1 // SPDX-License-Identifier: GPL-2.0-only
2 /**************************************************************************
3 * Copyright (c) 2011, Intel Corporation.
6 **************************************************************************/
8 #include <linux/backlight.h>
12 #include "gma_device.h"
13 #include "intel_bios.h"
14 #include "psb_device.h"
16 #include "psb_intel_reg.h"
19 static int psb_output_init(struct drm_device *dev)
21 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
22 psb_intel_lvds_init(dev, &dev_priv->mode_dev);
23 psb_intel_sdvo_init(dev, SDVOB);
27 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
30 * Poulsbo Backlight Interfaces
33 #define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
34 #define BLC_PWM_FREQ_CALC_CONSTANT 32
37 #define PSB_BLC_PWM_PRECISION_FACTOR 10
38 #define PSB_BLC_MAX_PWM_REG_FREQ 0xFFFE
39 #define PSB_BLC_MIN_PWM_REG_FREQ 0x2
41 #define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
42 #define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
44 static int psb_brightness;
45 static struct backlight_device *psb_backlight_device;
47 static int psb_get_brightness(struct backlight_device *bd)
49 /* return locally cached var instead of HW read (due to DPST etc.) */
50 /* FIXME: ideally return actual value in case firmware fiddled with
52 return psb_brightness;
56 static int psb_backlight_setup(struct drm_device *dev)
58 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
59 unsigned long core_clock;
60 /* u32 bl_max_freq; */
61 /* unsigned long value; */
64 uint32_t blc_pwm_precision_factor;
66 /* get bl_max_freq and pol from dev_priv*/
67 if (!dev_priv->lvds_bl) {
68 dev_err(dev->dev, "Has no valid LVDS backlight info\n");
71 bl_max_freq = dev_priv->lvds_bl->freq;
72 blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
74 core_clock = dev_priv->core_freq;
76 value = (core_clock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
77 value *= blc_pwm_precision_factor;
79 value /= blc_pwm_precision_factor;
81 if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
82 value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
85 value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
86 REG_WRITE(BLC_PWM_CTL,
87 (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | (value));
92 static int psb_set_brightness(struct backlight_device *bd)
94 struct drm_device *dev = bl_get_data(psb_backlight_device);
95 int level = bd->props.brightness;
97 /* Percentage 1-100% being valid */
101 psb_intel_lvds_set_brightness(dev, level);
102 psb_brightness = level;
106 static const struct backlight_ops psb_ops = {
107 .get_brightness = psb_get_brightness,
108 .update_status = psb_set_brightness,
111 static int psb_backlight_init(struct drm_device *dev)
113 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
115 struct backlight_properties props;
117 memset(&props, 0, sizeof(struct backlight_properties));
118 props.max_brightness = 100;
119 props.type = BACKLIGHT_PLATFORM;
121 psb_backlight_device = backlight_device_register("psb-bl",
122 NULL, (void *)dev, &psb_ops, &props);
123 if (IS_ERR(psb_backlight_device))
124 return PTR_ERR(psb_backlight_device);
126 ret = psb_backlight_setup(dev);
128 backlight_device_unregister(psb_backlight_device);
129 psb_backlight_device = NULL;
132 psb_backlight_device->props.brightness = 100;
133 psb_backlight_device->props.max_brightness = 100;
134 backlight_update_status(psb_backlight_device);
135 dev_priv->backlight_device = psb_backlight_device;
137 /* This must occur after the backlight is properly initialised */
138 psb_lid_timer_init(dev_priv);
146 * Provide the Poulsbo specific chip logic and low level methods
147 * for power management
150 static void psb_init_pm(struct drm_device *dev)
152 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
154 u32 gating = PSB_RSGX32(PSB_CR_CLKGATECTL);
155 gating &= ~3; /* Disable 2D clock gating */
157 PSB_WSGX32(gating, PSB_CR_CLKGATECTL);
158 PSB_RSGX32(PSB_CR_CLKGATECTL);
162 * psb_save_display_registers - save registers lost on suspend
163 * @dev: our DRM device
165 * Save the state we need in order to be able to restore the interface
166 * upon resume from suspend
168 static int psb_save_display_registers(struct drm_device *dev)
170 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
171 struct gma_connector *gma_connector;
172 struct drm_crtc *crtc;
173 struct drm_connector_list_iter conn_iter;
174 struct drm_connector *connector;
175 struct psb_state *regs = &dev_priv->regs.psb;
177 /* Display arbitration control + watermarks */
178 regs->saveDSPARB = PSB_RVDC32(DSPARB);
179 regs->saveDSPFW1 = PSB_RVDC32(DSPFW1);
180 regs->saveDSPFW2 = PSB_RVDC32(DSPFW2);
181 regs->saveDSPFW3 = PSB_RVDC32(DSPFW3);
182 regs->saveDSPFW4 = PSB_RVDC32(DSPFW4);
183 regs->saveDSPFW5 = PSB_RVDC32(DSPFW5);
184 regs->saveDSPFW6 = PSB_RVDC32(DSPFW6);
185 regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT);
187 /* Save crtc and output state */
188 drm_modeset_lock_all(dev);
189 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
190 if (drm_helper_crtc_in_use(crtc))
191 dev_priv->ops->save_crtc(crtc);
194 drm_connector_list_iter_begin(dev, &conn_iter);
195 drm_for_each_connector_iter(connector, &conn_iter) {
196 gma_connector = to_gma_connector(connector);
197 if (gma_connector->save)
198 gma_connector->save(connector);
200 drm_connector_list_iter_end(&conn_iter);
202 drm_modeset_unlock_all(dev);
207 * psb_restore_display_registers - restore lost register state
208 * @dev: our DRM device
210 * Restore register state that was lost during suspend and resume.
