sdw_nread_no_pm(9)

💖 sdw_nread_no_pm(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one's all about sdw_nread_no_pm, and yes she's a kernel function living her best life in the soundwire bus code 🎀

---

✨ NAME ✨

sdw_nread_no_pm — literally reads "n" contiguous SDW Slave registers, and does it with no PM 🫶 (that's the whole personality, no cap)

---

🌈 SYNOPSIS 🌈

int sdw_nread_no_pm (struct sdw_slave *slave , u32 addr , size_t count ,
u8 *val );

---

🦋 ARGUMENTS 🦋

• slave — the SDW Slave, the main character of this operation 👑
• addr — the Register address, i.e. where we're looking 💅
• count — the length, so how many we're grabbing
• val — the Buffer for values to be read, where the good stuff lands 🍓

---

🌸 DESCRIPTION 🌸

okay so here's the tea, and it's lowkey important: if the message crosses a page boundary, each page gets transferred under a separate invocation of the msg_lock 😭 like it's not one big smooth operation, it's page-by-page, each one grabbing the lock on its own. fr fr, remember that.

---

⭐ SEE ALSO ⭐

Kernel file ./drivers/soundwire/bus.c — and the whole friend group show up here too, so go say hi 💖

• sdw_bus_master_add(9)
• sdw_bus_master_delete(9)
• sdw_transfer(9)
• sdw_show_ping_status(9)
• sdw_transfer_defer(9)
• sdw_nwrite_no_pm(9)
• sdw_write_no_pm(9)
• sdw_read_no_pm(9)
• sdw_nread(9)
• sdw_nwrite(9)
• sdw_read(9)
• sdw_write(9)
• sdw_bus_prep_clk_stop(9)
• sdw_bus_clk_stop(9)
• sdw_bus_exit_clk_stop(9)
• sdw_handle_slave_status(9)

---

💀 quick vibe check reminder: crossing a page boundary = multiple msg_lock invocations. Not me warning you twice, but also yes I am. 🫶

---

and that's the whole page bestie, you ate 💅 — this gem lives in ./drivers/soundwire, dated October 2026, and it's giving iconic kernel documentation energy 🧚‍♀️✨💜