2 * Copyright © 2013 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 * Shobhit Kumar <shobhit.kumar@intel.com>
25 * Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
28 #include <linux/kernel.h>
32 #include "intel_display_types.h"
33 #include "intel_dsi.h"
34 #include "intel_sideband.h"
36 static const u16 lfsr_converts[] = {
37 426, 469, 234, 373, 442, 221, 110, 311, 411, /* 62 - 70 */
38 461, 486, 243, 377, 188, 350, 175, 343, 427, 213, /* 71 - 80 */
39 106, 53, 282, 397, 454, 227, 113, 56, 284, 142, /* 81 - 90 */
40 71, 35, 273, 136, 324, 418, 465, 488, 500, 506 /* 91 - 100 */
43 /* Get DSI clock from pixel clock */
44 static u32 dsi_clk_from_pclk(u32 pclk, enum mipi_dsi_pixel_format fmt,
48 u32 bpp = mipi_dsi_pixel_format_to_bpp(fmt);
50 /* DSI data rate = pixel clock * bits per pixel / lane count
51 pixel clock is converted from KHz to Hz */
52 dsi_clk_khz = DIV_ROUND_CLOSEST(pclk * bpp, lane_count);
57 static int dsi_calc_mnp(struct drm_i915_private *dev_priv,
58 struct intel_crtc_state *config,
61 unsigned int m_min, m_max, p_min = 2, p_max = 6;
63 unsigned int calc_m, calc_p;
66 /* target_dsi_clk is expected in kHz */
67 if (target_dsi_clk < 300000 || target_dsi_clk > 1150000) {
68 drm_err(&dev_priv->drm, "DSI CLK Out of Range\n");
72 if (IS_CHERRYVIEW(dev_priv)) {
86 delta = abs(target_dsi_clk - (m_min * ref_clk) / (p_min * n));
88 for (m = m_min; m <= m_max && delta; m++) {
89 for (p = p_min; p <= p_max && delta; p++) {
91 * Find the optimal m and p divisors with minimal delta
92 * +/- the required clock
94 int calc_dsi_clk = (m * ref_clk) / (p * n);
95 int d = abs(target_dsi_clk - calc_dsi_clk);
104 /* register has log2(N1), this works fine for powers of two */
105 config->dsi_pll.ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2);
106 config->dsi_pll.div =
107 (ffs(n) - 1) << DSI_PLL_N1_DIV_SHIFT |
108 (u32)lfsr_converts[calc_m - 62] << DSI_PLL_M1_DIV_SHIFT;
114 * XXX: The muxing and gating is hard coded for now. Need to add support for
115 * sharing PLLs with two DSI outputs.
117 int vlv_dsi_pll_compute(struct intel_encoder *encoder,
118 struct intel_crtc_state *config)
120 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
121 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
125 dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
126 intel_dsi->lane_count);
128 ret = dsi_calc_mnp(dev_priv, config, dsi_clk);
130 drm_dbg_kms(&dev_priv->drm, "dsi_calc_mnp failed\n");
134 if (intel_dsi->ports & (1 << PORT_A))
135 config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI0_DSIPLL;
137 if (intel_dsi->ports & (1 << PORT_C))
138 config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI1_DSIPLL;
140 config->dsi_pll.ctrl |= DSI_PLL_VCO_EN;
142 drm_dbg_kms(&dev_priv->drm, "dsi pll div %08x, ctrl %08x\n",
143 config->dsi_pll.div, config->dsi_pll.ctrl);
148 void vlv_dsi_pll_enable(struct intel_encoder *encoder,
149 const struct intel_crtc_state *config)
151 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
153 drm_dbg_kms(&dev_priv->drm, "\n");
155 vlv_cck_get(dev_priv);
157 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
158 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, config->dsi_pll.div);
159 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL,
160 config->dsi_pll.ctrl & ~DSI_PLL_VCO_EN);
162 /* wait at least 0.5 us after ungating before enabling VCO,
163 * allow hrtimer subsystem optimization by relaxing timing
165 usleep_range(10, 50);
167 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl);
169 if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) &
172 vlv_cck_put(dev_priv);
