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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cpanel.siel.si X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - norik.com X-Get-Message-Sender-Via: cpanel.siel.si: authenticated_id: andrej.picej@norik.com X-Authenticated-Sender: cpanel.siel.si: andrej.picej@norik.com X-Source: X-Source-Args: X-Source-Dir: On 10. 12. 24 14:59, Dmitry Baryshkov wrote: > On Tue, Dec 10, 2024 at 02:41:01PM +0100, Andrej Picej wrote: >> >> >> On 10. 12. 24 12:43, Dmitry Baryshkov wrote: >>> On Tue, Dec 10, 2024 at 10:19:00AM +0100, Andrej Picej wrote: >>>> Add a optional properties to change LVDS output voltage. This should not >>>> be static as this depends mainly on the connected display voltage >>>> requirement. We have three properties: >>>> - "ti,lvds-termination-ohms", which sets near end termination, >>>> - "ti,lvds-vod-swing-data-microvolt" and >>>> - "ti,lvds-vod-swing-clock-microvolt" which both set LVDS differential >>>> output voltage for data and clock lanes. They are defined as an array >>>> with min and max values. The appropriate bitfield will be set if >>>> selected constraints can be met. >>>> >>>> If "ti,lvds-termination-ohms" is not defined the default of 200 Ohm near >>>> end termination will be used. Selecting only one: >>>> "ti,lvds-vod-swing-data-microvolt" or >>>> "ti,lvds-vod-swing-clock-microvolt" can be done, but the output voltage >>>> constraint for only data/clock lanes will be met. Setting both is >>>> recommended. >>>> >>>> Signed-off-by: Andrej Picej >>>> --- >>>> Changes in v5: >>>> - specify default values in sn65dsi83_parse_lvds_endpoint, >>>> - move sn65dsi83_parse_lvds_endpoint for channel B up, outside if, >>>> Changes in v4: >>>> - fix typo in commit message bitfiled -> bitfield >>>> - use arrays (lvds_vod_swing_conf and lvds_term_conf) in private data, instead >>>> of separate variables for channel A/B >>>> - add more checks on return value of "of_property_read_u32_array" >>>> Changes in v3: >>>> - use microvolts for default array values 1000 mV -> 1000000 uV. >>>> Changes in v2: >>>> - use datasheet tables to get the proper configuration >>>> - since major change was done change the authorship to myself >>>> --- >>>> drivers/gpu/drm/bridge/ti-sn65dsi83.c | 142 +++++++++++++++++++++++++- >>>> 1 file changed, 139 insertions(+), 3 deletions(-) >>>> >>>> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c >>>> index 57a7ed13f996..f9578b38da28 100644 >>>> --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c >>>> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c >>>> @@ -132,6 +132,16 @@ >>>> #define REG_IRQ_STAT_CHA_SOT_BIT_ERR BIT(2) >>>> #define REG_IRQ_STAT_CHA_PLL_UNLOCK BIT(0) >>>> +enum sn65dsi83_channel { >>>> + CHANNEL_A, >>>> + CHANNEL_B >>>> +}; >>>> + >>>> +enum sn65dsi83_lvds_term { >>>> + OHM_100, >>>> + OHM_200 >>>> +}; >>>> + >>>> enum sn65dsi83_model { >>>> MODEL_SN65DSI83, >>>> MODEL_SN65DSI84, >>>> @@ -147,6 +157,8 @@ struct sn65dsi83 { >>>> struct regulator *vcc; >>>> bool lvds_dual_link; >>>> bool lvds_dual_link_even_odd_swap; >>>> + int lvds_vod_swing_conf[2]; >>>> + int lvds_term_conf[2]; >>>> }; >>>> static const struct regmap_range sn65dsi83_readable_ranges[] = { >>>> @@ -237,6 +249,36 @@ static const struct regmap_config sn65dsi83_regmap_config = { >>>> .max_register = REG_IRQ_STAT, >>>> }; >>>> +static const int lvds_vod_swing_data_table[2][4][2] = { >>>> + { /* 100 Ohm */ >>>> + { 180000, 313000 }, >>>> + { 215000, 372000 }, >>>> + { 250000, 430000 }, >>>> + { 290000, 488000 }, >>>> + }, >>>> + { /* 200 Ohm */ >>>> + { 150000, 261000 }, >>>> + { 200000, 346000 }, >>>> + { 250000, 428000 }, >>>> + { 300000, 511000 }, >>>> + }, >>>> +}; >>>> + >>>> +static const int lvds_vod_swing_clock_table[2][4][2] = { >>>> + { /* 100 Ohm */ >>>> + { 140000, 244000 }, >>>> + { 168000, 290000 }, >>>> + { 195000, 335000 }, >>>> + { 226000, 381000 }, >>>> + }, >>>> + { /* 200 Ohm */ >>>> + { 117000, 204000 }, >>>> + { 156000, 270000 }, >>>> + { 195000, 334000 }, >>>> + { 234000, 399000 }, >>>> + }, >>>> +}; >>>> + >>>> static struct sn65dsi83 *bridge_to_sn65dsi83(struct drm_bridge *bridge) >>>> { >>>> return container_of(bridge, struct sn65dsi83, bridge); >>>> @@ -435,12 +477,16 @@ static void sn65dsi83_atomic_pre_enable(struct drm_bridge *bridge, >>>> val |= REG_LVDS_FMT_LVDS_LINK_CFG; >>>> regmap_write(ctx->regmap, REG_LVDS_FMT, val); >>>> - regmap_write(ctx->regmap, REG_LVDS_VCOM, 0x05); >>>> + regmap_write(ctx->regmap, REG_LVDS_VCOM, >>>> + REG_LVDS_VCOM_CHA_LVDS_VOD_SWING(ctx->lvds_vod_swing_conf[CHANNEL_A]) | >>>> + REG_LVDS_VCOM_CHB_LVDS_VOD_SWING(ctx->lvds_vod_swing_conf[CHANNEL_B])); >>>> regmap_write(ctx->regmap, REG_LVDS_LANE, >>>> (ctx->lvds_dual_link_even_odd_swap ? >>>> REG_LVDS_LANE_EVEN_ODD_SWAP : 0) | >>>> - REG_LVDS_LANE_CHA_LVDS_TERM | >>>> - REG_LVDS_LANE_CHB_LVDS_TERM); >>>> + (ctx->lvds_term_conf[CHANNEL_A] ? >>>> + REG_LVDS_LANE_CHA_LVDS_TERM : 0) | >>>> + (ctx->lvds_term_conf[CHANNEL_B] ? >>>> + REG_LVDS_LANE_CHB_LVDS_TERM : 0)); >>>> regmap_write(ctx->regmap, REG_LVDS_CM, 0x00); >>>> le16val = cpu_to_le16(mode->hdisplay); >>>> @@ -576,10 +622,100 @@ static const struct drm_bridge_funcs sn65dsi83_funcs = { >>>> .atomic_get_input_bus_fmts = sn65dsi83_atomic_get_input_bus_fmts, >>>> }; >>>> +static int sn65dsi83_select_lvds_vod_swing(struct device *dev, >>>> + u32 lvds_vod_swing_data[2], u32 lvds_vod_swing_clk[2], u8 lvds_term) >>>> +{ >>>> + int i; >>>> + >>>> + for (i = 0; i <= 3; i++) { >>>> + if (lvds_vod_swing_data_table[lvds_term][i][0] >= lvds_vod_swing_data[0] && >>>> + lvds_vod_swing_data_table[lvds_term][i][1] <= lvds_vod_swing_data[1] && >>>> + lvds_vod_swing_clock_table[lvds_term][i][0] >= lvds_vod_swing_clk[0] && >>>> + lvds_vod_swing_clock_table[lvds_term][i][1] <= lvds_vod_swing_clk[1]) >>>> + return i; >>>> + } >>>> + >>>> + dev_err(dev, "failed to find appropriate LVDS_VOD_SWING configuration\n"); >>>> + return -EINVAL; >>>> +} >>>> + >>>> +static int sn65dsi83_parse_lvds_endpoint(struct sn65dsi83 *ctx, int channel) >>>> +{ >>>> + struct device *dev = ctx->dev; >>>> + struct device_node *endpoint; >>>> + int endpoint_reg; >>>> + /* Set so the property can be freely selected if not defined */ >>>> + u32 lvds_vod_swing_data[2] = { 0, 1000000 }; >>>> + u32 lvds_vod_swing_clk[2] = { 0, 1000000 }; >>>> + u32 lvds_term; >>>> + u8 lvds_term_conf = 0x1; >>>> + int lvds_vod_swing_conf = 0x1; >>> >>> Magic values >> >> Can you please elaborate. >> >> I can use: >> u8 lvds_term_conf = OHM_200; >> >> What about lvds_vod_swing_conf? Should I create additional define for it? >> But this doesn't solve a hidden meaning? Maybe additional comment above? >> Would like to avoid using voltages for it, since then we are reverse >> engineering the table in datasheet to match the default reg value. > > I think the following example solves both problems: > > lvds_term = 200; > of_property_read_u32(..., &lvds_term); > > if (lvds_term == 100) > ctx->lvds_term_conf[channel] = OHM_100; > else if (lvds_term == 200) > ctx->lvds_term_conf[channel] = OHM_200; > else > return -EINVAL; > > The same approach can be applied to lvds_vod_swing_conf, resulting in > removal of magic values. Sorry, but