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x86: tsc: Correct Silvermont reference clock values
Atom processors use a 19.2 MHz crystal oscillator. Early processors generate 100 MHz via 19.2 MHz * 26 / 5 = 99.84 MHz. Later processors generate 100 MHz via 19.2 MHz * 125 / 24 = 100 MHz. Update the Silvermont-based tables accordingly, matching the Software Developers Manual. Also, correct a 166 MHz entry that should have been 116 MHz, and add a missing 80 MHz entry for VLV2. This keeps in sync with Linux kernel commit: 05680e7: x86/tsc_msr: Correct Silvermont reference clock values Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
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@ -44,11 +44,11 @@ static struct freq_desc freq_desc_tables[] = {
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/* CLV+ */
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/* CLV+ */
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{ 6, 0x35, 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 } },
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{ 6, 0x35, 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 } },
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/* TNG - Intel Atom processor Z3400 series */
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/* TNG - Intel Atom processor Z3400 series */
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{ 6, 0x4a, 1, { 0, 99840, 133200, 0, 0, 0, 0, 0 } },
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{ 6, 0x4a, 1, { 0, 100000, 133300, 0, 0, 0, 0, 0 } },
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/* VLV2 - Intel Atom processor E3000, Z3600, Z3700 series */
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/* VLV2 - Intel Atom processor E3000, Z3600, Z3700 series */
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{ 6, 0x37, 1, { 83200, 99840, 133200, 166400, 0, 0, 0, 0 } },
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{ 6, 0x37, 1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 } },
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/* ANN - Intel Atom processor Z3500 series */
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/* ANN - Intel Atom processor Z3500 series */
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{ 6, 0x5a, 1, { 83200, 99840, 133200, 99840, 0, 0, 0, 0 } },
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{ 6, 0x5a, 1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 } },
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/* Ivybridge */
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/* Ivybridge */
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{ 6, 0x3a, 2, { 0, 0, 0, 0, 0, 0, 0, 0 } },
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{ 6, 0x3a, 2, { 0, 0, 0, 0, 0, 0, 0, 0 } },
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};
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};
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@ -99,7 +99,7 @@ static unsigned long __maybe_unused try_msr_calibrate_tsc(void)
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if (freq_desc_tables[cpu_index].msr_plat == 2) {
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if (freq_desc_tables[cpu_index].msr_plat == 2) {
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/* TODO: Figure out how best to deal with this */
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/* TODO: Figure out how best to deal with this */
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freq = 99840;
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freq = 100000;
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debug("Using frequency: %u KHz\n", freq);
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debug("Using frequency: %u KHz\n", freq);
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} else {
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} else {
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/* Get FSB FREQ ID */
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/* Get FSB FREQ ID */
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