173 drm_err(&dev_priv->drm, "DSI PLL lock failed\n");
176 vlv_cck_put(dev_priv);
178 drm_dbg_kms(&dev_priv->drm, "DSI PLL locked\n");
181 void vlv_dsi_pll_disable(struct intel_encoder *encoder)
183 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
186 drm_dbg_kms(&dev_priv->drm, "\n");
188 vlv_cck_get(dev_priv);
190 tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
191 tmp &= ~DSI_PLL_VCO_EN;
192 tmp |= DSI_PLL_LDO_GATE;
193 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
195 vlv_cck_put(dev_priv);
198 bool bxt_dsi_pll_is_enabled(struct drm_i915_private *dev_priv)
204 mask = BXT_DSI_PLL_DO_ENABLE | BXT_DSI_PLL_LOCKED;
205 val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE);
206 enabled = (val & mask) == mask;
212 * Dividers must be programmed with valid values. As per BSEPC, for
213 * GEMINLAKE only PORT A divider values are checked while for BXT
214 * both divider values are validated. Check this here for
215 * paranoia, since BIOS is known to misconfigure PLLs in this way at
216 * times, and since accessing DSI registers with invalid dividers
217 * causes a system hang.
219 val = intel_de_read(dev_priv, BXT_DSI_PLL_CTL);
220 if (IS_GEMINILAKE(dev_priv)) {
221 if (!(val & BXT_DSIA_16X_MASK)) {
222 drm_dbg(&dev_priv->drm,
223 "Invalid PLL divider (%08x)\n", val);
227 if (!(val & BXT_DSIA_16X_MASK) || !(val & BXT_DSIC_16X_MASK)) {
228 drm_dbg(&dev_priv->drm,
229 "Invalid PLL divider (%08x)\n", val);
237 void bxt_dsi_pll_disable(struct intel_encoder *encoder)
239 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
242 drm_dbg_kms(&dev_priv->drm, "\n");
244 val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE);
245 val &= ~BXT_DSI_PLL_DO_ENABLE;
246 intel_de_write(dev_priv, BXT_DSI_PLL_ENABLE, val);
249 * PLL lock should deassert within 200us.
250 * Wait up to 1ms before timing out.
252 if (intel_de_wait_for_clear(dev_priv, BXT_DSI_PLL_ENABLE,
253 BXT_DSI_PLL_LOCKED, 1))
254 drm_err(&dev_priv->drm,
255 "Timeout waiting for PLL lock deassertion\n");
258 u32 vlv_dsi_get_pclk(struct intel_encoder *encoder,
259 struct intel_crtc_state *config)
261 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
262 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
263 int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
265 u32 pll_ctl, pll_div;
267 int refclk = IS_CHERRYVIEW(dev_priv) ? 100000 : 25000;
270 drm_dbg_kms(&dev_priv->drm, "\n");
272 vlv_cck_get(dev_priv);
273 pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
274 pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
275 vlv_cck_put(dev_priv);
277 config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK;
278 config->dsi_pll.div = pll_div;
280 /* mask out other bits and extract the P1 divisor */
281 pll_ctl &= DSI_PLL_P1_POST_DIV_MASK;
282 pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2);
285 n = (pll_div & DSI_PLL_N1_DIV_MASK) >> DSI_PLL_N1_DIV_SHIFT;
286 n = 1 << n; /* register has log2(N1) */
288 /* mask out the other bits and extract the M1 divisor */
289 pll_div &= DSI_PLL_M1_DIV_MASK;
290 pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT;
293 pll_ctl = pll_ctl >> 1;
299 drm_err(&dev_priv->drm, "wrong P1 divisor\n");
303 for (i = 0; i < ARRAY_SIZE(lfsr_converts); i++) {
304 if (lfsr_converts[i] == pll_div)
308 if (i == ARRAY_SIZE(lfsr_converts)) {
309 drm_err(&dev_priv->drm, "wrong m_seed programmed\n");
315 dsi_clock = (m * refclk) / (p * n);
317 pclk = DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count, bpp);
322 u32 bxt_dsi_get_pclk(struct intel_encoder *encoder,
323 struct intel_crtc_state *config)
328 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