I think it is not that easy when it comes to the lvds_vod_swing_conf. We should assign default value if "ti,lvds-vod-swing-data-microvolt" and "ti,lvds-vod-swing-clock-microvolt" are not defined. Default value of the lvds_vod_swing_conf is 0x1, but this doesn't have any straight forward meaning like OHM_200 for example. What we can do in that case is that we copy the values from defined datasheet tables to the "lvds_vod_swing_data[2]" and "lvds_vod_swing_clk[2]" arrays and then run the sn65dsi83_select_lvds_vod_swing with it, which will return the default value (0x1). /* If both properties are not defined assign default limits */ if (ret_data && ret_clock) { memcpy(lvds_vod_swing_data, lvds_vod_swing_data_table[ctx->lvds_term_conf[channel]][1], sizeof(lvds_vod_swing_data)); memcpy(lvds_vod_swing_clk, lvds_vod_swing_clock_table[ctx->lvds_term_conf[channel]][1], sizeof(lvds_vod_swing_clk)); } lvds_vod_swing_conf = sn65dsi83_select_lvds_vod_swing(dev, lvds_vod_swing_data, lvds_vod_swing_clk, ctx->lvds_term_conf[channel]); if (lvds_vod_swing_conf < 0) { ret = lvds_vod_swing_conf; goto exit; } ctx->lvds_vod_swing_conf[channel] = lvds_vod_swing_conf; I'm not sure if using this approach gets rid of the problem with magic values. Or maybe I'm not seeing the obvious solution so please bear with me. > >> >>> >>>> + int ret = 0; >>>> + int ret_data; >>>> + int ret_clock; >>>> + >>>> + if (channel == CHANNEL_A) >>>> + endpoint_reg = 2; >>>> + else >>>> + endpoint_reg = 3; >>>> + >>>> + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, endpoint_reg, -1); >>>> + if (!of_property_read_u32(endpoint, "ti,lvds-termination-ohms", &lvds_term)) { >>> >>> The code has been better before: >>> provide default for lvds_term, read the property (keeping the default in >>> case of an error), then use the lvds_term to set up lvds_term_conf, as >>> expected. >> >> Ok, will revert back. >> >>> >>>> + if (lvds_term == 100) >>>> + lvds_term_conf = OHM_100; >>>> + else >>>> + lvds_term_conf = OHM_200; >>>> + } >>>> + >>>> + ctx->lvds_term_conf[channel] = lvds_term_conf; >>>> + >>>> + ret_data = of_property_read_u32_array(endpoint, >>>> + "ti,lvds-vod-swing-data-microvolt", lvds_vod_swing_data, >>>> + ARRAY_SIZE(lvds_vod_swing_data)); >>>> + if (ret_data != 0 && ret_data != -EINVAL) { >>>> + ret = ret_data; >>>> + goto exit; >>>> + } >>>> + >>>> + ret_clock = of_property_read_u32_array(endpoint, >>>> + "ti,lvds-vod-swing-clock-microvolt", lvds_vod_swing_clk, >>>> + ARRAY_SIZE(lvds_vod_swing_clk)); >>>> + if (ret_clock != 0 && ret_clock != -EINVAL) { >>>> + ret = ret_clock; >>>> + goto exit; >>>> + } >>>> + >>>> + /* If any of the two properties is defined. */ >>>> + if (!ret_data || !ret_clock) { >>>> + lvds_vod_swing_conf = sn65dsi83_select_lvds_vod_swing(dev, >>>> + lvds_vod_swing_data, lvds_vod_swing_clk, >>>> + lvds_term_conf); >>>> + if (lvds_vod_swing_conf < 0) { >>>> + ret = lvds_vod_swing_conf; >>>> + goto exit; >>>> + } >>>> + } >>>> + >>>> + ctx->lvds_vod_swing_conf[channel] = lvds_vod_swing_conf; >>>> + ret = 0; >>>> +exit: >>>> + of_node_put(endpoint); >>>> + return ret; >>>> +} >>>> + >>>> static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model) >>>> { >>>> struct drm_bridge *panel_bridge; >>>> struct device *dev = ctx->dev; >>>> + int ret; >>>> + >>>> + ret = sn65dsi83_parse_lvds_endpoint(ctx, CHANNEL_A); >>>> + if (ret < 0) >>>> + return ret; >>>> + >>>> + ret = sn65dsi83_parse_lvds_endpoint(ctx, CHANNEL_B); >>>> + if (ret < 0) >>>> + return ret; >>>> ctx->lvds_dual_link = false; >>>> ctx->lvds_dual_link_even_odd_swap = false; >>>> -- >>>> 2.34.1 >>>> >>> >