212 static int psb_restore_display_registers(struct drm_device *dev)
214 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
215 struct gma_connector *gma_connector;
216 struct drm_crtc *crtc;
217 struct drm_connector_list_iter conn_iter;
218 struct drm_connector *connector;
219 struct psb_state *regs = &dev_priv->regs.psb;
221 /* Display arbitration + watermarks */
222 PSB_WVDC32(regs->saveDSPARB, DSPARB);
223 PSB_WVDC32(regs->saveDSPFW1, DSPFW1);
224 PSB_WVDC32(regs->saveDSPFW2, DSPFW2);
225 PSB_WVDC32(regs->saveDSPFW3, DSPFW3);
226 PSB_WVDC32(regs->saveDSPFW4, DSPFW4);
227 PSB_WVDC32(regs->saveDSPFW5, DSPFW5);
228 PSB_WVDC32(regs->saveDSPFW6, DSPFW6);
229 PSB_WVDC32(regs->saveCHICKENBIT, DSPCHICKENBIT);
231 /*make sure VGA plane is off. it initializes to on after reset!*/
232 PSB_WVDC32(0x80000000, VGACNTRL);
234 drm_modeset_lock_all(dev);
235 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
236 if (drm_helper_crtc_in_use(crtc))
237 dev_priv->ops->restore_crtc(crtc);
239 drm_connector_list_iter_begin(dev, &conn_iter);
240 drm_for_each_connector_iter(connector, &conn_iter) {
241 gma_connector = to_gma_connector(connector);
242 if (gma_connector->restore)
243 gma_connector->restore(connector);
245 drm_connector_list_iter_end(&conn_iter);
247 drm_modeset_unlock_all(dev);
251 static int psb_power_down(struct drm_device *dev)
256 static int psb_power_up(struct drm_device *dev)
262 static const struct psb_offset psb_regmap[2] = {
276 .stride = DSPASTRIDE,
283 .linoff = DSPALINOFF,
284 .tileoff = DSPATILEOFF,
285 .palette = PALETTE_A,
300 .stride = DSPBSTRIDE,
307 .linoff = DSPBLINOFF,
308 .tileoff = DSPBTILEOFF,
309 .palette = PALETTE_B,
313 static int psb_chip_setup(struct drm_device *dev)
315 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
316 dev_priv->regmap = psb_regmap;
317 gma_get_core_freq(dev);
318 gma_intel_setup_gmbus(dev);
319 psb_intel_opregion_init(dev);
320 psb_intel_init_bios(dev);
324 static void psb_chip_teardown(struct drm_device *dev)
326 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
327 psb_lid_timer_takedown(dev_priv);
328 gma_intel_teardown_gmbus(dev);
331 const struct psb_ops psb_chip_ops = {
335 .hdmi_mask = (1 << 0),
336 .lvds_mask = (1 << 1),
337 .sdvo_mask = (1 << 0),
338 .cursor_needs_phys = 1,
339 .sgx_offset = PSB_SGX_OFFSET,
340 .chip_setup = psb_chip_setup,
341 .chip_teardown = psb_chip_teardown,
343 .crtc_helper = &psb_intel_helper_funcs,
344 .clock_funcs = &psb_clock_funcs,
346 .output_init = psb_output_init,
348 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
349 .backlight_init = psb_backlight_init,
352 .init_pm = psb_init_pm,
353 .save_regs = psb_save_display_registers,
354 .restore_regs = psb_restore_display_registers,
355 .save_crtc = gma_crtc_save,
356 .restore_crtc = gma_crtc_restore,
357 .power_down = psb_power_down,
358 .power_up = psb_power_up,