329 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
330 int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
332 config->dsi_pll.ctrl = intel_de_read(dev_priv, BXT_DSI_PLL_CTL);
334 dsi_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
336 dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2;
338 pclk = DIV_ROUND_CLOSEST(dsi_clk * intel_dsi->lane_count, bpp);
340 drm_dbg(&dev_priv->drm, "Calculated pclk=%u\n", pclk);
344 void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
347 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
348 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
350 temp = intel_de_read(dev_priv, MIPI_CTRL(port));
351 temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
352 intel_de_write(dev_priv, MIPI_CTRL(port),
353 temp | intel_dsi->escape_clk_div << ESCAPE_CLOCK_DIVIDER_SHIFT);
356 static void glk_dsi_program_esc_clock(struct drm_device *dev,
357 const struct intel_crtc_state *config)
359 struct drm_i915_private *dev_priv = to_i915(dev);
368 pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
370 dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
372 ddr_clk = dsi_rate / 2;
374 /* Variable divider value */
375 div1_value = DIV_ROUND_CLOSEST(ddr_clk, 20000);
377 /* Calculate TXESC1 divider */
378 if (div1_value <= 10)
379 txesc1_div = div1_value;
380 else if ((div1_value > 10) && (div1_value <= 20))
381 txesc1_div = DIV_ROUND_UP(div1_value, 2);
382 else if ((div1_value > 20) && (div1_value <= 30))
383 txesc1_div = DIV_ROUND_UP(div1_value, 4);
384 else if ((div1_value > 30) && (div1_value <= 40))
385 txesc1_div = DIV_ROUND_UP(div1_value, 6);
386 else if ((div1_value > 40) && (div1_value <= 50))
387 txesc1_div = DIV_ROUND_UP(div1_value, 8);
391 /* Calculate TXESC2 divider */
392 div2_value = DIV_ROUND_UP(div1_value, txesc1_div);
395 txesc2_div = div2_value;
399 intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV1,
400 (1 << (txesc1_div - 1)) & GLK_TX_ESC_CLK_DIV1_MASK);
401 intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV2,
402 (1 << (txesc2_div - 1)) & GLK_TX_ESC_CLK_DIV2_MASK);
405 /* Program BXT Mipi clocks and dividers */
406 static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port,
407 const struct intel_crtc_state *config)
409 struct drm_i915_private *dev_priv = to_i915(dev);
417 u32 mipi_8by3_divider;
419 /* Clear old configurations */
420 tmp = intel_de_read(dev_priv, BXT_MIPI_CLOCK_CTL);
421 tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
422 tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port));
423 tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
424 tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
426 /* Get the current DSI rate(actual) */
427 pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
428 dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
431 * tx clock should be <= 20MHz and the div value must be
432 * subtracted by 1 as per bspec
434 tx_div = DIV_ROUND_UP(dsi_rate, 20000) - 1;
436 * rx clock should be <= 150MHz and the div value must be
437 * subtracted by 1 as per bspec
439 rx_div = DIV_ROUND_UP(dsi_rate, 150000) - 1;
442 * rx divider value needs to be updated in the
443 * two differnt bit fields in the register hence splitting the
444 * rx divider value accordingly
446 rx_div_lower = rx_div & RX_DIVIDER_BIT_1_2;
447 rx_div_upper = (rx_div & RX_DIVIDER_BIT_3_4) >> 2;
449 mipi_8by3_divider = 0x2;
451 tmp |= BXT_MIPI_8X_BY3_DIVIDER(port, mipi_8by3_divider);
452 tmp |= BXT_MIPI_TX_ESCLK_DIVIDER(port, tx_div);
453 tmp |= BXT_MIPI_RX_ESCLK_LOWER_DIVIDER(port, rx_div_lower);
454 tmp |= BXT_MIPI_RX_ESCLK_UPPER_DIVIDER(port, rx_div_upper);
