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Input updates for v6.11-rc5

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- a fix for Cypress PS/2 touchpad for regression introduced in 6.11
   merge window where timeout condition is incorrectly reported for
   all extended Cypress commands.
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Merge tag 'input-for-v6.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

Pull input fix from Dmitry Torokhov:

 - a fix for Cypress PS/2 touchpad for regression introduced in 6.11
   merge window where a timeout condition is incorrectly reported for
   all extended Cypress commands

* tag 'input-for-v6.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: cypress_ps2 - fix waiting for command response
This commit is contained in:
Linus Torvalds 2024-08-31 15:32:38 +12:00
commit 1934261d89
1 changed files with 13 additions and 45 deletions
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58
drivers/input/mouse/cypress_ps2.c
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@ -91,48 +91,6 @@ static int cypress_ps2_ext_cmd(struct psmouse *psmouse, u8 prefix, u8 nibble)
return rc;
}
static int cypress_ps2_read_cmd_status(struct psmouse *psmouse,
u8 cmd, u8 *param)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
enum psmouse_state old_state;
int pktsize;
int rc;
ps2_begin_command(ps2dev);
old_state = psmouse->state;
psmouse->state = PSMOUSE_CMD_MODE;
psmouse->pktcnt = 0;
pktsize = (cmd == CYTP_CMD_READ_TP_METRICS) ? 8 : 3;
memset(param, 0, pktsize);
rc = cypress_ps2_sendbyte(psmouse, PSMOUSE_CMD_GETINFO & 0xff);
if (rc)
goto out;
if (!wait_event_timeout(ps2dev->wait,
psmouse->pktcnt >= pktsize,
msecs_to_jiffies(CYTP_CMD_TIMEOUT))) {
rc = -ETIMEDOUT;
goto out;
}
memcpy(param, psmouse->packet, pktsize);
psmouse_dbg(psmouse, "Command 0x%02x response data (0x): %*ph\n",
cmd, pktsize, param);
out:
psmouse->state = old_state;
psmouse->pktcnt = 0;
ps2_end_command(ps2dev);
return rc;
}
static bool cypress_verify_cmd_state(struct psmouse *psmouse, u8 cmd, u8* param)
{
bool rate_match = false;
@ -166,6 +124,8 @@ static bool cypress_verify_cmd_state(struct psmouse *psmouse, u8 cmd, u8* param)
static int cypress_send_ext_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
{
u8 cmd_prefix = PSMOUSE_CMD_SETRES & 0xff;
unsigned int resp_size = cmd == CYTP_CMD_READ_TP_METRICS ? 8 : 3;
unsigned int ps2_cmd = (PSMOUSE_CMD_GETINFO & 0xff) | (resp_size << 8);
int tries = CYTP_PS2_CMD_TRIES;
int error;
@ -179,10 +139,18 @@ static int cypress_send_ext_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_BB(cmd));
cypress_ps2_ext_cmd(psmouse, cmd_prefix, DECODE_CMD_AA(cmd));
error = cypress_ps2_read_cmd_status(psmouse, cmd, param);
if (!error && cypress_verify_cmd_state(psmouse, cmd, param))
return 0;
error = ps2_command(&psmouse->ps2dev, param, ps2_cmd);
if (error) {
psmouse_dbg(psmouse, "Command 0x%02x failed: %d\n",
cmd, error);
} else {
psmouse_dbg(psmouse,
"Command 0x%02x response data (0x): %*ph\n",
cmd, resp_size, param);
if (cypress_verify_cmd_state(psmouse, cmd, param))
return 0;
}
} while (--tries > 0);
return -EIO;