_clock);
 }
 
 static ssize_t receive_timing_debugfs_show(struct file *file, char __user *buf,