5.15-stable review patch. If anyone has any objections, please let me know.
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From: Trevor Woerner twoerner@gmail.com
commit ee022e5cae052e0c67ca7c5fec0f2e7bc897c70e upstream.
The mapping table for the rk3328 is missing the entry for -25C which is found in the TRM section 9.5.2 "Temperature-to-code mapping".
NOTE: the kernel uses the tsadc_q_sel=1'b1 mode which is defined as: 4096-<code in table>. Whereas the table in the TRM gives the code "3774" for -25C, the kernel uses 4096-3774=322.
[Dragan Simic] : "After going through the RK3308 and RK3328 TRMs, as well as through the downstream kernel code, it seems we may have some troubles at our hands. Let me explain, please.
To sum it up, part 1 of the RK3308 TRM v1.1 says on page 538 that the equation for the output when tsadc_q_sel equals 1 is (4096 - tsadc_q), while part 1 of the RK3328 TRM v1.2 says that the output equation is (1024 - tsadc_q) in that case.
The downstream kernel code, however, treats the RK3308 and RK3328 tables and their values as being the same. It even mentions 1024 as the "offset" value in a comment block for the rk_tsadcv3_control() function, just like the upstream code does, which is obviously wrong "offset" value when correlated with the table on page 544 of part 1 of the RK3308 TRM v1.1.
With all this in mind, it's obvious that more work is needed to make it clear where's the actual mistake (it could be that the TRM is wrong), which I'll volunteer for as part of the SoC binning project. In the meantime, this patch looks fine as-is to me, by offering what's a clear improvement to the current state of the upstream code"
Link: https://opensource.rock-chips.com/images/9/97/Rockchip_RK3328TRM_V1.1-Part1-... Cc: stable@vger.kernel.org Fixes: eda519d5f73e ("thermal: rockchip: Support the RK3328 SOC in thermal driver") Signed-off-by: Trevor Woerner twoerner@gmail.com Reviewed-by: Dragan Simic dsimic@manjaro.org Link: https://lore.kernel.org/r/20250207175048.35959-1-twoerner@gmail.com Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/thermal/rockchip_thermal.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/thermal/rockchip_thermal.c +++ b/drivers/thermal/rockchip_thermal.c @@ -373,6 +373,7 @@ static const struct tsadc_table rk3328_c {296, -40000}, {304, -35000}, {313, -30000}, + {322, -25000}, {331, -20000}, {340, -15000}, {349, -10000},