mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 06:57:23 +07:00
49bb094332
Some Radeon cards have an I2C-based thermal sensor chip connected to the "monid" I2C bus. Set the I2C probing class of this bus properly so that hwmon drivers can detect devices on it and bind to them. This closes kernel.org bug #26172. We exclude PPC for the time being, as Benjamin doesn't want us to mess up with them without explicit testing, and there is no evidence that this change is needed for them either. Reported-by: Alexander Goomenyuk <emerg.reanimator@gmail.com> Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
#include "radeonfb.h"
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <asm/io.h>
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#include <video/radeon.h>
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#include "../edid.h"
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static void radeon_gpio_setscl(void* data, int state)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
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if (!state)
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val |= VGA_DDC_CLK_OUT_EN;
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OUTREG(chan->ddc_reg, val);
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(void)INREG(chan->ddc_reg);
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}
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static void radeon_gpio_setsda(void* data, int state)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
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if (!state)
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val |= VGA_DDC_DATA_OUT_EN;
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OUTREG(chan->ddc_reg, val);
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(void)INREG(chan->ddc_reg);
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}
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static int radeon_gpio_getscl(void* data)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg);
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return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
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}
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static int radeon_gpio_getsda(void* data)
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{
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struct radeon_i2c_chan *chan = data;
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struct radeonfb_info *rinfo = chan->rinfo;
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u32 val;
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val = INREG(chan->ddc_reg);
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return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
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}
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static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
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{
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int rc;
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snprintf(chan->adapter.name, sizeof(chan->adapter.name),
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"radeonfb %s", name);
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chan->adapter.owner = THIS_MODULE;
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chan->adapter.algo_data = &chan->algo;
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chan->adapter.dev.parent = &chan->rinfo->pdev->dev;
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chan->algo.setsda = radeon_gpio_setsda;
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chan->algo.setscl = radeon_gpio_setscl;
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chan->algo.getsda = radeon_gpio_getsda;
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chan->algo.getscl = radeon_gpio_getscl;
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chan->algo.udelay = 10;
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chan->algo.timeout = 20;
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chan->algo.data = chan;
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i2c_set_adapdata(&chan->adapter, chan);
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/* Raise SCL and SDA */
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radeon_gpio_setsda(chan, 1);
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radeon_gpio_setscl(chan, 1);
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udelay(20);
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rc = i2c_bit_add_bus(&chan->adapter);
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if (rc == 0)
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dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
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else
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dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
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return rc;
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}
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void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
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{
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rinfo->i2c[0].rinfo = rinfo;
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rinfo->i2c[0].ddc_reg = GPIO_MONID;
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#ifndef CONFIG_PPC
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rinfo->i2c[0].adapter.class = I2C_CLASS_HWMON;
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#endif
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radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
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rinfo->i2c[1].rinfo = rinfo;
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rinfo->i2c[1].ddc_reg = GPIO_DVI_DDC;
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radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
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rinfo->i2c[2].rinfo = rinfo;
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rinfo->i2c[2].ddc_reg = GPIO_VGA_DDC;
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radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
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rinfo->i2c[3].rinfo = rinfo;
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rinfo->i2c[3].ddc_reg = GPIO_CRT2_DDC;
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radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
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}
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void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
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{
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if (rinfo->i2c[0].rinfo)
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i2c_del_adapter(&rinfo->i2c[0].adapter);
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rinfo->i2c[0].rinfo = NULL;
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if (rinfo->i2c[1].rinfo)
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i2c_del_adapter(&rinfo->i2c[1].adapter);
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rinfo->i2c[1].rinfo = NULL;
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if (rinfo->i2c[2].rinfo)
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i2c_del_adapter(&rinfo->i2c[2].adapter);
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rinfo->i2c[2].rinfo = NULL;
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if (rinfo->i2c[3].rinfo)
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i2c_del_adapter(&rinfo->i2c[3].adapter);
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rinfo->i2c[3].rinfo = NULL;
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}
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int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
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u8 **out_edid)
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{
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u8 *edid;
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edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
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if (out_edid)
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*out_edid = edid;
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if (!edid) {
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pr_debug("radeonfb: I2C (port %d) ... not found\n", conn);
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return MT_NONE;
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}
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if (edid[0x14] & 0x80) {
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/* Fix detection using BIOS tables */
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if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
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(INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
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pr_debug("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
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return MT_LCD;
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} else {
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pr_debug("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
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return MT_DFP;
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}
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}
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pr_debug("radeonfb: I2C (port %d) ... found CRT display\n", conn);
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return MT_CRT;
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}
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