1 // SPDX-License-Identifier: MIT
3 * Copyright © 2013-2021 Intel Corporation
7 #include "i915_iosf_mbi.h"
9 #include "vlv_sideband.h"
11 #include "display/intel_dpio_phy.h"
12 #include "display/intel_display_types.h"
15 * IOSF sideband, see VLV2_SidebandMsg_HAS.docx and
16 * VLV_VLV2_PUNIT_HAS_0.8.docx
19 /* Standard MMIO read, non-posted */
20 #define SB_MRD_NP 0x00
21 /* Standard MMIO write, non-posted */
22 #define SB_MWR_NP 0x01
23 /* Private register read, double-word addressing, non-posted */
24 #define SB_CRRDDA_NP 0x06
25 /* Private register write, double-word addressing, non-posted */
26 #define SB_CRWRDA_NP 0x07
28 static void ping(void *info)
32 static void __vlv_punit_get(struct drm_i915_private *i915)
34 iosf_mbi_punit_acquire();
37 * Prevent the cpu from sleeping while we use this sideband, otherwise
38 * the punit may cause a machine hang. The issue appears to be isolated
39 * with changing the power state of the CPU package while changing
40 * the power state via the punit, and we have only observed it
41 * reliably on 4-core Baytail systems suggesting the issue is in the
42 * power delivery mechanism and likely to be board/function
43 * specific. Hence we presume the workaround needs only be applied
44 * to the Valleyview P-unit and not all sideband communications.
46 if (IS_VALLEYVIEW(i915)) {
47 cpu_latency_qos_update_request(&i915->sb_qos, 0);
48 on_each_cpu(ping, NULL, 1);
52 static void __vlv_punit_put(struct drm_i915_private *i915)
54 if (IS_VALLEYVIEW(i915))
55 cpu_latency_qos_update_request(&i915->sb_qos,
56 PM_QOS_DEFAULT_VALUE);
58 iosf_mbi_punit_release();
61 void vlv_iosf_sb_get(struct drm_i915_private *i915, unsigned long ports)
63 if (ports & BIT(VLV_IOSF_SB_PUNIT))
64 __vlv_punit_get(i915);
66 mutex_lock(&i915->sb_lock);
69 void vlv_iosf_sb_put(struct drm_i915_private *i915, unsigned long ports)
71 mutex_unlock(&i915->sb_lock);
73 if (ports & BIT(VLV_IOSF_SB_PUNIT))
74 __vlv_punit_put(i915);
77 static int vlv_sideband_rw(struct drm_i915_private *i915,
78 u32 devfn, u32 port, u32 opcode,
81 struct intel_uncore *uncore = &i915->uncore;
82 const bool is_read = (opcode == SB_MRD_NP || opcode == SB_CRRDDA_NP);
85 lockdep_assert_held(&i915->sb_lock);
86 if (port == IOSF_PORT_PUNIT)
87 iosf_mbi_assert_punit_acquired();
89 /* Flush the previous comms, just in case it failed last time. */
90 if (intel_wait_for_register(uncore,
91 VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0,
93 drm_dbg(&i915->drm, "IOSF sideband idle wait (%s) timed out\n",
94 is_read ? "read" : "write");
100 intel_uncore_write_fw(uncore, VLV_IOSF_ADDR, addr);
101 intel_uncore_write_fw(uncore, VLV_IOSF_DATA, is_read ? 0 : *val);
102 intel_uncore_write_fw(uncore, VLV_IOSF_DOORBELL_REQ,
103 (devfn << IOSF_DEVFN_SHIFT) |
104 (opcode << IOSF_OPCODE_SHIFT) |
105 (port << IOSF_PORT_SHIFT) |
106 (0xf << IOSF_BYTE_ENABLES_SHIFT) |
107 (0 << IOSF_BAR_SHIFT) |
110 if (__intel_wait_for_register_fw(uncore,
111 VLV_IOSF_DOORBELL_REQ, IOSF_SB_BUSY, 0,
112 10000, 0, NULL) == 0) {
114 *val = intel_uncore_read_fw(uncore, VLV_IOSF_DATA);
117 drm_dbg(&i915->drm, "IOSF sideband finish wait (%s) timed out\n",
118 is_read ? "read" : "write");
127 u32 vlv_punit_read(struct drm_i915_private *i915, u32 addr)
131 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
132 SB_CRRDDA_NP, addr, &val);
137 int vlv_punit_write(struct drm_i915_private *i915, u32 addr, u32 val)
139 return vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_PUNIT,
140 SB_CRWRDA_NP, addr, &val);
143 u32 vlv_bunit_read(struct drm_i915_private *i915, u32 reg)
147 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
148 SB_CRRDDA_NP, reg, &val);
153 void vlv_bunit_write(struct drm_i915_private *i915, u32 reg, u32 val)
155 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_BUNIT,
156 SB_CRWRDA_NP, reg, &val);
159 u32 vlv_nc_read(struct drm_i915_private *i915, u8 addr)
163 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_NC,
164 SB_CRRDDA_NP, addr, &val);
169 u32 vlv_iosf_sb_read(struct drm_i915_private *i915, u8 port, u32 reg)
173 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), port,
174 SB_CRRDDA_NP, reg, &val);
179 void vlv_iosf_sb_write(struct drm_i915_private *i915,
180 u8 port, u32 reg, u32 val)
182 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), port,
183 SB_CRWRDA_NP, reg, &val);
186 u32 vlv_cck_read(struct drm_i915_private *i915, u32 reg)
190 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
191 SB_CRRDDA_NP, reg, &val);
196 void vlv_cck_write(struct drm_i915_private *i915, u32 reg, u32 val)
198 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCK,
199 SB_CRWRDA_NP, reg, &val);
202 u32 vlv_ccu_read(struct drm_i915_private *i915, u32 reg)
206 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
207 SB_CRRDDA_NP, reg, &val);
212 void vlv_ccu_write(struct drm_i915_private *i915, u32 reg, u32 val)
214 vlv_sideband_rw(i915, PCI_DEVFN(0, 0), IOSF_PORT_CCU,
215 SB_CRWRDA_NP, reg, &val);
218 static u32 vlv_dpio_phy_iosf_port(struct drm_i915_private *i915, enum dpio_phy phy)
221 * IOSF_PORT_DPIO: VLV x2 PHY (DP/HDMI B and C), CHV x1 PHY (DP/HDMI D)
222 * IOSF_PORT_DPIO_2: CHV x2 PHY (DP/HDMI B and C)
224 if (IS_CHERRYVIEW(i915))
225 return phy == DPIO_PHY0 ? IOSF_PORT_DPIO_2 : IOSF_PORT_DPIO;
227 return IOSF_PORT_DPIO;
230 u32 vlv_dpio_read(struct drm_i915_private *i915, enum pipe pipe, int reg)
232 u32 port = vlv_dpio_phy_iosf_port(i915, DPIO_PHY(pipe));
235 vlv_sideband_rw(i915, DPIO_DEVFN, port, SB_MRD_NP, reg, &val);
238 * FIXME: There might be some registers where all 1's is a valid value,
239 * so ideally we should check the register offset instead...
241 drm_WARN(&i915->drm, val == 0xffffffff,
242 "DPIO read pipe %c reg 0x%x == 0x%x\n",
243 pipe_name(pipe), reg, val);
248 void vlv_dpio_write(struct drm_i915_private *i915,
249 enum pipe pipe, int reg, u32 val)
251 u32 port = vlv_dpio_phy_iosf_port(i915, DPIO_PHY(pipe));
253 vlv_sideband_rw(i915, DPIO_DEVFN, port, SB_MWR_NP, reg, &val);
256 u32 vlv_flisdsi_read(struct drm_i915_private *i915, u32 reg)
260 vlv_sideband_rw(i915, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRRDDA_NP,
265 void vlv_flisdsi_write(struct drm_i915_private *i915, u32 reg, u32 val)
267 vlv_sideband_rw(i915, DPIO_DEVFN, IOSF_PORT_FLISDSI, SB_CRWRDA_NP,