456 intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp);
459 int bxt_dsi_pll_compute(struct intel_encoder *encoder,
460 struct intel_crtc_state *config)
462 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
463 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
464 u8 dsi_ratio, dsi_ratio_min, dsi_ratio_max;
467 dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
468 intel_dsi->lane_count);
471 * From clock diagram, to get PLL ratio divider, divide double of DSI
472 * link rate (i.e., 2*8x=16x frequency value) by ref clock. Make sure to
473 * round 'up' the result
475 dsi_ratio = DIV_ROUND_UP(dsi_clk * 2, BXT_REF_CLOCK_KHZ);
477 if (IS_BROXTON(dev_priv)) {
478 dsi_ratio_min = BXT_DSI_PLL_RATIO_MIN;
479 dsi_ratio_max = BXT_DSI_PLL_RATIO_MAX;
481 dsi_ratio_min = GLK_DSI_PLL_RATIO_MIN;
482 dsi_ratio_max = GLK_DSI_PLL_RATIO_MAX;
485 if (dsi_ratio < dsi_ratio_min || dsi_ratio > dsi_ratio_max) {
486 drm_err(&dev_priv->drm,
487 "Can't get a suitable ratio from DSI PLL ratios\n");
490 drm_dbg_kms(&dev_priv->drm, "DSI PLL calculation is Done!!\n");
493 * Program DSI ratio and Select MIPIC and MIPIA PLL output as 8x
494 * Spec says both have to be programmed, even if one is not getting
495 * used. Configure MIPI_CLOCK_CTL dividers in modeset
497 config->dsi_pll.ctrl = dsi_ratio | BXT_DSIA_16X_BY2 | BXT_DSIC_16X_BY2;
499 /* As per recommendation from hardware team,
500 * Prog PVD ratio =1 if dsi ratio <= 50
502 if (IS_BROXTON(dev_priv) && dsi_ratio <= 50)
503 config->dsi_pll.ctrl |= BXT_DSI_PLL_PVD_RATIO_1;
508 void bxt_dsi_pll_enable(struct intel_encoder *encoder,
509 const struct intel_crtc_state *config)
511 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
512 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
516 drm_dbg_kms(&dev_priv->drm, "\n");
518 /* Configure PLL vales */
519 intel_de_write(dev_priv, BXT_DSI_PLL_CTL, config->dsi_pll.ctrl);
520 intel_de_posting_read(dev_priv, BXT_DSI_PLL_CTL);
522 /* Program TX, RX, Dphy clocks */
523 if (IS_BROXTON(dev_priv)) {
524 for_each_dsi_port(port, intel_dsi->ports)
525 bxt_dsi_program_clocks(encoder->base.dev, port, config);
527 glk_dsi_program_esc_clock(encoder->base.dev, config);
531 val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE);
532 val |= BXT_DSI_PLL_DO_ENABLE;
533 intel_de_write(dev_priv, BXT_DSI_PLL_ENABLE, val);
535 /* Timeout and fail if PLL not locked */
536 if (intel_de_wait_for_set(dev_priv, BXT_DSI_PLL_ENABLE,
537 BXT_DSI_PLL_LOCKED, 1)) {
538 drm_err(&dev_priv->drm,
539 "Timed out waiting for DSI PLL to lock\n");
543 drm_dbg_kms(&dev_priv->drm, "DSI PLL locked\n");
546 void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
549 struct drm_device *dev = encoder->base.dev;
550 struct drm_i915_private *dev_priv = to_i915(dev);
552 /* Clear old configurations */
553 if (IS_BROXTON(dev_priv)) {
554 tmp = intel_de_read(dev_priv, BXT_MIPI_CLOCK_CTL);
555 tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
556 tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port));
557 tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
558 tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
559 intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp);
561 tmp = intel_de_read(dev_priv, MIPIO_TXESC_CLK_DIV1);
562 tmp &= ~GLK_TX_ESC_CLK_DIV1_MASK;
563 intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV1, tmp);
565 tmp = intel_de_read(dev_priv, MIPIO_TXESC_CLK_DIV2);
566 tmp &= ~GLK_TX_ESC_CLK_DIV2_MASK;
567 intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV2, tmp);
569 intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP);